VCR Basic Service Data

Latin America After Sales

Indianapolis, IN 46290 U.S.A.

SAFETY NOTICE USE ISOLATION TRANSFORMER WHEN SERVICING

Components having special safety characteristics are identified by a ( ) on schematics and on parts list in this Service Data and its bulletins. Before servicing this instrument, it is important that the service technician read and follow the “Safety Precautions” in the Basic Service Data.

First Edition – First Printing Copyright 2003 – Thomson inc Printed in U.S.A. – Trademark(s) Registered – Marca(s) Registrada (s) CN-12C5

CN-12C5

CN-12C5 Nov / 03

Models Included: MCR51R410 MCR51R420 MCR53TF30

Contents Page

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Chassis Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Circuit Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

IC Pin Out and Functional Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

IC Voltage / Resistance Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix

Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix

Circuit Board Component Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix

A-PDF MERGER DEMOA-PDF MERGER DEMO

SERVICE MANUAL

SPECIFICATIONS

Model Number MCR51R410 MCR51R420 MCR53TF30

Colorsystem

PAL4.43, NTSC3.58, NTSC4.43 RF system

Soundsystem

D/K,I,M,B/G

Video system PAL4.43, NTSC3.58, NTSC4.43 (50/60Hz) VHF C1- C12 UHF C13-C57

Receivingchannel

CATV Z1-Z37Channels preset 236Picture tube Effectivescreen dimensions(Approx.)

280 210mm 406 305mm

Audio output (THD 7%)

2W

Power source 220-240V AC, 50Hz Weight (Approx.) 11.5kg 23.5kg 28kgDimensions(W H D) (Approx.)

375 356370mm

600 468 486mm605 480

489mmRated powerconsumption220V AC 50Hz

80W 69W 100W

Designs and specifications are subject to change without notice.

1

SERVICE MANUAL

INSTRUCTIONS FOR SERVICE SAFETY AND MAINTENANCE

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE X-RAY RADIATION

PRECAUTION , SAFETY PRECAUTION AND PRODUCT SAFETY NOTICE

INSTRUCTION BELOW.

X-RAY RADIATION PRECAUTION 1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit

X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage permissible in any

operating circumstances must not exceed the rated value. When checking the EHT, use the High

Voltage Check procedure in this manual using an accurate EHT voltmeter.

2. The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY radiation,

which ensures safety during normal operation. To prevent X-ray radiation, the replacement CRT

must be identical to the original fitted as specified in the parts list.

3. Some components used in this TV have safety related characteristics preventing the CRT from

emitting X-ray radiation. For continued safety, replacement component should be made after

referring the PRODUCT SAFETY NOTICE below.

4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT

anode. So ensure that the maximum EHT voltage does not exceed the rated value after service

and adjustment.

SAFETY PRECAUTION WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.

1. The TV has a nominal working EHT voltage of 28kV. Extreme caution should be exercised when

working on the TV with the back removed.

1.1 Do not attempt to service this TV if you are not conversant with the precautions and procedures for

working on high voltage equipment.

1.2 When handling or working on the CRT, always discharge the anode to the TV chassis before

removing the anode cap in case of electric shock.

1.3 The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take

extreme care while handling.

1.4 Do not hold the CRT by the neck as this is a very dangerous practice.

2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly

as supplied from factory.

3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable

isolating transformer of beyond rated overall power when servicing or connecting any test

equipment for the sake of safety.

4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W).

2

SERVICE MANUAL

5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to

avoid electronic gun magnetized and decrement in convergence of the CRT.

6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons,

switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the

original place.

7. Replace blown fuses within the TV with the fuse specified in the parts list.

8. When replacing wires or components to terminals or tags, wind the leads around the terminal

before soldering. When replacing safety components identified by the international hazard symbols

on the circuit diagram and parts list, it must be the company-approved type and must be mounted

as the original.

9. Keep wires away from high temperature components.

PRODUCT SAFETY NOTICE CAUTION: FOR YOUR PROTECTION, THE FOLLOWING PRODUCT SAFETY NOTICE

SHOULD BE READ CAREFULLY BEFORE OPERATING AND SERVICING THIS TV SET.

1. Many electrical and mechanical components in this chassis have special safety-related

characteristics. These characteristics are often passed unnoticed by a visual inspection and the

X-ray radiation protection afforded by them cannot necessarily be obtained by using replacements

rated at higher voltages or wattage, etc. Components which have these special safety

characteristics in this manual and its supplements are identified by the international hazard

symbols on the circuit diagram and parts list. Before replacing any of these components read the

parts list in this manual carefully. Substitute replacement components which do not have the same

safety characteristics as specified in the parts list may create X-ray radiation.

