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Jvc Lcd Lt-42dp8b Lt-42p80bg_p Chassis services manual
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SERVICE MANUAL
COPYRIGHT 2007 Victor Company of Japan, Limited No.YA5452007/8
INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISIONYA54520078SERVICE MANUAL
LT-42DP8BG/P,LT-42DP8BJ/P,LT-42P80BU/P
COPYRIGHT 2007 Victor Company of Japan, Limited
TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-114 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-175 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
BASIC CHASSIS
FL5
1-2 (No.YA545)
SPECIFICATION
Design & specifications are subject to change without notice.
ItemsContents
LT-42DP8BJ/P LT-42DP8BG/P LT-42P80BU/PDimensions ( W H D ) 103.0 cm 71.9 cm 29.6 cm [Included stand]
103.0 cm 67.2 cm 12.2 cm [TV only]Mass 28.5 kg [Included stand]
26.4 kg [TV only]28.0 kg [Included stand]25.9 kg [TV only]
Power Input AC220V - AC240 V, 50 HzPower Consumption 220 W (Standby: 0.5 W) 214 W (Standby: 0.5 W)TV RF System Analog CCIR (I) CCIR (B/G, I, D/K, L)
Digital DVB-T ---Colour System PAL, NTSC 3.58/4.43 [EXT only] PAL, SECAM, NTSC 3.58/4.43 [EXT only]Stereo System NICAM (I) NICAM (B/G, I, D/K, L), A2 (B/G, D/K)ReceivingFrequency
Analog UHF: 470 MHz - 862 MHz VHF: 47MHz - 470MHzUHF: 470 MHz - 862 MHzCATV: 116MHz - 172MHz / 220MHz - 469MHz
Digital UHF:470 MHz - 854 MHz UHF:174 MHz - 230 MHzUHF:470 MHz - 862 MHz
---
IntermediateFrequency
VIF 38.9MHz (I) 38.9MHz (B/G, I, D/K, L)SIF 32.9MHz (6.0MHz:I) 33.4MHz (5.5MHz:B/G)
32.9MHz (6.0MHz:I)32.4MHz (6.5MHz:D/K)
Colour SubCarrier Frequency
PAL 4.43MHzSECAM --- 4.40625MHz / 4.25MHz
NTSC 3.58MHz / 4.43MHzTeletext System Analog FLOF (Fastext level 2.5) /
WST(World Standard system)FLOF (Fastext level 2.5) / TOP / WST(World Standard system)
Digital MHEG 5 UK profile EBU TEXT ---LCD panel 42V-inch wide aspect (16 : 9) Screen Size Diagonal: 105 cm (H: 93.0 cm V: 52.3 cm) Display Pixels Horizontal: 1366 dots Vertical: 768 dots (W-XGA)Audio Power Output 10 W + 10 WSpeaker 5.5 cm 20.0 cm, oval type 2 (Oblique Cone)Aerial terminal (VHF/UHF) 75 unbalanced, coaxialEXT-1 / EXT-2 (Input / Output) 21-pin Euro connector (SCART socket ) 2EXT-3 (Input) S-Video Mini-DIN 4 pin 1
Y: 1 V (p-p), Positive (Negative sync provided), 75 C: 0.286 V (p-p) (Burst signal), 75
Video 1 V (p-p), Positive (Negative sync provided), 75 , RCA pin jack 1Audio 500 mV (rms), High impedance, RCA pin jack 2
EXT-4 (Input) Component Video750p / 1125i
625p / 525p / 625i / 525i
RCA pin jack 3Y: 1 V (p-p) (Sync signal: 0.35V(p-p), 3-value sync.), 75 / Pb/Pr: 0.35V(p-p), 75 Y: 1 V (p-p), Positive (Negative sync.), 75 / Cb/Cr: 0.7V(p-p), 75
Audio 500 mV(rms) (-4dBs), high impedance, RCA pin jack 2Digital input[DIGITAL-IN 1/2]
Video / Audio HDMI 2-row 19pin connector 2(Digital-input terminal is not compatible with picture signals of personal computer)
PC (RGB) Input D-sub 3-row 15pin 1R/G/B : 0.7V (p-p), 75HD / VD : 1V (p-p) to 5V (p-p), high impedance< Available signal >VGA : 640 pixels 480 pixels (Horizontal : 31.5kHz / Vertical : 60Hz)XGA : 1024 pixels 768 pixels (Horizontal : 48.4kHz / Vertical : 60Hz)
Audio Output 500 mV (rms), Low impedance, RCA pin jack 2Digital Audio Optical Output Digital SPDIF 1 ---Headphone 3.5 mm stereo mini jack 1Remote Control Unit RM-C1911 (AA/R6 dry cell battery 2) RM-C1910 (AA/R6 dry cell battery 2)
(No.YA545)1-3
SECTION 1PRECAUTION
1.1 SAFETY PRECAUTIONS [EXCEPT FOR UK](1) The design of this product contains special hardware,
many circuits and components specially for safetypurposes. For continued protection, no changes should bemade to the original design unless authorized in writing bythe manufacturer. Replacement parts must be identical tothose used in the original circuits. Service should beperformed by qualified personnel only.
(2) Alterations of the design or circuitry of the products shouldnot be made. Any design alterations or additions will voidthe manufacturer's warranty and will further relieve themanufacturer of responsibility for personal injury orproperty damage resulting therefrom.
(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. Thesecharacteristics are often not evident from visual inspectionnor can the protection afforded by them necessarily beobtained by using replacement components rated forhigher voltage, wattage, etc. Replacement parts whichhave these special safety characteristics are identified inthe parts list of Service manual. Electrical componentshaving such features are identified by shading on theschematics and by ( ) on the parts list in Servicemanual. The use of a substitute replacement which doesnot have the same safety characteristics as therecommended replacement part shown in the parts list ofService manual may cause shock, fire, or other hazards.
(4) Don't short between the LIVE side ground andISOLATED (NEUTRAL) side ground or EARTH sideground when repairing. Some model's power circuit is partly different in the GND.The difference of the GND is shown by the LIVE : ( ) sideGND, the ISOLATED (NEUTRAL) : ( ) side GND andEARTH : ( ) side GND. Don't short between the LIVE side GND and ISOLATED(NEUTRAL) side GND or EARTH side GND and nevermeasure the LIVE side GND and ISOLATED (NEUTRAL)side GND or EARTH side GND at the same time with ameasuring apparatus (oscilloscope etc.). If above note willnot be kept, a fuse or any parts will be broken.
(5) When service is required, observe the original lead dress.Extra precaution should be given to assure correct leaddress in the high voltage circuit area. Where a short circuithas occurred, those components that indicate evidence ofoverheating should be replaced. Always use themanufacturer's replacement components.
(6) Isolation Check (Safety for Electrical Shock Hazard) After re-assembling the product, always perform anisolation check on the exposed metal parts of the cabinet(antenna terminals, video/audio input and output terminals,Control knobs, metal cabinet, screw heads, earphone jack,control shafts, etc.) to be sure the product is safe to operatewithout danger of electrical shock.
a) Dielectric Strength Test The isolation between the AC primary circuit and all metalparts exposed to the user, particularly any exposed metalpart having a return path to the chassis should withstand avoltage of 3000V AC (r.m.s.) for a period of one second. (.. . . Withstand a voltage of 1100V AC (r.m.s.) to anappliance rated up to 120V, and 3000V AC (r.m.s.) to anappliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generallyfound in the service trade.
b) Leakage Current Check Plug the AC line cord directly into the AC outlet (do not usea line isolation transformer during this check.). Using a"Leakage Current Tester", measure the leakage currentfrom each exposed metal part of the cabinet, particularlyany exposed metal part having a return path to the chassis,to a known good earth ground (water pipe, etc.). Anyleakage current must not exceed 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC(r.m.s.). Alternate Check Method
Plug the AC line cord directly into the AC outlet (do notuse a line isolation transformer during this check.). Usean AC voltmeter having 1000 per volt or moresensitivity in the following manner. Connect a 150010W resistor paralleled by a 0.15F AC-type capacitorbetween an exposed metal part and a known good earthground (water pipe, etc.). Measure the AC voltageacross the resistor with the AC voltmeter. Move theresistor connection to each exposed metal part,particularly any exposed metal part having a return pathto the chassis, and measure the AC voltage across theresistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Any voltage measured mustnot exceed 0.75V AC (r.m.s.). This corresponds to0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART1500 10W
0.15 F AC-TYPE
GOOD EARTH GROUND
1-4 (No.YA545)
1.2 SAFETY PRECAUTIONS [FOR UK](1) The design of this product contains special hardware and many circuits and components specially for safety purposes. For
continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer.Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnelonly.
(2) Alterations of the design or circuitry of the product should not be made. Any design alterations or additions will void themanufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damageresulting therefrom.
(3) Many electrical and mechanical parts in the product have special safety-related characteristics. These characteristics are oftennot evident from visual inspection nor can the protection afforded by them necessary be obtained by using replacementcomponents rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics areidentified in the Parts List of Service Manual. Electrical components having such features are identified by shading on theschematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have thesame safety characteristics as the recommended replacement part shown in the Parts List of Service Manual may cause shock,fire, or other hazards.
(4) The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts,high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service isrequired, the original lead routing and dress should be observed, and it should be confirmed that they have been returned tonormal, after re-assembling.
WARNING(1) The equipment has been designed and manufactured to meet international safety standards.(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.(3) Repairs must be made in accordance with the relevant safety standards.(4) It is essential that safety critical components are replaced by approved parts.(5) If mains voltage selector is provided, check setting for local voltage.
(No.YA545)1-5
1.3 INSTALLATION1.3.1 HEAT DISSIPATIONIf the heat dissipation vent behind this unit is blocked, coolingefficiency may deteriorate and temperature inside the unit willrise. The temperature sensor that protects the unit will beactivated when internal temperature exceeds the pre-determinedlevel and power will be turned off automatically.Therefore,please make sure pay attention not to block the heat dissipationvent as well as the ventilation outlet behind the unit and ensurethat there is room for ventilation around it.
1.3.2 INSTALLATION REQUIREMENTSEnsure that the minimal distance is maintained, as specifiedbelow, between the unit with and the surrounding walls, as wellas the floor etc.Install the unit on stable flooring or stands.Takeprecautionary measures to prevent the unit from tipping in orderto protect against accidents and earthquakes.
1.3.3 INSTALLATION REQUIREMENTSTo ensure safety in an emergency such as an earthquake, andto prevent accidents, ensure that measures are taken to preventthe TV dropping or falling over.
1.3.4 NOTES ON HANDLINGWhen taking the unit out of a packing case, do not grasp theupper part of the unit. If you take the unit out while grasping theupper part, the LCD PANEL may be damaged because of apressure. Instead of grasping the upper part, put your hands onthe lower backside or sides of the unit.
1.4 HANDLING LCD PANEL1.4.1 PRECAUTIONS FOR TRANSPORTATIONWhen transporting the unit, pressure exerted on the internal LCDpanel due to improper handling (such as tossing and dropping)may cause damages even when the unit is carefully packed. Toprevent accidents from occurring during transportation, paycareful attention before delivery, such as through explaining thehandling instructions to transporters.Ensure that the following requirements are met duringtransportation, as the LCD panel of this unit is made of glass andtherefore fragile:
(1) USE A SPECIAL PACKING CASE FOR THE LCD PANELWhen transporting the LCD panel of the unit, use a specialpacking case (packing materials). A special packing caseis used when a LCD panel is supplied as a service sparepart.
(2) ATTACH PROTECTION SHEET TO THE FRONTSince the front (display part) of the panel is vulnerable,attach the protection sheet to the front of the LCD panelbefore transportation. Protection sheet is used when a LCDpanel is supplied as a service spare part.
(3) AVOID VIBRATIONS AND IMPACTSThe unit may be broken if it is toppled sideways even whenproperly packed. Continuous vibration may shift the gap ofthe panel, and the unit may not be able to display imagesproperly. Ensure that the unit is carried by at least 2persons and pay careful attention not to exert any vibrationor impact on it.
(4) DO NOT PLACE EQUIPMENT HORIZONTALLYEnsure that it is placed upright and not horizontally duringtransportation and storage as the LCD panel is veryvulnerable to lateral impacts and may break. Duringtransportation, ensure that the unit is loaded along thetraveling direction of the vehicle, and avoid stacking themon one another. For storage, ensure that they are stackedin 2 layers or less even when placed upright.
Ventilation hole
*Diagram differs from actual appearance.
*Diagram differs from actual appearance.
200 mm
150 mm 50 mm 150 mm 50 mm
It fixes in a band.
TV STAND
*Diagram differs from actual appearance.
1-6 (No.YA545)
1.4.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)(1) Avoid placing the unit under direct sunlight over a
prolonged period of time. This may cause the optical filterto deteriorate in quality and COLOUR.
(2) Clean the filter surface by wiping it softly and lightly with asoft and lightly fuzz cloth (such as outing flannel).
(3) Do not use solvents such as benzene or thinner to wipe thefilter surface. This may cause the filter to deteriorate inquality or the coating on the surface to come off. Whencleaning the filter, usually use the neutral detergent dilutedwith water. When cleaning the dirty filter, use water-dilutedethanol.
(4) Since the filter surface is fragile, do not scratch or hit it withhard materials. Be careful enough not to touch the frontsurface, especially when taking the unit out of the packingcase or during transportation.
1.4.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIORPARTS
Take note of the following when replacing exterior parts (REARCOVER, FRONT PANEL, etc.):
(1) Do not exert pressure on the front of the LCD panel (filtersurface). It may cause irregular COLOUR.
(2) Pay careful attention not to scratch or stain the front of theLCD panel (filter surface) with hands.
(3) When replacing exterior parts, the front (LCD panel) shouldbe placed facing downward. Place a mat, etc. underneathto avoid causing scratches to the front (filter surface).
1.4.4 HOW TO CHECK THE OPERATING TIME This model has a function to count and record the LCD paneloperating time. The operating time can be checked in thefollowing procedure. Maximum count time = 131070 hours
(1) Press the [INFORMATION] key and [MUTING] key simul-taneously, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [2] key to enterthe self check mode.
(3) The operating time of the LCD panel is displayed in 5-digitdecimal number.(Refer to the below figure)
1.4.5 HOW TO RESET THE OPERATING TIME(1) Press the [MENU] key simultaneously, then enter the
USER MENU.(2) Select the "Features" from the USER MENU.(3) Select the Blue back from the Features.(4) Set the Blue back to Off.(5) Press the [INFORMATION] key and [MUTING] key
simultaneously, then enter the SERVICE MODE.(6) When the Main Menu is displayed, press [2] key to enter
the self check mode.(7) When the self check screen(page-1) is displayed, press
[ZOOM] key.(8) "RESET : OK" is displayed under the operating time.(9) Press the [TV] key to reset the operating time.
NOTE:When the LCD PANEL UNIT is replaced, be sure to reset theoperating time following the above method.
SELF CHECK MODE SCREEN (Page 1)
SERVICE MENUSERVICE MENU
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
LOB 0 FAN 0LOB 0 FAN 0
AUD 0 AUD 0
ANA 9 DIG 9ANA 9 DIG 9
HOUR 131070 MAX 0HOUR 131070 MAX 0
RESET : OK 1RESET : OK 1
The operating time is displayed
MAX is displayed when the maximumcount time is exceeded
Switch the display/ non-display
with the [ZOOM] key.
Press [2] key
SERVICE MODE SCREEN
*When the power is turned off with the remote control unit or the power
button of the main unit, the count restarts from the turn off time.
*When the power is turned off by disconnecting the power cord from the
AC outlet, the recorded time count less than 2 hours is not counted.
*When the operating time exceeds the maximum count time, "MAX" is
displayed to the right of the counted time, and the following count is
discontinued.
(No.YA545)1-7
SECTION 2SPECIFIC SERVICE INSTRUCTIONS
2.1 SYSTEM SETTING
(1) Press the [INFORMATION] key and [MUTING] keysimultaneously, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [2] key to enterthe self check mode.
(3) Turn off the power by pressing the [POWER] key on theremote control unit.
2.2 FEATURES100Hz Clear Motion Drive
This function is able to display twice as many frames as aconventional LCD display.
DIGITAL TUNER [LT-42DP8 series only]This TV can receive both DVB-T (Digital terrestrial broadcasting)and Analogue terrestrial broadcasting.
D.I.S.T. (Digital Image Scaling Technology)This system uses line interpolation to double the number ofscanning lines and achieve high resolution, flicker-free picture.
Colour ManagementThis function ensures dull colours are compensated toproduce natural hues.
Picture ManagementThis function makes it easier to see the dark areas when apicture has many dark areas, and makes it easier to see thebright areas when a picture has many bright areas.
Smart PictureThis function detects the APL (Average Picture Level) andadjusts the contrast suitable for what you are watching.
DIGITAL VNRThis function cuts down the amount of noise in the originalpicture.
MPEG Noise Reduction This function effects the block noise removal and mosquito NRsimultaneously.
MaxxAudioMaxxAudio improves sound performance with four soundfeatures (MaxxBass, MaxxTreble, MaxxStereo andMaxxVolume).
2.3 MAIN DIFFERENCE LIST
Be sure to carry out the following operation at the end ofthe procedure.
SERVICE MODE SCREEN
SELF CHECK MODE SCREEN (Page 1)
SERVICE MENUSERVICE MENU
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
LOB 0 FAN 0LOB 0 FAN 0
AUD 0 AUD 0
ANA 9 DIG 9ANA 9 DIG 9
HOUR 131070 MAX 0HOUR 131070 MAX 0
RESET : OK 1RESET : OK 1
Press [2] key
Item LT-42DP8BJ/P LT-42DP8BG/P LT-42P80BU/PDigital Tuner YES NO
Teletext (Digital) MHEG 5 UK profile EBU TEXT NO
Indoor ANT Power Supply YES NO
Digital Audio Optical Output YES NO
Remote Control Unit RM-C1911 RM-C1910
1-8 (No.YA545)
2.4 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2
(P-P= Peak to Peak, B-W= Blanking to white peak)
Pin No. Signal designation Matching value EXT-1 EXT-21 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2)
3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
4 AUDIO GND Used Used
5 GND (B) Used Used
6 AUDIO L input 500mV(rms) (Nominal), High impedance Used (L1) Used (L2)
7 B input 700mV(B-W), 75 Used Used8 FUNCTION SW
(SLOW SW)Low : 0V-3VHigh : 8V-12V, High impedance
Used Used
9 GND (G) Used Used
10 SCL / T-V LINK Not used Used (SCL2 / TV-LINK)
11 G input 700mV(B-W), 75 Used Used12 SDA Not used Used (SDA2)
13 GND (R) Used Used
14 GND (YS) Used Not used
15 R / C input R : 700mV(B-W), 75 C : 300mV(P-P), 75
Used (C1/R) Used (C2/R)
16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75 Used Used17 GND (VIDEO output) Used Used
18 GND (VIDEO input) Used Used
19 VIDEO output 1V(P-P) (Negative sync), 75 Used (TV OUT) Used (LINE OUT)20 VIDEO / Y input 1V(P-P) (Negative sync), 75 Used (Y1/V) Used (Y2/V)21 COMMON GND Used Used
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
[Pin assignment]
(No.YA545)1-9
2.5 TECHNICAL INFORMATION2.5.1 LCD PANELThis unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of theconventional CRT (Cathode Ray Tube), as a display unit.Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where lightdoes not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.
2.5.1.1 SPECIFICATIONSThe following table shows the specifications of this unit.
2.5.1.2 PIXEL FAULTThere are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.
BRIGHT FAULTIn this pixel fault, a cell that should not light originally is lighting on and off.For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.
DARK FAULTIn this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting.For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.
FLICKER FAULTIn the pixel fault, a cell that should light originally or not light originally is flashing on and off.For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing onand off.