2. Do not slap or beat the cabinet or CRT, since this may result in fire or explosion.

3. Never allow the TV sharing a plug or socket with other large-power equipment. Doing so may

result in too large load, causing fire.

4. Do not allow anything to rest on or roll over the power cord. Protect the power cord from being

walked on, modified, cut or pinched, particularly at plugs.

5. Do not place any objects, especially heavy objects and lightings, on top of the TV set. Do not install

the TV near any heat sources such as radiators, heat registers, stove, or other apparatus that

produce heat.

6. Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and

servicing of this TV set. Otherwise, the resulted damage is not protected by the manufacturer.

3

SERVICE MANUAL

Safety Symbol Description The lightning symbol in the triangle tells you that the voltage inside this product may be

strong enough to cause an electric shock. Extreme caution should be exercised when

working on the TV with the back removed.

This is an international hazard symbol, telling you that the components identified by the

symbol have special safety-related characteristics.

FDA This symbol tells you that the critical components identified by the FDA marking have

special safety-related characteristics.

UL This symbol tells you that the critical components identified by the UL marking have

special safety-related characteristics.

C UL This symbol tells you that the critical components identified by the C-UL marking have been

evaluated to the UL and C-UL standards and have special safety-related characteristics.

VDE This symbol tells you that the critical components identified by the VDE marking have

special safety-related characteristics.

MAINTENANCE1. Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from

being accidentally tipped over, pushed off, or pulled off. Do not place the set near or over a

radiator or heat register, or where it is exposed to direct sunlight.

2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations or

impacts.

3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.

4. Slots and openings in the cabinet should never be blocked by clothes or other objects.

5. Please power off the TV set and disconnect it from the wall immediately if any abnormal condition

are met, such as bad smell, belching smoke, sparkling, abnormal sound, no picture/sound/raster.

Hold the plug firmly when disconnecting the power cord.

6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for

cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners.

4

SERVICE MANUAL

ADJUSTMENTS

Set-up Adjustments The following adjustments should be made when a complete realignment is required or a new picture

tube is installed.

Perform the adjustments in the following order:

1. Color purity

2. Convergence

3. White balance

Notes:

The purity/convergence magnet assembly and rubber wedges need mechanical positioning.

For some picture tubes, purity/ convergence adjustments are not required.

1. Color Purity Adjustment

Preparation:

Before starting this adjustment, adjust the vertical sync, horizontal sync, vertical amplitude and

focus.

1.1 Face the TV set north or south.

1.2 Connect the power plug into the wall outlet and turn on the main power switch of the TV set.

1.3 Operate the TV for at least 15 minutes.

1.4 Degauss the TV set using a specific degaussing coil.

1.5 Set the brightness and contrast to maximum.

1.6 Counter clockwise rotate the R /B low brightness potentiometers to the end and rotate the green

low brightness potentiometer to center.

1.7 Receive green raster pattern signals.

1.8 Loosen the clamp screw holding the deflection yoke assembly and slide it forward or backward to

display a vertical green zone on the screen. Rotate and spread the tabs of the purity magnet

around the neck of the CRT until the green zone is located vertically at the center of the screen.

1.9 Slowly move the deflection yoke assembly forward or backward until a uniform green screen is

obtained.

1.10 Tighten the clamp screw of the assembly temporarily. Check purity of the red raster and blue

raster until purities of the three rasters meet the requirement.

5

SERVICE MANUAL

Yoke

Fig. 1

2. Convergence Adjustment

Preparation:

Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.

2.1 Center convergence adjustment

2.1.1 Receive dot pattern.

2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture.

2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue

vertical lines are superimposed each other on the center of the screen.

2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue

horizontal on the center of the screen.

2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line.

2.1.6 Remember red and blue movement. Repeat steps 3) 5) until optimal convergence is obtained.

2.2 Circumference convergence adjustment

2.2.1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting.

2.2.2 Temporarily put the first wedge between the picture tube and deflection yoke assembly. Move

front of the deflection yoke up or down to obtain better convergence in circumference. Push

the mounted wedge in to fix the yoke temporarily.

2.2.3 Put the second wedge into bottom.

2.2.4 Move front of the deflection yoke to the left or right to obtain better convergence in

circumference.

2.2.5 Fix the deflection yoke position and put the third wedge in either upper space. Fasten the

deflection yoke assembly on the picture tube.

2.2.6 Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection

6

SERVICE MANUAL

yoke assembly on the picture tube.

2.2.7 After fastening the three wedges, recheck overall convergence and ensure to get optimal

convergence. Tighten the lamp screw holding the deflection yoke assembly.

Fig. 2

4-pole Magnet Movement 6-pole Magnet Movement

Center Convergence by Convergence Magnets

Incline the Yoke Up (or Down) Incline the Yoke Right (or Left) Circumference Convergence by DEF Yoke

Fig.3

3. White Balance Adjustment

Generally, white balance adjustment is made with professional equipment. It’s not practical to get

good white balance only through manual adjustment. For TVs with I2C bus control, change the bus

data to adjust white balance.