Item SpecificationsMaximum dimensions ( W H D ) 98.3 cm 57.6 cm 5.2 cm
Weight 15.0 kg
Effective screen size Diagonal: 1050 mm (H: 930.25 mm V: 523.01 mm)
Aspect ratio 16 : 9
Drive device / system a-Si-TFT active matrix system
Resolution Horizontally 1366 Vertically 768 RGB 3147264 dots in total
Pixel pitch (pixel size) Horizontally: 0.681 mm, Vertically: 0.681 mm
Displayed colour 16777216 colours 256 colours for R G and B
Brightness 500cd/m2
Contrast ratio 1500 : 1
Response time (Tr) less than 8 ms
View angle (Horizontally) 178
View angle (Vertically) 178
Surface polarizer Anti-Glare type Low reflective coat
Colour filter Vertical stripe
Backlight Cold cathode fluorescent lamp 20
Power supply voltage in LCD 12 V
Power supply voltage in inverter 24 V
Panel interface system LVDS (Low Voltage Differential Signaling)
1-10 (No.YA545)
2.5.2 MAIN CPU PIN FUNCTION [IC7301 : DIGITAL PWB]Pin Pin name I/O Function Pin Pin name I/O Function 1 TCK O Test purpose 65 D2 I/O Program ROM data for main CPU2 TMS I Test purpose 66 D12 I/O Program ROM data for main CPU3 TDI I Test purpose 67 D10 I/O Program ROM data for main CPU4 TDO O Test purpose 68 VSS33 - GND5 P2.8 I Input for HDMI CEC 69 VDD33 I 3.3V6 P2.9 O Blue for OSD 70 D4 I/O Program ROM data for main CPU7 P2.10 O Blue for OSD 71 D3 I/O Program ROM data for main CPU8 P2.11 O Blue for OSD 72 D11 I/O Program ROM data for main CPU9 P2.12 O Blue for OSD 73 RSTIN I Reset10 P2.13 O Blue for OSD 74 POWER O Sleep state release for chassis CPU [Release : L]11 P2.14 I TV-LINK data 75 P3.1 O Reset for digital tuner unit12 P2.15 O Request for chassis CPU communication 76 REMOCON I Remote control13 VSS33 - GND 77 P3.3 I Clock for OSD14 VDD33 I 3.3V 78 P3.4 O Red for OSD15 P4.5 O TV-LINK data 79 P3.5 O Red for OSD16 A20 O Program ROM address for main CPU 80 P3.6 O Red for OSD17 A19 O Program ROM address for main CPU 81 P3.7 O Red for OSD18 A18 O Program ROM address for main CPU 82 MTST I/O Data transmission for chassis CPU communication19 A17 O Program ROM address for main CPU 83 MTSR I/O Data receive for chassis CPU communication20 VSS25 - GND 84 VSS33 - GND21 VDD25 I 2.5V 85 VDD33 I 3.3V22 A16 O Program ROM address for main CPU 86 VSS25 - GND23 A8 O Program ROM address for main CPU 87 VDD25 I 2.5V24 A7 O Program ROM address for main CPU 88 TXD0 I/O Data transmission for digital tuner unit25 A9 O Program ROM address for main CPU 89 RXD0 I/O Data receive for digital tuner unit26 A6 O Program ROM address for main CPU 90 P3.12 O Red for OSD27 A5 O Program ROM address for main CPU 91 CLK O Clock for chassis CPU communication28 A10 O Program ROM address for main CPU 92 P3.15 O Output for HDMI CEC29 A11 O Program ROM address for main CPU 93 P5.14 O Green for OSD30 A12 O Program ROM address for main CPU 94 P5.15 O Green for OSD31 VSS33 - GND 95 TRIG_IN O Green for OSD32 VDD33 I 3.3V 96 TRIG_OUT O Green for OSD33 A4 O Program ROM address for main CPU 97 P6.2 O Green for OSD34 A3 O Program ROM address for main CPU 98 P6.3 I/O I2C bus clock (for main memory)35 A2 O Program ROM address for main CPU 99 P6.4 I/O I2C bus Data (for main memory)36 A1 O Program ROM address for main CPU 100 P6.5 O Sync signal select for OSD / Teletext37 A0 O Program ROM address for main CPU 101 IRQ O Interrupt request for digital tuner unit38 A13 O Program ROM address for main CPU 102 VSYNC I Vertical sync39 ARAS/A14 O Program ROM address for main CPU 103 HSYNC I Horizontal sync40 CAS/A15 O Program ROM address for main CPU 104 COR/RSTOUT O Not used41 VSS33 - GND 105 BLANK O Ys for OSD / Teletext42 VDD33 I 3.3V 106 VDD33 I 3.3V43 MEMCLK O Clock for memory 107 VSS33 - GND44 CSSDRAM O Chip select for memory 108 XTAL1 I 6MHz for system clock45 CLKEN O Clock enable for memory 109 XTAL2 O 6MHz for system clock46 CSROM O Chip select for memory 110 VSSA - GND47 RD O Read for memory 111 VDDA I 2.5V48 UDQM O Control buffer of memory 112 R O R for Teletext49 LDQM O Control buffer of memory 113 G O G for Teletext50 WR O Write for memory 114 B O B for Teletext51 D15 I/O Program ROM data for main CPU 115 VSSA - GND52 VSS33 - GND 116 VDDA I 2.5V53 VDD33 I 3.3V 117 CVBS2 I Not used54 D7 I/O Program ROM data for main CPU 118 VSSA - GND55 D0 I/O Program ROM data for main CPU 119 VDDA I 2.5V56 D14 I/O Program ROM data for main CPU 120 CVBS1B I Not used57 D8 I/O Program ROM data for main CPU 121 CVBS1A I Video for Teletext58 D6 I/O Program ROM data for main CPU 122 VSSA - GND59 D1 I/O Program ROM data for main CPU 123 VDDA I 2.5V60 VSS33 - GND 124 KEY1 I Key scan data 1 [ON : H]61 VDD33 I 3.3V 125 KEY2 I Key scan data 2 [ON : H]62 D13 I/O Program ROM data for main CPU 126 MECA_SW I Main power ON / OFF control [ON : L]63 D9 I/O Program ROM data for main CPU 127 (KEYP2)P5.3 I Error detection for digital tuner unit64 D5 I/O Program ROM data for main CPU 128 TMODE I Test purpose
(No.YA545)1-11
SECTION 3DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE Be sure to perform the SYSTEM SETTING, at the end of the procedure. Make sure that the power cord is disconnected from the outlet. Pay special attention not to break or damage the parts. Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.
REFERENCE:When removing each board, remove the connector if necessary. The operation is easier if you write down the connection points(connector numbers) of the connector. For connection of each board, refer to the "WIRING DIAGRAM" of the Standard CircuitDiagram.
3.1.1 REMOVING THE REAR COVER (Fig.3-1)(1) Remove the 1 screw [A].(2) Remove the POWER CORD COVER.(3) Remove the POWER CORD.(4) Remove the 10 screws [B], 4 screws [C], 5 screws [D], 2
screws [E] and 1 screw [F].(5) Remove the REAR COVER.
3.1.2 REMOVING THE ANALOG PWB (Fig.3-1) Remove the REAR COVER.
(1) Remove the 1 screw [G].(2) Remove the TUNER BASE.(3) Remove the 3 hooks [a], 2 screws [H] and 3 screws [I].(4) Remove the TERMINAL BASE.(5) Remove the 5 screws [J] and 2 screws [K].(6) Remove the ANALOG PWB.
3.1.3 REMOVING THE DC-DC PWB (Fig.3-1) Remove the REAR COVER.
(1) Remove the 2 screws [L].(2) Remove the DC-DC PWB.
3.1.4 REMOVING THE POWER PWB (Fig.3-1) Remove the REAR COVER.
(1) Remove the 11 screws [M].(2) Remove the POWER PWB.
3.1.5 REMOVING THE SW PWB (Fig.3-1) Remove the REAR COVER.
(1) Remove the 2 screws [N].(2) Remove the CONTROL KNOB with SW PWB.(3) Remove the 2 screws [O].(4) Remove the SW PWB from the CONTROL KNOB.
3.1.6 REMOVING THE DIGITAL TUNER UNIT[LT-42DP8 series only] (Fig.3-1)
Remove the REAR COVER.(1) Remove the 9 hooks [b].(2) Remove the SHIELD COVER.(3) Remove the 2 screws [P], 2 screws [Q] and 2 screws [R].(4) Remove the SHIELD TERMINAL.(5) Remove the 4 screws [S].(6) Remove the DIGITAL TUNER UNIT.
3.1.7 REMOVING THE DIGITAL PWB (Fig.3-1) Remove the REAR COVER. Remove the SHIELD COVER. Remove the SHIELD TERMINAL. Remove the DIGITAL TUNER UNIT. [LT-42DP8 series only]
(1) Remove the 7 screws [T].(2) Remove the DIGITAL PWB BRACKET.
[LT-42DP8 series only](3) Remove the 2 screws [U].(4) Remove the DIGITAL PWB.
CAUTION :Make sure to perform the "SYSTEM SETTING", whenDIGITAL PWB is replaced.
3.1.8 REMOVING THE SPEAKER (Fig.3-1) Remove the REAR COVER.
(1) Remove the 2 screws [V].(2) Remove the SPEKAER.(3) Follow the same steps when removing the other hand
SPEAKER.
3.1.9 REMOVING THE STAND ASS'Y (Fig.3-1)(1) Remove the 1 screw [F] and 4 screws [W].(2) Remove the STAND ASS'Y.
3.1.10 REMOVING THE LED PWB (Fig.3-1) Remove the REAR COVER. Remove the STAND ASS'Y.
(1) Remove the 5 screws [X] and 2 screws [Y].(2) Remove the STAND BASE SUPPORT.(3) Remove the 2 screws [Z] and 2 hooks [c].(4) Remove the LED PWB.
3.1.11 REMOVING THE LCD PANEL UNIT (Fig.3-1) Remove the REAR COVER. Remove the STAND ASS'Y. Remove the STAND BASE SUPPROT. Remove the SPEKAER.
(1) Remove the 4 screws [AA], 4 screws [AB] and 4 screws[AC].
(2) Remove the MAIN BASE.(3) Remove the LCD PANEL UNIT from the FRONT PANEL.
1-12 (No.YA545)
Fig.3-1
STAND BASE
SUPPORT
MAIN BASE
DIGITAL PWB BRACKET
SHIELD COVER
M
U
S
T
P
R
Q
AC
AC
AC
AA
GAA
X
Y
V
AB
J
B
B
B
D
A
D
F
E
C
H
NO
N
AC
AB
L
K
I
L
W
V
Z
REAR COVER
STAND ASS'Y
POWER CORD
POWER CORD COVER
ANALOG PWB
DC-DC PWB
POWER PWB
TERMINAL
BASE
DIGITAL TUNER UNIT
SHIELD TERMINAL
DIGITAL PWB
TUNER BASE
b
c
SPEAKER
SPEAKER
LED PWB
LCD PANEL UNIT
SW PWB
FRONT PANEL
CONTROL
KNOB
The illustration is LT-42DP8 series
a
(No.YA545)1-13
3.1.12 REMOVING THE LCD CONTROL PWB (Fig.3-2) Remove the REAR COVER. Remove the STAND ASS'Y. Remove the STAND BASE SUPPROT. Remove the MIAN BASE.
(1) Remove the 4 screws [A].(2) Remove the LCD CONTROL PWB COVER.(3) Remove the LCD CONTROL PWB.
3.1.13 REMOVING THE INVERTER PWB (Fig.3-2) Remove the REAR COVER.
(1) Remove the 5 screws [B].(2) Remove the INVERTER PWB COVER.(3) Remove the INVERTER PWB.(4) Follow the same steps when removing the other hand
INVERTER PWB.
Fig.3-2
FRONT
LCD CONTROL PWB COVER
INVERTER PWB(MASTER)
COVER
INVERTER PWB(SLAVE)
COVER
B
A
B
LCD CONTROL PWB
INVERTER PWB(SLAVE)
INVERTER PWB(MASTER)
1-14 (No.YA545)
3.2 MEMORY IC REPLACEMENT This model uses the memory IC. This memory IC stores data for proper operation of the video and drive circuits. When replacing, be sure to use an IC containing this (initial value) data.
3.2.1 MEMORY IC TABLE
3.2.2 MEMORY IC REPLACEMENT PROCEDURE1. Power off
Switch off the power and disconnect the power plug from the AC outlet.
2. Replace the memory ICBe sure to use the memory IC written with the initial setting values.
3. Power onConnect the power plug to the AC outlet and switch on the power.
4. Receiving channel settingRefer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.
5. User settingCheck the user setting items according to the given in page later. Where these do not agree, refer to the OPERATINGINSTRUCTIONS and set the items as described.
6. SERVICE MODE settingVerify what to set in the SERVICE MODE, and set whatever is necessary (Fig.3-3). Refer to the SERVICE ADJUSTMENT for setting.
3.2.3 SERVICE MODE SETTINGSERVICE MODE SCREEN
Fig.3-3
SETTING ITEM
3.2.4 SETTINGS OF FACTORY SHIPMENT3.2.4.1 BUTTON OPERATION
3.2.4.2 REMOTE CONTROL DIRECT OPERATION
Symbol Number of pins Mounting PWB Main content of dataIC7201 48-pin DIGITAL PWB Program (Video process) of IC6001(System CPU) is memorized.
IC7602 8-pin DIGITAL PWB Setting value of IC7301(MAIN CPU) is memorized.
Setting items Settings Item No.Video system setting Adjust S001 - S009
(Not used) Fixed T001 - T003(Not used) Fixed M001 - M224(Not used) Fixed F001 - F002(Not used) Fixed D001 (Not used) Fixed Z001
MAIN MENU SCREEN
ADJUSTMENT MODE SCREEN
SERVICE MENUSERVICE MENU
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
S001 R DRIVE 137S001 R DRIVE 137
PAL50 FULL STD HPAL50 FULL STD H
Setting item Setting positionPOWER Off
CHANNEL PR1
VOLUME 10
TV/AV TV
Setting item Setting positionCHANNEL PR1
VOLUME 10
ZOOM Auto
SUB PICTURE EXT-1
SUB POWER Off
(No.YA545)1-15
3.2.4.3 REMOTE CONTROL MENU OPERATION(1) PICTURE
(2) SOUND
(3) FEATURES
(4) SET UP
(5) DTV [LT-42DG8 series only][For UK]
[For other country]
*It differs according to the language that the user selected.
[For All country]
Setting item Setting positionPicture Mode Bright
Colour Temp. Cool
FeaturesSuper Digipure Auto
Movie Theatre Auto
Colour Management On
Picture Management On
Smart Picture On
MPEG Noise Reduction Off
Colour System Main Depends PR
Sub Auto
4:3 Auto Aspect Panoramic
Setting item Setting positionStereo / Iii Stereo Sound
MaxxAudio Low
Balance Centre
Voice Enhancer Off
Setting item Setting positionSleep Timer Off
Child Lock Off (ID:0000)
Appearance Type A
Blue Back On
Favorite Setting Blank
Illumination Bright
Power Lamp On
Eco Mode Off
Setting item Setting positionAuto Program Tv Channel Automatically Set
Edit/manual -
Language English
Decoder (Ext-2) Off
Component Auto Select Off
HDMI HDMI CEC: OnSize: AutoAudio: Auto
Attenuator Off
PC Position Centre
Auto Demonstration Off
Ext SettingS-IN Blank
ID Blank
Dubbing Ext-1 Ext-2
Setting item Setting positionConfigurationAudio Language EnglishSubtitle Language EnglishFavourite Mode OffMenu Lock Disable
Setting item Setting positionConfigurationCountry --- *Menu Language --- *Audio Language --- *Subtitle Language --- *Teletext Language --- *EPG Language --- *Enter PIN Code 0000Favourite Mode OffMaturity Rating Off
Setting item Setting positionSetupDigital Audio Output PCMBanner Duration 2secReceiver Upgrade AutoCommon Interface ---Antenna Power Off
1-16 (No.YA545)
3.3 REPLACEMENT OF CHIP COMPONENT3.3.1 CAUTIONS
(1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern.(3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it.
3.3.2 SOLDERING IRON(1) Use a high insulation soldering iron with a thin pointed end of it. (2) A 30w soldering iron is recommended for easily removing parts.
3.3.3 REPLACEMENT STEPS 1. How to remove Chip parts
[Resistors, capacitors, etc.]
(1) As shown in the figure, push the part with tweezers andalternately melt the solder at each end.
(2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply extra solder to each lead.
(2) As shown in the figure, push the part with tweezers andalternately melt the solder at each lead. Shift and removethe chip part.
NOTE :After removing the part, remove remaining solder from thepattern.
2. How to install Chip parts
[Resistors, capacitors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on thesolder. Then heat and melt the solder at both ends of thechip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply solder to the pattern as indicated in the figure. (2) Grasp the chip part with tweezers and place it on the
solder. (3) First solder lead A as indicated in the figure.
(4) Then solder leads B and C.
SOLDER SOLDER
A
B
C
A
B
C
(No.YA545)1-17
SECTION 4ADJUSTMENT
4.1 ADJUSTMENT PREPARATION(1) There are 2 ways of adjusting this TV : One is with the
REMOTE CONTROL UNIT and the other is theconventional method using adjustment parts andcomponents.
(2) The adjustment using the REMOTE CONTROL UNIT ismade on the basis of the initial setting values. Thesetting values which adjust the screen to the optimumcondition can be different from the initial settingvalues.
(3) Make sure that connection is correctly made AC to ACpower source.
(4) Turn on the power of the TV and measuring instruments forwarming up for at least 30 minutes before startingadjustments.
(5) If the receive or input signal is not specified, use the mostappropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors,transformers and condensers) not shown in the adjustmentitems of this service adjustment.
4.2 PRESET SETTING BEFORE ADJUSTMENTSUnless otherwise specified in the adjustment items, preset thefollowing functions with the REMOTE CONTROL UNIT.
4.3 MEASURING INSTRUMENT AND FIXTURES Signal generator (Pattern generator) [PAL] Remote control unit
4.4 ADJUSTMENT ITEMS VIDEO CIRCUIT
WHITE BALANCE (HIGH LIGHT) adjustment
4.5 BASIC OPERATION OF SERVICE MODE4.5.1 HOW TO ENTER THE SERVICE MODE
(1) Press [INFORMATION] key and [MUTING] key on theremote control unit simultaneously to enter the SERVICEMODE SCREEN.
(2) In the SERVICE MENU, press the [1] key to displayADJUSTMENT MODE SCREEN.
NOTE: Before enter the SERVICE MODE, press the [MODE] key to
confirm that "TV" position is indicated. If it is in a wrongposition, the SERVICE MODE operation cannot beperformed.
When a number key other than the [1] key is pressed in theSERVICE MODE SCREEN, the other relevant screen maybe displayed.This is not used in the adjustment procedure. Press the[MENU] key to return to the SERVICE MODE SCREEN.
4.5.2 HOW TO EXIT THE SERVICE MODEPress the [MENU] key to exit the Service mode.
4.5.3 SERVICE MODE SELECT KEY LOCATION
Setting item Settings positionPicture Mode Standard
Picture Adjustments Centre
Colour Temp. Normal
Super Digipure Auto
Movie Theatre Auto
Colour Management On
Picture Management On
Zoom Full
SERVICE MENUSERVICE MENU
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
SERVICE MENU SCREEN
[Nunber] key
[FUNCTION
/] key
[MUTING] key
[MODE] key
[INFORMATION] key
[Red] key
[MENU] key
[Green] key
[Function/] key
1-18 (No.YA545)
4.5.4 ADJUSTMENT MODEThis mode is used to adjust the VIDEO CIRCUIT and the MTS CIRCUIT.
4.5.4.1 HOW TO ENTER THE ADJUSTMENT MODEWhen the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [1] key to enter the ADJUSTMENT MODE.4.5.5 DESCRIPTION OF STATUS DISPLAY
(1) SIGNAL SYSTEMThe signal displayed on the screen is displayed.
(2) ZOOM MODEState of the SCREEN SIZE or MULTI PICTURE is displayed.SINGLE SCREEN
MULTI SCREEN
(3) PICTURE MODE
(4) COLOUR TEMP.
(5) SETTING ITEM NAMESetting item name are displayed. For the setting item namesto be displayed, refer to "INITIAL SETTING VALUES IN THESERVICE MODE".
(6) SETTING ITEM NO.Setting item numbers are displayed. The setting item numbersto be displayed are listed below.
(7) SETTING VALUE (DATA)The SETTING VALUE is displayed.
4.5.6 CHANGE AND MEMORY OF SETTING VALUESELECTION OF SETTING ITEM
[FUNCTION /] key.For scrolling up / down the setting items.
CHANGE OF SETTING VALUE (DATA) [FUNCTION /] key.
For scrolling up / down the setting values.
MEMORY OF SETTING VALUE (DATA)Changed setting value is memorized by pressing [MUTING]key.
PAL50 : PAL50Hz (Composite / S-video)PAL60 : PAL60Hz (Composite / S-video)SECAM : SECAMNTSC3 : NTSC3.58NTSC4 : NTSC4.43525I : 525i (Component)525P : 525p625I : 625i (Component)625P : 625p1125I5 : 1125i 50Hz1125I6 : 1125i 60HzRGB5 : RGB 525iRGB6 : RGB 625iPCVGA : PC (VGA)PCXGA : PC (XGA)D625I : DVB-T 625iH525I : HDMI 525iH525P : HDMI 525pH625I : HDMI 625iH625P : HDMI 625pH750P : HDMI 750pH125I5 : HDMI 1125i 50HzH125I6 : HDMI 1125i 60Hz--- : OTHER
FULL : FULLPANO : PANORAMIC1609 : 16:9 ZOOM1609S : 16:9 ZOOM SUBTITLE1409 : 14:9 ZOOMREGU : REGULAR
M2 : 2-pictures multiM12 : 12-pictures multi
ADJUSTMENT MODE
SIGNAL SYSTEM ZOOM MODE PICTURE MODE
SETTING VALUE (DATA)SETTING ITEM No. SETTING ITEM
COLOUR TEMP.
S001 R DRIVE 137S001 R DRIVE 137
PAL50 FULL STD HPAL50 FULL STD H
SOFT : SOFTSTD : STANDARDBRI : BRIGHT
H : COOLM : NORMALL : WARM
Item No. Setting itemS001 - S009 Video system setting
T001 - T003 (NOT USED)
M001 - M224 (NOT USED)
F001 - F002 (NOT USED)
D001 (NOT USED)
Z001 (NOT USED)
S001...S009 T001...T003 M001...M224 F001...F002 D001 Z001return to S001
(No.YA545)1-19
4.6 INITIAL SETTING VALUES IN THE SERVICE MODE Perform fine-tuning based on the "initial values" using the remote control when in the Service mode. The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved
may be different from the default values. But, don't change the values that are not written in "ADJUSTMENT PROCEDURE". Theyare fixed values.