Circuit Adjustments Preparation:Circuit adjustments should be made only after completion of set-up adjustments. Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs with I2C bus control, first change the bus data. 1. Degaussing

A degaussing coil is built inside the TV set. Each time the TV is powered on, the degaussing coil

7

SERVICE MANUAL

will automatically degauss the TV. If the TV is magnetized by external strong magnetic field, causing color spot on the screen, use a specific degausser to demagnetize the TV in the followingways. Otherwise, color distortion will be shown on the screen.

1.1 Power on the TV set and operate it for at least 15 minutes. 1.2 Receive red full-field pattern. 1.3 Power on the specific degausser and face it to the TV screen. 1.4 Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV.1.5 Repeat the above steps until the TV is degaussed completely.

2. Supply Voltage Adjustment

Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B

voltage to the rated voltage.

2.1 Make sure that the supply voltage is within the range of the rated value. 2.2 Connect a digital voltmeter to the +B voltage output terminal of the TV set. Power on the TV and

set the brightness and sub-brightness to minimum. 2.3 Regulate voltage adjustment components on the power PCB to make the voltmeter read 130±1V.

3. High Voltage Inspection

Caution: No high voltage adjustment components inside the chassis. Please perform high

voltage inspection in the following ways.

3.1 Connect a precise static high voltmeter to the second anode (inside the high voltage cap) of the picture tube.

3.2 Plug in the supply socket (220V, AC) and turn on the TV. Set the brightness and contrast to minimum (0 A).

3.3 The high voltage reading should be less than the EHT limitation. 3.4 Change the brightness from minimum to maximum, and ensure high voltage not beyond the

limitation in any case. Nominal EHT voltage:For MCR51R410,MCR51R420,MCR53TF30 is 28 1.5KV: Limited EHT voltage: For MCR51R410,MCR51R420,MCR53TF30 is 30.5KV.

4. Focus Adjustment

Caution: Dangerously high voltages are present inside the TV. Extreme caution should be

exercised when working on the TV with the back removed.

4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on the FBT.

4.2 Power on the TV and preheat it for 15 min. 4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture.

8

SERVICE MANUAL

Before Adjusting After Adjusting

5. Safety Inspection

5.1 Inspection for insulation and voltage-resistant Perform safety test for all naked metal of the TV. Supply high voltage of 3000V AC, 50Hz (limit current of 10mA) between all naked metal and cold ground. Test every point for 3 sec. and ensureno arcing and sparking.

5.2 Requirements for insulation resistance Measure resistance between naked metal of the TV and feed end of the power cord to be infinitywith a DC-500 high resistance meter and insulation resistance between the naked metal anddegaussing coil to be over 20M .

6. SERVICE mode

6.1 To enter the SERVICE mode Set the volume to 0 by the remote control. Then press and hold the MUTE button on the remotecontrol and MENU button on the TV at the same time for over 2 seconds. In the S mode, press the POWER button to quit the S mode.

S

AFW:240Khz 1

( S is red and other items are yellow.)

Use the / buttons on the remote control to highlight an adjustment and the / buttons toadjust it. The POS+/-, / / / ,1~6, RECALL, VOL+/-, MUTE and POWER buttons on the remote control function in the S mode, but 100+, 7, 8, 9 and 0 buttons not.

9

SERVICE MANUAL

6.2 Adjustments and Bus data

Item Symbol Description Bus Data RemarksMENU.00

V.POS /50H VERTICAL POSITION/50Hz 40H.PHASE/50H HORIZONTAL PHASE/50Hz 11V.SIZE/50H VERTICAL SIZE/50Hz 80V.POS /60H VERTICAL POSITION/60Hz 40H.PH/60H HORIZONTAL PHASE/60Hz 15V.SIZE/60H VERTICAL SIZE/60Hz 60V.SC VERTICAL S-CORRECTION 18V,LINE VERTICAL LINE 19V.SIZE CMP VERTICAL SIZE COMPENSATION 7MENU.01

SUB.BIAS SUB-BRIGHT 63SUB.CONT SUB-CONTRAST 63V.KILL VERTICAL KILL 0RF.AGC RF AGC 20R.BIAS RED BIAS 130G.BIAS GREEN BIAS 130B.BIAS BLUE BIAS 130R.DRIVE RED DRIVE 75G.DRIVE GREEN DRIVE 15B.DRIVE BLUE DRIVE 75MENU.02