4.6.1 VIDEO SYSTEM SETTING
4.6.2 NOT USED ITEM (All values are Fixed values)
Item No. Item Variable range Setting valueS001 R DRIVE 0 - 255 137S002 G DRIVE 0 - 255 137S003 B DRIVE 0 - 255 137S004 RESERV 0 - 255 ---S005 2D YC 0 - 255 0S006 RESERV 0 - 255 ---S007 RESERV 0 - 255 ---S008 RESERV 0 - 255 ---S009 RESERV 0 - 255 ---
Item No. Item Variable range Setting valueT001 RESERV 0 - 15 ---T002 RESERV 0 - 63 ---T003 RESERV 0 - 63 ---M001 1E00 00 - FF ---M002 1E01 00 - FF ---M003 1E02 00 - FF ---M004 1E03 00 - FF ---M005 1E04 00 - FF ---M006 1E05 00 - FF ---M007 1E06 00 - FF ---M008 1E07 00 - FF ---M009 1E08 00 - FF ---M010 1E09 00 - FF ---M011 1E0A 00 - FF ---M012 1E0B 00 - FF ---M013 1E0C 00 - FF ---M014 1E0D 00 - FF ---M015 1E0E 00 - FF ---M016 1E0F 00 - FF ---M017 1E10 00 - FF ---M018 1E11 00 - FF ---M019 1E12 00 - FF ---M020 1E13 00 - FF ---M021 1E14 00 - FF ---M022 1E15 00 - FF ---M023 1E16 00 - FF ---M024 1E17 00 - FF ---M025 1E18 00 - FF ---M026 1E19 00 - FF ---M027 1E1A 00 - FF ---M028 1E1B 00 - FF ---M029 1E1C 00 - FF ---M030 1E1D 00 - FF ---M031 1E1E 00 - FF ---
M032 1E1F 00 - FF ---M033 1E20 00 - FF ---M034 1E21 00 - FF ---M035 1E22 00 - FF ---M036 1E23 00 - FF ---M037 1E24 00 - FF ---M038 1E25 00 - FF ---M039 1E26 00 - FF ---M040 1E27 00 - FF ---M041 1E28 00 - FF ---M042 1E29 00 - FF ---M043 1E2A 00 - FF ---M044 1E2B 00 - FF ---M045 1E2C 00 - FF ---M046 1E2D 00 - FF ---M047 1E2E 00 - FF ---M048 1E2F 00 - FF ---M049 1E30 00 - FF ---M050 1E31 00 - FF ---M051 1E32 00 - FF ---M052 1E33 00 - FF ---M053 1E34 00 - FF ---M054 1E35 00 - FF ---M055 1E36 00 - FF ---M056 1E37 00 - FF ---M057 1E38 00 - FF ---M058 1E39 00 - FF ---M059 1E3A 00 - FF ---M060 1E3B 00 - FF ---M061 1E3C 00 - FF ---M062 1E3D 00 - FF ---M063 1E3E 00 - FF ---M064 1E3F 00 - FF ---M065 1E40 00 - FF ---M066 1E41 00 - FF ---M067 1E42 00 - FF ---M068 1E43 00 - FF ---M069 1E44 00 - FF ---M070 1E45 00 - FF ---M071 1E46 00 - FF ---M072 1E47 00 - FF ---M073 1E48 00 - FF ---M074 1E49 00 - FF ---M075 1E4A 00 - FF ---M076 1E4B 00 - FF ---
Item No. Item Variable range Setting value
1-20 (No.YA545)
M077 1E4C 00 - FF ---M078 1E4D 00 - FF ---M079 1E4E 00 - FF ---M080 1E4F 00 - FF ---M081 1E50 00 - FF ---M082 1E51 00 - FF ---M083 1E52 00 - FF ---M084 1E53 00 - FF ---M085 1E54 00 - FF ---M086 1E55 00 - FF ---M087 1E56 00 - FF ---M088 1E57 00 - FF ---M089 1E58 00 - FF ---M090 1E59 00 - FF ---M091 1E5A 00 - FF ---M092 1E5B 00 - FF ---M093 1E5C 00 - FF ---M094 1E5D 00 - FF ---M095 1E5E 00 - FF ---M096 1E5F 00 - FF ---M097 1E60 00 - FF ---M098 1E61 00 - FF ---M099 1E62 00 - FF ---M100 1E63 00 - FF ---M101 1E64 00 - FF ---M102 1E65 00 - FF ---M103 1E66 00 - FF ---M104 1E67 00 - FF ---M105 1E68 00 - FF ---M106 1E69 00 - FF ---M107 1E6A 00 - FF ---M108 1E6B 00 - FF ---M109 1E6C 00 - FF ---M110 1E6D 00 - FF ---M111 1E6E 00 - FF ---M112 1E6F 00 - FF ---M113 1E70 00 - FF ---M114 1E71 00 - FF ---M115 1E72 00 - FF ---M116 1E73 00 - FF ---M117 1E74 00 - FF ---M118 1E75 00 - FF ---M119 1E76 00 - FF ---M120 1E77 00 - FF ---M121 1E78 00 - FF ---M122 1E79 00 - FF ---M123 1E7A 00 - FF ---M124 1E7B 00 - FF ---M125 1E7C 00 - FF ---M126 1E7D 00 - FF ---
Item No. Item Variable range Setting valueM127 1E7E 00 - FF ---M128 1E7F 00 - FF ---M129 1E80 00 - FF ---M130 1E81 00 - FF ---M131 1E82 00 - FF ---M132 1E83 00 - FF ---M133 1E84 00 - FF ---M134 1E85 00 - FF ---M135 1E86 00 - FF ---M136 1E87 00 - FF ---M137 1E88 00 - FF ---M138 1E89 00 - FF ---M139 1E8A 00 - FF ---M140 1E8B 00 - FF ---M141 1E8C 00 - FF ---M142 1E8D 00 - FF ---M143 1E8E 00 - FF ---M144 1E8F 00 - FF ---M145 1E90 00 - FF ---M146 1E91 00 - FF ---M147 1E92 00 - FF ---M148 1E93 00 - FF ---M149 1E94 00 - FF ---M150 1E95 00 - FF ---M151 1E96 00 - FF ---M152 1E97 00 - FF ---M153 1E98 00 - FF ---M154 1E99 00 - FF ---M155 1E9A 00 - FF ---M156 1E9B 00 - FF ---M157 1E9C 00 - FF ---M158 1E9D 00 - FF ---M159 1E9E 00 - FF ---M160 1E9F 00 - FF ---M161 1EA0 00 - FF ---M162 1EA1 00 - FF ---M163 1EA2 00 - FF ---M164 1EA3 00 - FF ---M165 1EA4 00 - FF ---M166 1EA5 00 - FF ---M167 1EA6 00 - FF ---M168 1EA7 00 - FF ---M169 1EA8 00 - FF ---M170 1EA9 00 - FF ---M171 1EAA 00 - FF ---M172 1EAB 00 - FF ---M173 1EAC 00 - FF ---M174 1EAD 00 - FF ---M175 1EAE 00 - FF ---M176 1EAF 00 - FF ---
Item No. Item Variable range Setting value
(No.YA545)1-21
4.7 ADJUSTMENT PROCEDURE4.7.1 VIDEO CIRCUIT
M177 1EB0 00 - FF ---M178 1EB1 00 - FF ---M179 1EB2 00 - FF ---M180 1EB3 00 - FF ---M181 1EB4 00 - FF ---M182 1EB5 00 - FF ---M183 1EB6 00 - FF ---M184 1EB7 00 - FF ---M185 1EB8 00 - FF ---M186 1EB9 00 - FF ---M187 1EBA 00 - FF ---M188 1EBB 00 - FF ---M189 1EBC 00 - FF ---M190 1EBD 00 - FF ---M191 1EBE 00 - FF ---M192 1EBF 00 - FF ---M193 1EC0 00 - FF ---M194 1EC1 00 - FF ---M195 1EC2 00 - FF ---M196 1EC3 00 - FF ---M197 1EC4 00 - FF ---M198 1EC5 00 - FF ---M199 1EC6 00 - FF ---M200 1EC7 00 - FF ---M201 1EC8 00 - FF ---M202 1EC9 00 - FF ---M203 1ECA 00 - FF ---
Item No. Item Variable range Setting valueM204 1ECB 00 - FF ---M205 1ECC 00 - FF ---M206 1ECD 00 - FF ---M207 1ECE 00 - FF ---M208 1ECF 00 - FF ---M209 1ED0 00 - FF ---M210 1ED1 00 - FF ---M211 1ED2 00 - FF ---M212 1ED3 00 - FF ---M213 1ED4 00 - FF ---M214 1ED5 00 - FF ---M215 1ED6 00 - FF ---M216 1ED7 00 - FF ---M217 1ED8 00 - FF ---M218 1ED9 00 - FF ---M219 1EDA 00 - FF ---M220 1EDB 00 - FF ---M221 1EDC 00 - FF ---M222 1EDD 00 - FF ---M223 1EDE 00 - FF ---M224 1EDF 00 - FF ---F001 DD 0 - 1 ---F002 RAM REF 0 - 1 ---D001 RESERV 0 - 255 ---Z001 RESERV 0 - 255 ---
Item No. Item Variable range Setting value
Item Measuring instrument Test point Adjustment part Description
WHITE BALANCE (HIGHLIGHT)
Remote control unit
Signalgenerator
[1.ADJUST]S001: R DRIVE (Red drive)S002: G DRIVE (Green drive)S003: B DRIVE (Blue drive)
(1) Receive a PAL 75% all white signal.(2) Set PICTURE MODE to "STANDARD".(3) Set ZOOM to "FULL".(4) Set COLOUR TEMP. to "NORMAL".(5) Select "1.ADJUST" from the SERVICE MODE.(6) Adjust to Keep one of (Red drive),
(Green drive) or (Blue drive)unchanged, then lower the other two so that theall-white screen is equally white throughout.
NOTE:Set one or more of , , and to "137".
(7) Check that white balance is properly trackedfrom low light to high light. If the white balancetracking is deviated, adjust to correct it.
(8) Press the [MUTING] key to memorize the setvalue.
1-22 (No.YA545)
SECTION 5TROUBLESHOOTING
5.1 SELF CHECK FEATURE5.1.1 OUTLINEThis unit comes with the "Self check" feature, which checks theoperational state of the circuit and displays/saves it duringfailure.Diagnosis is performed when power is turned on, andinformation input to the main microcomputer is monitored at alltime.Diagnosis is displayed in 2 ways via screen display and LEDflashes. Failure detection is based on input state of I2C bus andthe various control lines connected to the main microcomputer.
5.1.2 HOW TO ENTER THE SELF CHECK MODEBefore enter the SELF CHECK MODE, press the [MODE] key toconfirm that "TV" position is indicated. If it is in a wrong position,the SELF CHECK MODE operation cannot be performed.
(1) Press the [INFORMATION] key and [MUTING] keysimultaneously, then enter the SERVICE MODE.
(2) Press the [2] key SELF CHECK MODE. (3) Press the [RED] key to enter Page 2 of the SELF CHECK
MODE.*Use the [GREEN] key to toggle between Page 1 and Page 2.
NOTE:When a number key other than the [2] key is pressed in theSERVICE MODE screen, the other relevant screen may bedisplayed.This is not used in the SELF CHECK MODE. Press the[MENU] key to return to the MAIN MENU SCREEN.
5.1.3 HOW TO EXIT THE SELF CHECK MODETo Save Failure History:Turn off the power by unplugging the AC power cord plug whenin the Self check display mode.To Clear (Reset) Failure History: Turn off the power by pressing the [POWER] key on the remotecontrol unit when in the Self check display mode.
5.1.4 FAILURE HISTORYFailure history can be counted up to 9 times for each item. Whenthe number exceeds 9, display will remain as 9. Failure historywill be stored in the memory unless it has been deleted.
5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECKFEATURE
In addition to circuit failures (abnormal operation), the followingcases may also be diagnosed as "Abnormal" and counted.
(1) Temporary defective transmissions across circuits due topulse interruptions.
(2) Misalignment in the on/off timing of power for I2C bus (Vcc)when turning on/off the main power.
Therefore, turn on the main power, and then wait for about 3seconds before starting Self check. If recurrences are expected, ensure to clear (reset) the failurehistory and record the new diagnosis results.