SECAM B DC SECAM B-Y 9SECAM R DC SECAM R-Y 9S/DVD B.DC S/DVD B-Y 6S/DVD R.DC S/DVD R-Y 6SYNC.KIL SYNC KILL 0H.BLK.L HORIZONTAL BLANKING LEFT 4H.BLK.R HORIZONTAL BLANKING RIGHT 4CROS.B/W CROSSHATCH BLACK/WHITE 0VIDEO.LVL VIDEO LEVEL 7FM.LEVEL FM LEVEL 22MENU.03

FM.MUTE FM MUTE 0AUDIO.MUTE AUDIO MUIE 0VIDEO.MUTE VIDEO MUTE 0DEEM.TC DE-EMPHASIS TIME CONSTANT 0SND.TRAP SOUND TRAP 0

10

SERVICE MANUAL

MENU.04

SUB.COLOR SUB COLOR 63SUB.TINT SUB TINT 32SUB.SHARP SUB SHARP 63AUTO FLESH AUTOMATIC FLESH 0CORING.GAN CORING GAIN 1C.EXT EXTERNAL CHROMA 0C.BYPASS CHROMA BAND-PASS BYPASS 0C.KILL ON COLOR KILL ON 0MENU.05

FIL.SYS FILTER SYSTEM SELECT Y/C FILTER MODE 1COLOR.SYS COLOR SYSTEM 5VOL.FIL VOLUME FILTER 0VIF.SYS VIF SYSTEM 2SIF.SYS.SW SIF SYSTEM SWITCH 0* VIDEO.SW VIDEO SWITCH 1MENU.06

R/B G.BAL R-Y/B-Y GAIN BALANCE 15R/B ANGLE R-Y/B-Y ANGLE 15CD. MODE VERTICAL COUNTDOWN MODE 0GREY MODE GREY MODE V.SETUP VERTICAL SETUP 0MENU.07

BLANK.DEF BLANK.DEFEAT 0BRT.ABL.TH BRIGHT ABL THRESHOLD 1RGB TEMP RGB TEMPERATURE CHARACTERISTICS 1BRT.ABL.DF BRIGHT ABL DEFEAT 1MID.STP.DF BRIGHT MID STOP DEFEAT 1FBP.BLK.SW FBP.BLANKING OR.SWITCH 0MENU.08

DIGITAL.OSD DIGITAL OSD MODE 0OSD.CONT OSD CONTRAST CONTROL? 40OSD.CONTST OSD CONTRAST CONTROL? 0OSD. H.POS OSD HORIZONTAL POSITION 22MENU.09

H.FREQ HORIZONTAL FREQUENCY 46FM.GAIN FM GAIN 0C.KILL.OFF COLOR KILL OFF 0AUDEO.SW AUDEO SWITCH 0T.DISBLE TEST MODE SWITCH DISABLE 1MENU.10

11

SERVICE MANUAL

G/Y ANGLE G-Y ANGLE 0COL KIL OP COLOR KILLER OPERATIONAL POINT 5CBCR-IN YCbCr INPUT or SECAM INPUT 1Y-APF YCbCr ALL PASS FILTER SELECT 0PRE SHOOT PRE-SHOOT SELECT 0WPL OPE WHITE PEAK LIMITER OPERATING POINT 0DC REST DC RESTORATION SELECT 0BK STR STA BLACK STRETCH START 3BK STR GAN BLACK STRETCH GAIN 2MENU.11

OVER MD SW OVER MD SW? 0Y GAMMA Y GAMMA 0FSC C.SYNC FSC C.SYNC? 1VBLK SW V BLANKING CONTROL SW 0SND TRAP SOUND TRAP CONTROL 1HALF TONE HALF TONE LEVEL 3HALF T SW HALF TONE ON/OFF SW 1TST VRESET TST VRESET? 0

MENU.12

E/W DC E/W DC 32E/W AMP E/W AMP 32E/W TILP E/W TILP 32E/W C TOP E/W C TOP 5E/W C BOTM E/W C BOTM 5MENU.13 MENU.13

E/W TEST E/W TEST 7HSIZE COMP HORIZONTAL SIZE COMPENSATION 7IF TEST 3B IF TEST 3B 0V.LEV ADJ VIDEO.LEVEL ADJUSTMENT 0OV MOD LEV OV MOD LEV 5PRE/OVER PRE/OVER SHOOT 0C.VCO SW CHROMA.VCO SWITCH 0C.VCO ADJ CHROMA VCO ADJUSTMENT 3MENU.14 MENU.14

VNSYNC VNSYNC 0TINT.THROU TINT.THROU 0HLOCK.VDET HLOCK.VDET 1

MENU.15 MENU.15

OPT.1CHIP OPT.1CHIP 0

12

SERVICE MANUAL

OPT.VIDEO OPT.VIDEO 1OPT.AV1AV2 OPT.AV1AV2 1 0 for

MCR51R410

OPT.AV3 OPT.AV3 0OPT.S-VHS OPT.S-VHS 0OPT.YUV OPT.YUV 0OPT.COMB OPT.COMB 0OPT.BYPASS OPT.BYPASS 0MENU.16 MENU.16

OPT.VM OPT.VM 0OPT.BLUEBK OPT.BLUEBK 1OPT.V-CHIP OPT.V-CHIP 1OPT.CCD OPT.CCD 1OPT.CLOCK OPT.CLOCK 1OPT.P-ON OPT.P-ON 0X-RAY VOLT X-RAY VOLTAGE 40SRCH.SPEED SEARCH.SPEED 0ROMCORREC

ROM CORRECTION 0

MENU.17 MENU.17

OPT.BTSC OPT.BTSC 0OPT.AV-INP OPT.AV-INPUT 0OPT.BBE OPT.BBE 0SUB.BASS SUB.BASS 3SUB.TREBLE SUB.TREBLE 3OPT.COLOR OPT.COLOR 0OPT.LNG1 OPT.LNG1 0OPT.LNG2 OPT.LNG2 0OPT.LNG3 OPT.LNG3 0MENU.18 MENU.18

LOUDNESS LOUDNESS 9FM/AM.PRES FM/AM.PRESET 63SCART.PRES SCART.PRESET 27SCART.VOL SCART.VOL 117OPT.AVC OPT.AVC 1AVC.DECAY AVC.DECAY 2

Notes:

The data sheet may differ dependent on different models.

The data sheet may differ dependent on different CRTs for the same model.

The items marked with “*” are adjustments used for manufacturing.

13

14

STRUCTURE AND CHASSIS FUNCTION DESCRIPTION 1 Structure Block Diagram

15

2 Block Diagram for Supply Voltage System

16

3 System Control Block Diagram

SERVICE MANUAL

4 Chassis Description

MCR51R410/420/MCR53TF30 These TV uses CN-12C5 chassis which mainly includes a small signal

processor LA76818A microcontroller LC863440/CH04T1232 vertical scan output stage circuit

LA7840 and sound power amplifier TDA7057AQ. The switch power circuit is formed of hybrid IC

STR-G5653. TV/VIDEO and AV input/output are controlled by HEF4053BP and KA2192BV. LA76818A,

a small signal processing chip developed by Japan-based Sanyo, is designed for use in

PAL/NTSC/SECAM televisions, featuring high-integrity, performance & reliability and advanced

functions. With DVD component input, LA76818A improves its performance greatly based on LA76810.

Microcontroller LC863440, also developed by Japan-based Sanyo, is an I2C bus control 8-bit CMOS

single-chip microprocessor. It consists of 48K 8 ROM bit 640 8 RAM bit OSD controller on chip

(36 characters 16lines), remote control signal sensor, PWM output (7bit 3ch), I2C bus serial

interface, featuring high performance and wide usage. The chassis has features of multi system reception and audio/video input/output.

The CN-12C5 chassis series mainly use the following ICs and assemblies.

Table Key ICs and Assemblies

SerialNo.

Position Type Function Description

1 N101 LA76818A Small signal processor

2 D701LC86F3448A/CH04T1232

Microcontroller

3 D702 AT24C04/ST24C04 EEPROM4 N301 LA7840/L Vertical scan output stage circuit 5 N191 TDA7057AQ Sound power amplifier 6 NV01 KA2102B/KA2192B TV/Video switch circuit 7 NK01 HEF4053BP Analog switch circuit 8 N510 STR-G5653 Power supply circuit 9 U101 TDQ-3B8/136 Tuner

17

SERVICE MANUAL

SERVICE DATA1 Technical Data of Key ICs

1.1 Small signal processor LA76818A

a. Block Diagram

Fig.