Fig.5-1
SERVICE MENU SCREEN
SELF CHECK MODE SCREEN (Page 1)
SELF CHECK MODE SCREEN (Page 2)
ItemFailure
history
SERVICE MENUSERVICE MENU
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
TMP 0 L 1 0TMP 0 L 1 0
L 2 0 DDT 0L 2 0 DDT 0
FAN 0 L C 0FAN 0 L C 0
IRS 0IRS 0
LOB 0 FAN 0LOB 0 FAN 0
AUD 0 AUD 0
ANA 9 DIG 9ANA 9 DIG 9
HOUR 131070 MAX 00HOUR 131070 MAX 00
00 00
Not used
ItemFailure
history
Press [Red] key
Press [2] key
Press [Green] key
(No.YA545)1-23
5.1.6 DETAILSSelf check is performed for the following items: (---- is not used items)
5.1.7 METHOD OF DISPLAY WHEN A RASTER IS NOT OUTPUTIn the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.
If error is detected, the power is turned off.Shortly after a power is turned off, POWER LED will be blinked.Power cannot be turned on until the power cord takes out and inserts, after a power is turned off.
Detection item Display Detection content Diagnosis signal (line) Detection timing
Low bias line short protection
LOB [LT-42DP8BG/P, LT-42DP8BJ/P]Confirm the operation of the low bias (5V / 12V /13.5V) protection circuit.Q9401, Q9601, Q9703 [DC-DC PWB]
LB_PRO Detection starts 3 seconds afterthe power is turned on. If errorcontinues between 200 ms thepower is turned off.
[LT-42P80BU/P]Confirm the operation of the low bias (5V / 12V /13.5V) protection circuit.Q9401, Q9601, Q9801 [DC-DC PWB]
---- FAN ---- ---- ----
---- AUD ---- ---- ----
Devices on the ANALOG PWB
ANA Confirmation of reply of ACK signal which usesI2C communication.IC101, IC102, IC601, IC3501, TU3001[ANALOG PWB]
SDA Detection starts 3 seconds afterthe power is turned on. If it checkswhenever I2C communication isperformed and no reply of ACKsignal an error will be counted.
Devices on the DIGITAL PWB
DIG Confirmation of reply of ACK signal which usesI2C communication.IC5001 [DIGITAL PWB]
SDA Detection starts 3 seconds afterthe power is turned on. If it checkswhenever I2C communication isperformed and no reply of ACKsignal an error will be counted.
Detection item Display Detection content Diagnosis signal (line) Detection timing
---- TMP ---- ---- ----
---- L1 ---- ---- ----
---- L2 ---- ---- ----
---- DDT ---- ---- ----
---- FAN ---- ---- ----
---- LC ---- ---- ----
---- IRS ---- ---- ----
Type of error POWER LED flash cycleLow bias line short protection POWER LED turnig on and off at 1 second intervals.
(No.YA545)VPT
Printed in Japan
Victor company of Japan, LimitedDisplay category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan
COPYRIGHT 2007 VICTOR COMPANY OF JAPAN, LIMITED No.YA545
2007/8
YA494200611
LT-42DP8BG/P,
LT-42DP8BJ/P,
LT-42P80BU/P
SCHEMATIC DIAGRAMS
CD-ROM No.SML200708
INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISION
BASIC CHASSIS
FL5
(No.YA545)2-1
5.NOTE FOR REPAIRING SERVICE
This model's power circuit is partly different in the GND. The
difference of the GND is shown by the LIVE : ( ) side GND and the
ISOLATED(NEUTRAL) : ( ) side GND. Therefore, care must be
taken for the following points.
(1)Do not touch the LIVE side GND or the LIVE side GND and the
ISOLATED(NEUTRAL) side GND simultaneously. if the above
caution is not respected, an electric shock may be caused.
Therefore, make sure that the power cord is surely removed from
the receptacle when, for example, the chassis is pulled out.
(2)Do not short between the LIVE side GND and ISOLATED(NEUTRAL)
side GND or never measure with a measuring apparatus measure
with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND
and ISOLATED(NEUTRAL) side GND at the same time.
If the above precaution is not respected, a fuse or any parts will be broken.
Since the circuit diagram is a standard one, the circuit and
circuit constants may be subject to change for improvement
without any notice.
NOTE
Due improvement in performance, some part numbers show
in the circuit diagram may not agree with those indicated in
the part list.
When ordering parts, please use the numbers that appear
in the Parts List.
STANDARD CIRCUIT DIAGRAM
NOTE ON USING CIRCUIT DIAGRAMS
(7)Ground symbol
: LIVE side ground
: ISOLATED(NEUTRAL) side ground
: EARTH ground
: DIGITAL ground
(6)Connecting method
: Connector : Wrapping or soldering
: Receptacle
(5)Test point
: Test point : Only test point display
Respective voltage values are indicated
: B1
: 9V : 5V
: B2 (12V)
(4)Power Supply
Type
MM : Metalized mylar capacitorPP : Polypropylene capacitorMPP : Metalized polypropylene capacitorMF : Metalized film capacitorTF : Thin film capacitorBP : Bipolar electrolytic capacitorTAN : Tantalum capacitor
(3)Coils
No unit
Others
: [H]
: As specified
No indication : Ceramic capacitor
(2)Capacitors
Capacitance value
1 or higher : [pF]
less than 1 : [F]
Withstand voltage
No indication : DC50[V]
Others : DC withstand voltage [V]
AC indicated : AC withstand voltage [V]
Electrolytic Capacitors
47/50[Example]: Capacitance value [F]/withstand voltage[V]
Composition resistor 1/2 [W] is specified as 1/2S or Comp.
Type
No indication : Carbon resistor
OMR : Oxide metal film resistor
MFR : Metal film resistor
MPR : Metal plate resistor
UNFR : Uninflammable resistor
FR : Fusible resistor
4.INDICATIONS ON THE CIRCUIT DIAGRAM(1)Resistors
Resistance value
No unit : []K : [k]M
Rated allowable power
No indication : 1/16 [W]
Others : As specified
: [M]
3.INDICATION OF PARTS SYMBOL [EXAMPLE]
In the PW board : R209 R209
1.SAFETY
The components identified by the symbol and shading are
critical for safety. For continued safety replace safety ciritical
components only with manufactures recommended parts.
Since the voltage values of signal circuit vary to some extent
according to adjustments, use them as reference values.
2.SPECIFIED VOLTAGE AND WAVEFORM VALUES
The voltage and waveform values have been measured under the
following conditions.
(1)Input signal : Colour bar signal
(2)Setting positions of
each knob/button and
variable resistor
(3)Internal resistance of tester : DC 20k/V(4)Oscilloscope sweeping time : H 20s / div
: V 5ms / div
: Othters Sweeping time is
specified
(5)Voltage values : All DC voltage values
: Original setting position
when shipped
LT-42DP8BG/P, LT-42DP8BJ/P, LT-42P80BU/P
SEMICONDUCTOR SHAPES
CONTENTSSEMICONDUCTOR SHAPES ......................................................................2-2WIRING DIAGRAM ........................................................................................2-3BLOCK DIAGRAM........................................................................................2-5CIRCUIT DIAGRAMS....................................................................................2-7
ANALOG PWB CIRCUIT DIAGRAM........................................................................................................... 2-7DIGITAL PWB CIRCUIT DIAGRAM .......................................................................................................... 2-19POWER PWB CIRCUIT DIAGRAM .......................................................................................................... 2-53LED PWB CIRCUIT DIAGRAM................................................................................................................. 2-59SW PWB CIRCUIT DIAGRAM ................................................................................................................. 2-61DC-DC PWB CIRCUIT DIAGRAM............................................................................................................. 2-63
PATTERN DIAGRAMS .............................................................................. 2-65ANALOG PWB PATTERN ........................................................................................................................ 2-65DIGITAL PWB PATTERN ......................................................................................................................... 2-67POWER PWB PATTERN .......................................................................................................................... 2-71LED PWB PATTERN ................................................................................................................................ 2-73SW PWB PATTERN ................................................................................................................................ 2-73DC-DC PWB PATTERN ............................................................................................................................ 2-74
VOLTAGE CHARTS .................................................................................. 2-75WAVEFORMS ............................................................................................ 2-77
USING P.W. BOARD
IC
BOTTOM VIEW FRONT VIEW TOP VIEW
1 N
N1
OUT
E
IN
IN OUTE
1 N
TOP VIEW
1
N
1
N
CHIP IC
TRANSISTOR
BOTTOM VIEW FRONT VIEW TOP VIEW
CHIP TR
E
C
BE C B
C
B EB(G)
E(S)
C(D) E C B
E C B
2-2(No.YA545)
ANALOG P.W. BOARD
SW P.W. BOARD
LED P.W. BOARD
POWER P.W. BOARD
DC-DC P.W. BOARD
DIGITAL P.W. BOARD
SFL-1251A-U2
SFL-7215A-U2
SFL-8721A-U2
SFL-9080A-U2
SFL-9188A-U2
LCA10737-18A(SFL-0D564A)
P.W.B ASSY name LT-42DP8BG/P LT-42DP8BJ/P
SFL-1252A-U2
SFL-8724A-U2
SFL-9193A-U2
LCA10737-19A(SFL-0D565A)
LT-42P80BU/P
2-4(No.YA545)(No.YA545)2-3
21
91
10
1
1 10
15
14
12
1
14
13
12
41
1
50
140
1
CN00R
CN00U
CN0SR
CN001
CN002 CN0LV1
CN0SL
CN200R
91
CN100U
F9001250V/6.3A
CN00W
CN00P
CN00F
CN00A
CN0PW
114
15
1
1 15
CN00A
CN0DC
123
CN00H
123
CN00H
CN10F
ANALOG
TUNER
1 15CN0DC
112
CN000W
150
140
CN001
CN002
INVERTER PWB
(SLAVE SIDE)
INVERTER PWB
(MASTER SIDE)
CN00Q
110
13
1
CN0UV
16
CN0ID
PL302
101
CN0UD
PL301PL103
1 6 1 131 10TOP
DIGITAL TUNER MODULE PWB
[only LT-42DP8 series]
[only LT-42DP8 series]
[only LT-42DP8 series]
[only LT-42DP8 series]
LED PWB
DC-DC PWB
TOP
TOP
FRONT
TOP TOP
TOP
TOP
DIGITAL PWB
ANALOG PWB
SW PWB
POWER PWB
POWER CORD
SPEAKER (R) SPEAKER (L)LCD PANEL UNIT
CONTROL PWB
WIRING DIAGRAM
(No.YA545)2-5 2-6(No.YA545)
DEC_Y
V1_VIN
V2_VIN
V3_VIN
V1_YIN
V1_CIN
V2_CIN
V3_CIN
DTU_LIN/RIN
DIN_L/R
TV_L/R
V1_LIN/RIN
V2_LIN/RIN
V3_LIN/RIN
V4_LIN/RIN
V2_YIN
V3_YIN
MON_L/R
FIX_L/R
IC6001
D8771/D8772
S7807
J7101
IC751
IC8772
IC8771EE_CDS
POWER_LED
REMOCON
HP_L/R
MECA_SW
KEY_1/2
IC6001 IC5001
IC6101
IC7201
IC7203
DQADRS
SD_DQ1-32
A0-21
D0-15
A0-21
D0-15
TU3001
UHF/VHF TUNER
IC102
Y_OUT
BY_OUT
RY_OUT
SUB_C
MAIN_C
IC101
MAIN_VY
SUB_VY
Y/CMIX
IC601
AMP_L/R
S7801S7806
E.E. SENSOR
DTU_Y/Cb/CrDTU_VINDTU_LIN/RIN
HDMI
RECEIVE
DV1_R0-7
DV1_Y0-7
DV1_B0-7
SUB_VY
YM_IN/
BYM_IN/
RYM_IN
HDMI
HDMI
DIN_DL/DR
IC7301IC7602
MI_TX/MI_RX/MI_CLK
OSDR1-5/OSDG1-5/OSDB1-5
IC5002IC5003
FRAME INTERPOLATE/LCD CONTROL/
LVDS DRIVE
SUB_C
V4_Cb
V4_Cr
V4_Y
DTU_Cb
DTU_Cr
DTU_Y
B1
R1
G1
B2
R2
G2
PC_B
PC_R
PC_G
MAIN_C
MAIN_VY
RE(0)P/NRE(1)P/NRE(2)P/NRE(3)P/NRECLK+/-
MAIN_L/R
LVR0-7/LVG0-7/LVB0-7
ANALOG PWB
DIGITAL PWB
SW PWB
LED PWB
POWER
IR RECEIVE
HEADPHONE
CONTROLSWITCH
POWER
SPEAKER (R)
SPEAKER (L)
LCD PANEL
DIGITAL
TUNER
MODULE
[only LT-42DP8 series]
VIDEO/AUDIO SELECT
VIDEO SELECT
PROGRAMMEMORY
PROGRAMMEMORY
FRAMEMEMORY
YC SEPARATE/CHROMA DEMODURATE/FORMAT CONVERT/NOISE REDUCT/RGB PROCESS/OSD COMPOSITION/SUB CPU
MAIN CPUMEMORY
AUDIO OUT
HEADPHONEAMP
AUDIO CONTROL
YC SEPARATE/CHROMA DEMOD./
FORMAT CONVERT/NOISE REDUCT
RGBPROCESS
OSDMIX
SUB CPU
A-D CONVERT
A-D CONVERT
A-DCONVERT
D-ACONVERTVOLUME
BASSBOOST
TREBLEBOOST
STEREOBOOST EQUALIZE
V
L/R
EXT-3
AUDIO OUT L/R
PC INPUT
S-VIDEO
Y
Pb/Cb
Pr/Cr
EXT-1
EXT-4
EXT-2
L/R
FRAMEMEMORY
RO(0)P/NRO(1)P/NRO(2)P/NRO(3)P/NROCLK+/-
EXT-5
EXT-6
UKD_TXUKD_RX
MAIN_CCD
TEXT_R/G/B
TEXT_G
TEXT_B
TEXT_R
MON_VOUT
DTU_VIN
MON_V
MON_L/R
MON_V
V1
Y1/C1
L1/R1
Y4/CB4/CR4
R1/G1/B1
R2/G2/B2
Y2/C2
L2/R2
V2
L3/R3
V3
L4/R4
PC_R/G/B
Y3/C3
TV_MAIN
MON_TV
TV_L/R
D-AA-DAGC DEMOD.