7

18

SERVICE MANUAL

Pin Function Pin Function

1 Audio Output 54 SIF Input

2 FM Output/Selected Audio Output 53 SIF APC Filter

3 PIF AGC 52 SIF Output

4 RF AGC Output 51 Ext. Audio Input

5 PIF Input1 50 APC Filter

6 PIF Input2 49 VCO Coil 1

7 IF Ground 48 VCO Coil 2

8 IF Vcc 47 VCO Filter

9 FM Filter 46 Video Output

10 AFT Output 45 Black Level Detector

11 Bus Data 44 Internal Video Input (S-C IN)

12 Bus Clock 43 Video/Vertical Vcc

13 ABL 42 External Video Input (Y In)

14 Red Input 41 Video/Vertical Bus Ground

15 Green Input 40 Selected Video Output

16 Blue Input 39 Chroma APC1 Filter

17 Fast Blanking Input 38 4.43MHz Crystal

18 RGB Vcc 37 Clamp Filter

19 Red Output 36 Chroma APC2 Filter

20 Green Output 35 SECAM R-Y Input (Cr input)

21 Blue Output 34 SECAM B-Y input (Cr input)

22 Fsc output/C-Sync output 33 CCD/Horizontal Ground

23 Vertical Output 32 CCD Filter

24 Ramp ALC Filter 31 CCD Vcc

25 Horizontal/Bus Vcc 30 Clock (4MHz) Output

26 Horizontal/AFC Filter 29 VCO IREF

27 Horizontal Output 28 Flyback Pulse Input

b. LA76818A Pin Assignment

19

SERVICE MANUAL

1.2 Microcontroller LC86F3448A/CH04T1232(36 DIP) 1.2.1 Overview

The LC86F3448A are 8-bit single chip microcontrollers with the following on-chip functional blocks: - CPU�Operable at a minimum bus cycle time of 0.424 s- On-chip ROM capacity

Program ROM:32K/28K/24K/20K/16K bytes CGROM:16K bytes

- On-chip ROM capacity: 512 bytes - OSD RAM: 352×9 bits - Closed-Caption TV controller and the on-screen display controller - Closed-Caption data slicer - Four channels×6-bit AD Converter - Three channels×7-bit PWM - 16-bit timer/counter, 14-bit base timer - IIC-bus compliant serial interface circuit (Multi-master type) - ROM correction function - 11-source 8-vectored interrupt system - Integrated system clock generator and display clock generator

Only one X tal oscillator (32.768kHz) for PLL reference is used for both generators TV control and the Closed Caption function All of the above functions are fabricated on a single chip.

20

SERVICE MANUAL

1.2.2 System Block Diagram

Fig.8

1.2.3 Refer to Table 3 about Functions and Service Data of LC86F3448A s Pins.

21

SERVICE MANUAL

1.3 EEPROM AT24C04/ST24C04

1.3.1 Features

·Data EEPROM internally organized as 512 bytes and

32 pages×16 bytes

·Page protection mode, flexible page-by-page

hardware write protection

-Additional protection EEPROM of 32 bits, 1 bit per

data page

-Protection setting for each data page by writing its

protection bit

-Protection management without switching WP pin

·Low power CMOS

·Vcc=2.7 to 5.5V operation

·Two wire serial interface bus, I2C-Bus compatible

·Filtered inputs for noise suppression with Schmitt trigger

·Clock frequency up to 400 kHz

·High programming flexibility

Fig.9-Internal programming voltage

-Self timed programming cycle including erase

-Byte-write and page-write programming, between 1 and 16 bytes

-Typical programming time 6 ms(<10ms) for up to 16 bytes

·High reliability

-Endurance 106 cycles1)

-Data retention 40 years1)

-ESD protection 4000 V on all pins

·8 pin DIP/DSO packages

·Available for extended temperature ranges

-Industrial: -40 to +85

-Automotive” -40 to +125

22

SERVICE MANUAL

1.3.2 Pin Configuration

Fig.10

1.3. 3 Block Diagram

Fig.11

1.3.4 Refer to Table 4 about Functions and Service Data of ST24C04 s Pins.

23

SERVICE MANUAL

1.4 Vertical scan output stage circuit LA7840/L1.4.1 Features

Low power dissipation due to built-in pump-up circuit Vertical output circuit Thermal protection circuit built in Excellent crossover characteristics DC coupling possible

1.4.2 Block Diagram

Fig.12

1.4.3 Refer to Table 6 about Functions and Service Data of LA7840 s Pins.

24

SERVICE MANUAL

1.5 Sound power amplifierTDA7057AQ

1.5.1 Features

DC volume control

Few external components

Mute mode

Thermal protection

Short-circuit proof

No switch-on and switch-off clicks

Good overall stability

Low power consumption

Low HF radiation

ESD protected on all pins.

1.5.2 General Description

The TDA7057AQ is a stereo BTL output

amplifier with DC volume control. The device is

designed for use in TVs and monitiors, but is

also suitable for battery-fed portable

recorders and radios.

Missing Current Limiter (MCL)

A MCL protection circuit is built-in. The MCL

circuit is activated when the difference in

current between the output terminal of each

amplifier exceeds 100 mA (typical 300 mA).

This level of 100 mA allows for single-ended

headphone applications

.

1.5.3 Block Diagram

.

Fig.13

1.5.4 Refer to Table 7 about Functions and Service Data of TDA7057AQ’s Pins.

25

SERVICE MANUAL

1.6 TV/Video switch circuit KA2102B/KA2192B

1.6.1 Features

The KA2102B (NY01) TV/Video switch circuit is an electronic switch circuit controlling four sets of

audio signal inputs, three sets of video signal inputs, two sets of Y/C separation signals inputs, one set

of video signal output, one set of Y/C separation signal output and one set of audio signal output.

1.6.2 Block Diagram

Fig.14

1.6.3 Value Table

Level for Control Terminal

(15) (16)Switchover Mode

H H TV

H L AV1

L H SVHS

L L AV2

1.6.4 Refer to Table 5 about Functions and Service Data of KA2102B/KA2192B s Pins.

26

SERVICE MANUAL

1.7 Analog switch circuit HEF4053BP 1.7.1 Description

The HEF4053 is a triple 2-channel analog multiplexer/demultiplexer with a common enable input (E ).Each multiplexer/demultiplexer has two independent inputs/outputs (Y0 and Y1), a common input/output (Z), and select inputs (Sn). Each also contains two-bidirectional analog switches, each with one side connected to an independent input/output (Y0 and Y1) and the other side connected to a

common input/output(Z). selected (low impedance ON-state) by Sn. With E HIGH, all switches are in the high impedance OFF-state, independent of SA to SC.

VDD and VSS are the supply voltage connections for the digital control inputs (SA to SC and E ).The VDD to VSS range is 3 to 15V.The analog inputs/outputs (Y0, Y1 and Z) can swing between VDD as a positive limit and VEE as a negative limit. VDD-VEE may not exceed 15 V.For operation as a digital multiplexer/demultiplexer, VEE is connected to VSS (typically ground). 1.7.2 Block Diagrams

Fig.15

27

SERVICE , MANUAL

1.7.3 Function Table

InputsE Sn

Channel On

L L Y0n-Zn

L H Y1n-Zn

H X none

Notes

H=HIGH state (the more positive voltage)

L=LOW state (the less positive voltage)

X=STATE is immaterial

1.7.4 Refer to Table 8 about Functions and Data of HEF4053’s Pins.

1.8 Power supply circuit STR-G5653

The Series STR-G5653/F6654 is specifically designed to satisfy the requirements for increased

integration and reliability in off-line quasi-resonant flyback converters. The series incorporates a

high-precise error amplifying control and drive circuit with discrete avalanche-rated power MOSFET,

featuring fewer external components, small-size and standard power supply.

Covering the power range from below 25 watts up to 300 watts for 100/115/230 VAC inputs, and up to

150 watts for 85 to 265 VAC universal input, these devices can be used in a range of applications, from

battery chargers and set top boxes, to televisions, monitors, and industrial power supply units.

Cycle-by-cycle current limiting, under-voltage lockout with hysteresis, over-voltage protection, and

thermal shutdown protects the power supply during the normal overload and fault conditions.

Low-current startup and a low-power standby mode selected from the secondary circuit completes a

comprehensive suite of features. The series is provided in a five-pin overmolded SIP style package,

affording dielectric isolation without compromising thermal characteristics.

(1) Features

Flyback Operation with Quasi-Resonant Soft Switching

for Low Power Dissipation and EMI

Rugged Avalanche-Rated MOSFET

Soft drive circuit MOSFET

Adjustable MOSFET switching speed

Choice of MOSFET Voltage and rDS(on)

Full Over-Current Protection (no blanking)

Under-Voltage Lockout with Hysteresis

Over-Voltage Protection

Direct Voltage Feedback

Low Start-up Current (100 Amax)

Low-Frequency, Low-Power Standby Operation

28

SERVICE , MANUAL

Overmolded 5-Pin Package

(2) Circuit Block Diagram

Fig.16

(3) Pin Configuration and Functions

Dwg MK-003-50

Fig.17

a. Pin function for STR-G5653

29

Pin No. Symbol Function Description1 D MOSFET drain2 S MOSFET source3 GND Ground4 VIN Supply voltage input for control circuit 5 OCP/FB Over-current protection detection signal/ voltage-limiting signal input

SERVICE , MANUAL

b. Pin function for STR-F6654

Pin No. Symbol Function Description 1 OCP/FB Over-current protection detection signal/ voltage-limiting signal input 2 S MOSFET source3 D MOSFET drain4 VIN Supply voltage input for control circuit 5 GND Ground

(4)Difference between STR-G5653 and STR-F6654

a.Different size: STR- F6654 is larger

b.Different pin functions

c.Different electric characteristics: Larger power output, switching current, avalanche-rated and internal

allowable power consumption for STR-F6654

2. Service Data of Key ICs

Table 2 Service Data of LA76818A (N101)’s Pins

GDM8145 MultimeterPin No. Function Description

Voltage(V) Positive Resistance(k ) Negative Resistance(k )