IC3501 MULTI SOUND PROCESS
MATRIX TV_L/RTV_SIF
TV_MONO
IC105VIDEO AMP
IC104
VIDEOAMP
Y/CMIX
BLOCK DIAGRAM
2-8(No.YA545)(No.YA545)2-7
ANALOG PWB ASS'Y(1/6)SFL-1251A-U2 [LT-42DP8BG/P, LT-42DP8BJ/P]
SFL-1252A-U2 [LT-42P80BU/P]
c10520001b002_0702_2/6_0.0
R3021
R3022
TU3001
R3013
SDA3A5
SCL3A5
R3004C3006
C3015
R3023
L3001
MSP_RSTO
C3505
R3001
C3005
C3011
C3004
K3001
Q3001
R3006
C3019
C3018
TU3001
C3010
R3017R3005
Q3004
C3008L3002
TV_MAIN
C3501
C3536
C3007
C3002
R3015
IC3504
C3530
C3544 C3546
R3024
R3016
R3014
R3003
R3517
C3016
C3518
Q3503
L3004
C3014
R3018
R3019C3017
C3012 C3013C3009
R3008
C3001
R3009
R3010R3012
R3002
R3011
Q3003
C3003
Q3005
R3020
TV_L
TV_R
AFT1
AGC1
R3025
D3501
C3545
K3501
C3533
C3532
C3535
C3534
C3523C3524
K3502
IC3501
X3501
C3502
C3537
C3531
C3529
C3525 C3526
R3516
C3517
C3515
LC3501 L3504
C3516
R3515
R3514
L3503
R3510
C3528
L3003
R3546
R3547
C3547
C3513
C3512
C3503 R3509
C3514
OPEN
OPEN 1k
100
1
OPEN
OPEN
OPEN
OPEN
OPEN
.01
OPEN
PNP
0
.01
.01
1501K
NPN10
*5
*5
.1/50
100
2.2k
OPEN
*5
1 1
OPEN
1k
180
100
10k
18p
2200p
47p
47
270.01
820p 47p10
0
.1
2.2k
1k330
100
680
NPN
OPEN
NPN
1k
100K
OPEN
OPEN
OPEN
.1
.1
.001.001
.1
.1
.1
10
10 .01
100
.01
.1 100
100
100
OPEN
OPEN
0 0
OP
EN
2p
.01
.01
OP
EN
2p
BS_A5V
GND
SDA3A5
SCL3A5
AFT1
GND
32V
AGC1
BS_A9V
TV_MAIN
TV_L
TV_R
GND
BS_A5V
MSP_RSTO
BS_A9V
GND
SHEET 2
SHEET 2
SHEET 2,3
SHEET 2,3,6
UHF/VHF TUNER
MULTI SOUND PROCESS
CIRCUIT DIAGRAMS ANALOG PWB CIRCUIT DIAGRAM (1/6) [TU/MSP BLOCK] SHEET 1
(No.YA545)2-9 2-10(No.YA545)
ANALOG PWB ASS'Y(2/6)SFL-1251A-U2 [LT-42DP8BG/P, LT-42DP8BJ/P]
SFL-1252A-U2 [LT-42P80BU/P]
c10520001b001_0702_1/6_0.0
V2_YS
R277
C211
SCL3A5
SDA3A5
V4_LIN
CN002
V2_G_Y
V2_B_Cb
V2_SL
V2_R_Cr
V1_SL
R230
V4_RIN
AMP_MUTE
CARD_CK
CN00U
V2_LIN
V1_G_Y
CARD_DA
CN0UV
R228
D283
R279
R274
R275
C261
C264
R241
K106
R183
R243
CN00R
SDA3A
SCL3A
R251
K107
R255
K108
FIX_R
K103
R259
FIX_L
V1_B_Cb
TV_LINK
R236
IC104
C148
C213
R224
CNCV2
C150
C151
C212
R206
Q107
Q106
D284
CNCV1
V3_CIN
HP_L
C149
R260
V1_YIN
R276 R261
D290
V3_YIN
HP_MUTE
K105
HP_R
HP_DET
Q110
C194
R262
R264
R207
R266
R263
R265R267
Q111
Q112
R278
C195
PC_R
Q109
C196
D105
PC_G
PC_B
PC_HS
PC_VS
C290
R290
R205
IC541
R538
R535
C533
IC105
C152
C154
C155C153
D503
K104
K102
K101
A_MUTE
R269
M_MUTE
R221
CN0UV
Q114
R268
R269
R270
R271
R584
R585
Q115
R203
R204
R222
M_PACK
C194
C195
C196
Q108
R223
R225
C166
C197
C198
R270
R268
V1_LIN
V3_VIN
V3_LIN
V3_RIN
R197
DIN_PHOTO
V2_RIN
V2_VIN
V1_R_Cr
V1_RIN
V1_YS
V1_VIN
V1_CIN
MON_R
MON_L
MON_V
MON_TV
C207
C199
C208
CN001
C200
C201
C202
C118
C207
C208
C209
C210
R584
R585
R586
R587
V4_R_Cr
V4_B_Cb
V4_G_Y
V2_YIN
V2_CIN
R271
C125
C124
C121
R163
R162
R161
IC101
IC102
R164
C119
R165
C120
R166
C126
R167
C132R181
C143
C142
C133
C141
R189
C138
R184
R188
C173
C171
C170
C169
C172
R242
R250
R254
C176 C174
C175
R238
R239
R245
R246
R247
R248
R252
R256
C189
C168
C167
C186
C187
C177
C123
C122
C117
D101 D102
R169 R168
C131
C130
R237
C134
MAIN_L
MAIN_R
C139
C263C262
C184
R231 C185
Q113
R232
L101
R229
R288
R289
R293
R294
TV
_R
TV
_L
TV
_M
AIN
R3
05
MA
IN_
PO
W
R3
06
R2
01
M_
MU
TE
A_
MU
TE
R1
71
AG
C1
MA
XX
_R
ST
R3
08
C1
61
R3
07
AC
_IN
PO
W_
GO
OD
R1
70
C1
27
MS
P_
RS
TO
R2
02
R208
C1
06
C216
C217
C218
C219
C220
R209
R210
R2
11
R2
12
R2
13
R3
10
R3
11
R3
12
10
80
P_
SW
B1
_P
OW
R2
15
R3
09
R2
74
AF
T1
C1
16
R1
40
R1
41
R1
43
R1
44
R3
00
R1
46
R1
47
R3
03
R3
04
R3
02
R3
01
R1
48
R1
49
C1
07
R1
51
C1
08
R1
52
R1
53
R1
54
R1
55
R1
50
R1
57
R1
45
R1
56
R1
58
R1
59
R1
60
R235
R234
R1
42
C1
28
C1
29
R233
C1
56
C1
57
C1
58
R2
16
R2
17
R2
18
C183
C182
C181 C178
D1
03
D1
04
R2
19
R2
20
C180
C179
L1
04
L1
03
L1
02
C2
82
C2
83
C2
84
C2
85
C2
86
C2
87
R1
90
R1
91
R1
92
C2
91
C2
92
C2
93
0OPEN
OPEN
330
0
OPEN
0
0.1
0.1
0
82k
0
15k
15k
0
330
1
2.2
OPEN
OPEN
100
10
2.2
5.6k
OPEN
10
100
02.7k
OPEN
OPEN
PNP2
100
100
5.6k
100
330
330
330
PNP2
PNP2
0
PNP2
OPEN
OPEN
OPEN
1k
100
0.1
1
100
1010
OPEN
OPEN
OPEN
0
0
0
OPEN
OPEN
OPEN
OPEN
75
75
75
75
10k
10k
OPEN
OPEN
10/10
10/10
10/10
0
2.2/16
2.2/16
0.1
OPEN
OPEN
0.1
0.1
0.1
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
1
OPEN
OPEN
OPEN
OPEN
OPEN
1
1
1
OPEN
OPEN
0
220k
1
220k
1
220k
1
220k
1220k
0.1
0.1
1
10
0
0.01
220k
10k
68p
0.01
0.01
0.01
0.022
330
22k
22k
0.01 330p
OPEN
0
0
0
0
0
0
0
0
10
0.1
0.1
OPEN
0.1
0.1
0.1
0.1
0.1
OPEN OPEN
100 100
0.1
47
0
1
1
0.10.1
150p
33 82p
NPN
470
OPEN
75
75
75
0
OP
EN
OP
EN
OP
EN
10
0
5.6
K
.01
5.6
K
OP
EN
10
5.6
K
OP
EN
4.7
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
0
OP
EN
10
6.8
k
6.8
k
6.8
k
6.8
k
0
OP
EN
OP
EN
6.8
k
6.8
k
0.16.8
K
476
.8K
6.8
k
6.8
k
OP
EN
33
K
33
K
33
k OP
EN
0 0 0
0 0
10
k
0.1
0.1
0
0.0
1
0.0
1
0.0
1 0 0 0
0.0
1
0.0
1
0.0
1
1
OP
EN
OP
EN
10
0
10
0
0.1
47
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
0 0 0
DTU_Cb
DTU_LIN
BS_A5V
A_MUTE
DTU_Cr
V4_RIN
V4_LIN
PC_R
V2_YIN
V2_R_Cr
V2_LIN
V1_G_Y
DTU_Y
V2_SL
V2_B_Cb
GND
MON_R
MON_L
MON_V
M_PACK
MON_TV
V2_RIN
V4_G_Y
V4_B_Cb
V4_R_Cr
V2_CIN
V3_RIN
V3_YIN
V2_G_Y
V2_YS
V2_VIN
AMP_MUTE
V3_YIN
CARD_DA
V3_CIN
V1_SL
DBS__LED2
V1_B_Cb
V1_R_Cr
V1_RIN
V1_YS
V3_CIN
V1_VIN
V1_LIN
V1_CIN
V3_VIN
GND
V1_YIN
DTU_RIN
CARD_CK
DTU_Y
V1_SL
DTU_Cb
SDA3A
MECA_SW
V2_SL
BS_A5V
BS_A9V
GND
GND
GND
V1_YS
BS_A3.3V
DTU_Cr
PC_R
KEY2
KEY1
HP_MUTE
PC_B
PC_G
V2_YS
V3_LIN
V2_R_Cr
V2_B_Cb
BS_A9V
V2_G_Y
PC_HS
M_MUTE
FIX_R
FIX_L
V3_VIN
TV_LINK
PC_B
GND
PC_VS
PC_G
GND
DTU_YIN
GND
DTU_CIN
GND
STB3.3V
STB_5V
BS_A5V
STB3.3V
BS_A5V
REC_LED
GND
DIN_R
GND
DIN_L
DIMMER
FIX_R
GND
GND
GND
FIX_L
SCL3A
DIN_PHOTO
BS_A5V
GND GND
BS_A5V
GND
GND
M_PACK
POW_LED
REMOCON
DBS__LED1
STB_5V
EE_CDS1
GND
BS_A5V
GND
GND
BS_A5V
GND
DTU_VIN
GND
BS_A5V
GND
BS_A9V
GND
CARD_RIN
DIN_R
CARD_LIN
GND
MAIN_VY
MAIN_C
SUB_C
BS_A5V
GND
MON_L
MON_R
BS_A5V
GND
DTU_CIN
MON_VOUT
BS_A5V
GND
GND
DTU2_RIN
DTU2_LIN
BS_A5V
BS_A5V
BS_A5V
GND
BS_A5V
BS_A9V
BS_A5V
GND
B1
_P
OW
TV
_M
AIN
CA
RD
_LIN
AM
P_
MU
TE
B1
_P
OW
V4
_R
_C
r
TV
_M
AIN
DT
U_V
IN
DE
C_Y
HP
_M
UT
E
V1_V
IND
IMM
ER
V1_Y
IN
DE
C_Y
A-M
UT
E
MO
N_
VO
UT
CA
RD
_R
IN
RE
MO
CO
N
AU
DIO
_R
MO
N_
TV
CA
RD
_C
r
CA
RD
_V
D
CA
RD
_H
D
TV
_R
TV
_L
CA
RD
_C
b
AU
DIO
_R
CA
RD
_Y
MA
IN_
VY
CA
RD
_C
r
RE
C_LE
D
EE
_C
DS
1
SC
L3
A
CA
RD
_H
D
DT
U2
_R
IN
CA
RD
_V
D
MO
N_V
V1_Y
S
PO
W_LE
D
TE
XT
_R
ME
CA
_S
W
KE
Y2
TE
XT
_G
CA
RD
_C
b
CA
RD
_Y
TE
XT
_B
V3
_L
IN
V3
_R
IN
A-M
UT
E
PO
W_
GO
OD
SD
A3A
1080P
_S
W
1080P
_S
W
CA
RD
_D
A
TV
_LIN
K
AC
_IN
V1_C
IN
MA
IN_
PO
W
MS
P_R
ST
O
MA
IN_
PO
W
V2_V
IN
AC
_IN
PO
W_
GO
OD
MS
P_R
ST
O
TE
XT
_R
KE
Y1
DB
S_
_L
ED
1
DB
S_
_L
ED
2
V2_Y
S
MA
XX
_R
ST
MA
XX
_R
ST
V2_Y
IN
V2_C
IN
TV
_M
AIN
V4
_B
_C
b
V4
_G
_Y
PC
_H
S
PC
_V
S
SU
B_C
MA
IN_C
DIN
_P
HO
TO
DT
U_R
IN
TV
_L
TV
_R
DT
U2
_L
IN
DT
U_
LIN
DIN
_L
V1
_L
IN
V1
_R
IN
V2
_L
IN
V2
_R
IN
V4
_L
IN
V4
_R
IN
TE
XT
_B
TE
XT
_G
V1
_G
_Y
V1_B
_C
b
V1_R
_C
r
CA
RD
_C
K
SHEET 1SHEET 1,3
SHEET 1
SHEET 5
SHEET 1,3,6
SHEET 5
SHEET 3
SHEET 3
SHEET 5
SHEET 5
SHEET 3,5
SHEET 3,5SHEET 6
OPEN OPEN
DIGITAL PWB(1/17) CN001
(SHEET 7)
LED PWBCN100U
(SHEET 27)
SW PWBCN200R
(SHEET 28)
DIGITAL PWB(5/17) CN002 (SHEET 11)
DIGITAL TUNER MODULE PWB [only LT-42DP8 series]
VIDEO/AUDIO SELECT VIDEO SELECT
VIDEO AMPVIDEO AMP
ANALOG PWB CIRCUIT DIAGRAM (2/6) [AV SW BLOCK] SHEET 2
2-12(No.YA545)(No.YA545)2-11
ANALOG PWB ASS'Y(3/6)SFL-1251A-U2 [LT-42DP8BG/P, LT-42DP8BJ/P]
SFL-1252A-U2 [LT-42P80BU/P]
c10520001b005_0702_5/6_0.0
C426
C427
C424
C425
C415
C416
Q435
D413
J403
D403
R491
MON_TV
D404
D405
D406
D407
D440
D441
C406
C405
C404
C403
D408
C420
C421
C422
C491
C492
C493
R421
R422
R423
D491
D423
D425
C410
D445
D424
J406
Q434
C445
C444
D444
D442
C440
C412
C413
C442
R410
R413
R414
C443
R412
C409
D411
R411
C411
D414
D412
D416
D415
D443
D422
D421
C419
C418
R419
R420
C402
C401
J410 C463
C462
C461 C464
D402
D401
V2_RIN
V2_CIN
V2_R_Cr
V2_SL
TV_LINK
Q438
C465
C466
SDA3A5
SCL3A5
V1_YS
TV_L
D463
V1_G_Y
V1_B_Cb
V1_CIN
V2_YS
V2_YIN
C433
V2_G_Y
V2_B_Cb
TV_R
D431
D432
D467
D468
MON_V
MON_L
C431
C432
A_MUTE
MON_R
V4_LIN
V4_RIN
R438
R441
Q437
M_MUTE
Q431
Q432
R440
R443
R439
R444
J405
R464
Q433
R442
R437
R467
R461
V3_YIN
V3_CIN
C494
V4_G_Y
V4_B_Cb
V4_R_Cr
D462D461
C456
D469
M_PACK
DIN_PHOTO
V3_RIN
V3_LIN
V3_VIN
R475 D465 D466
FIX_L
FIX_R
M_MUTE
V1_YIN
V1_VIN
V1_R_Cr
V1_LIN
V1_RIN
V1_SL
V2_VIN
V2_LIN
R476
D492
PC_HS
PC_R
PC_G
PC_B
C469
PC_VS
C468
D428
D427
R406
C455
C457
C451
Q444
Q445
R426
R427
C450
C449
R451
C448
R452
R453
R454
C428
C430
C429
C417
R404
R403
R402 D409 R405
R401
R450
J401
J402
D447 D446
C407
C441
C408
C446
C447
R488
R489
R487
R483
R484
R482Q439
R485
R486
C452
C453
C454
R457
R459
R455
R460
R446
R447
R445Q436
R448
R458
R456
R462
D470
OPEN
OPEN
OPEN
OPEN
1500p
1500p
*1
*2
1M
*2
*2
*1
*1
*1
*1
2.2
2.2
2.2
2.2
*1
2.2
2.2
2.2
10
0.1
100
75
75
75
*2
*2
.01
*2
*2
2.2
2.2 *2
*1
2.2
2.2
2.2
2.2
75
220k
220k
2.2
75
2.2
*1
75
2.2*1
*1
*1
*1
*2
*1
*1
2.2
2.2220k
220k
2.2
2.2
100p
100p
100p
2.2
*1
*1
2.2
2.2
*2
1
*1
*1
*1
*1
4.7
4.7
82K
82K
220
1k
680
39k
75
680
220
75
75
1000p
*2*2
1
*1
1K *2 *21K100p 100p
*1
*1
68
2.2
2.2
AV_GND
1500p
NPN
NPN
10K
10K
1500p
1500p
75
1500p
75
75
75
1500p
1500p
1500p
1500p
75
75
75 *1 75
75
75
*1 *1
2.2
2.2
2.2
2.2
2.2
82K
82K
220
3.3K
680
39k
680
220
1
2.2
2.2
82K
82K
2.2k
220
3.3K
680
39k
680
220
68
OP
EN
FIX_L
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
V1_R_Cr
V4_G_Y
GND
V1_G_Y
MON_TV
GND
V1_B_Cb
V2_YS
GND
GND
GND
GND
GND
GND
GND
V3_YIN
V3_VIN
GND
V3_LIN
GND
V4_B_Cb
V3_RIN
V4_R_Cr
BS_A5V
GND
GND
GND
GND
V3_CIN
GND
V4_LIN
GND
GND
GND
V4_RIN
GND
GNDGND
GND
GND
GND
FIX_R
GND
V2_YIN
V2_CIN
GND
V2_R_Cr
GND
GND
GND
GND
GND
GND
GND
V2_LIN
GND
GND
GND
GND
GND
V1_CIN
GND
V1_YS
FIX_L
GND
GND
GND
TV_LINK
V1_VIN
GND
GND
M_MUTE
GND
V1_YIN
GND
V2_B_Cb
V1_LIN
FIX_R
GND GND
V1_RIN