1 Audio Output 2.2 6.82 7.62 FM output/Selected Audio Output 2.41 6.59 486.63 PIF AGC 1.98 6.99 512.74 RF AGC Output 3.73 26.45 PIF Input1 2.84 6.71 296 PIF Input2 2.84 6.717 IF Ground 0 0 08 IF Vcc 5 0.41 0.389 FM Filter 2.22 7.06 0.7610 AFT Output 4.75 5.2811 Bus Data 4.8 14.48 38012 Bus Clock 4.8 5.316 36013 ABL 3.24 7.036 17214 Red Input 0 7.04 17.515 Green Input 0.022 7.02 60.516 Blue Input 0.022 7.03 6.0217 Fast Blanking Input 0.015 3.24 3.218 RGB Vcc 8.234 0.46 0.4519 Red Output 2.8 5.33 6.0520 Green Output 2.96 5.34 6.0721 Blue Output 2.8 5.33 6.05

30

SERVICE , MANUAL

22 Fsc Output/Sync Output 0 10 6.0423 Vertical Output 2.31 2.31 2.324 Ramp ALC Filter 2.786 583.4 6.4525 Horizontal/Bus Vcc 5.188 6.8 4.3426 Horizontal/AFC Filter 2.686 582.2 6.5427 Horizontal Output 0.702 1.41 1.428 Flyback Pulse Input 1.056 22.84 6.1629 VCO IREF 1.71 4.72 4.5230 Clock (4MHz)Output 0.915 4.9 5.01531 CCD Vcc 0 0.49 0.532 CCD Filter 0 4.9233 CCD/ Horizontal Ground 0 0 034 SECAM B-Y Input (Cb Input) 2.375 544 6.27535 SECAM R-Y Input (Cr Input) 2.377 544 6.27336 Chroma APC2 Filter 3.237 582 6.64437 Clamp Filter 1.738 6.6738 4.43MHz Crystal 2.76 350 6.439 Chroma APC1 Filter 3.42 6.5640 Selected Video Output 2.22 6.25441 Video/Vertical Bus Ground 0 042 External Video Output(Y In) 2.6343 Video/Vertical Vcc 5 0.4244 Internal Video Input(S-C IN) 2.5 572 6.35845 Black Level Detector 2.27 0 6.30446 Video Output 3.57 10 5.86547 VCO Filter 2.5848 VCO Coil 2 4.2 1.05449 VCO Coil 1 0 1.0450 APC Filter 2.27 41.7 6.1351 Ext. Audio Input 2.18 24752 SIF Output 2.20 356 10453 SIF APC Filter 2.4 555 485.454 SIF Input 3.16 22.4

31

SERVICE , MANUAL

Table 3 Functions and Service Data of LC86F3448A (D701)’s Pins GDM8145 Multimeter

Ground Resistance (k )Pin No. Function Description Voltage of

Pin (V)

Measure with red probe whilegrounding black probe.

Measure withblack probe whilegrounding red probe.

1 Not connected 1.50 11.8 4.402 Not connected 1.43 12.1 5.203 Bus data line 4.70 11.6 6.204 Bus clock line 4.47 12.1 6.005 Ground 0.00 0.00 0.006 Input terminal for clock oscillating signal 1.78 12.6 5.17 Output terminal for clock oscillating signal 2.88 12.0 4.918 Supply voltage 5.31 7.90 3.729 Button-control voltage input terminal 1 0.02 9.70 5.3410 AFT voltage input terminal 2.47 4.90 5.0811 X-RAY detection input 2.25 6.70 4.5912 Button-control voltage input terminal 2 0.015 8.86 3.8113 Reset 5.27 4.67 1.8814 Character oscillating filter 3.87 1.11 4.9815 Video signal input terminal 3.53 12.3 4.5016 Three bits input/output terminals 0.01 9.76 15.017 Input terminal for vertical flyback pulse 5.07 15.4 18.1

18Input terminal for horizontal flyback pulse

4.62 17.4 18.4

19 R character output terminal 0.015 3.92 3.2920 G character output terminal 0.014 3.95 3.7121 B character output terminal 0.015 3.19 3.6622 Output terminal for fast blanking signal 0.015 6.50 3.6723 Mute 0.015 18.7 17.6224 Standby control 0.015 1.43 7.3025 Not connected 1.23 9.50 6.6526 Control terminal for production modes 4.61 13.0 6.9527 Degaussing circuit control 0.014 3.713 3.4228 Remote control signal input 5.19 12.2 5.3229 Not connected 5.30 12.4 5.4930 Not connected 5.30 12.6 5.4231 Not connected 0.01 12.7 5.3532 Not connected 0.01 12.7 5.3033 Output terminal for on/off control signals 5.30 12.7 6.59

32

SERVICE , MANUAL

34 Output terminal for AV2 on/off control 5.30 11.8 6.3635 Output terminal for AV1 on/off control 5.30 11.4 6.3336 Output terminal for AV0 on/off control 5.29 141.2 6.33

Table 4 Functions and Service Data of AT24C04/ST24C04 (D702)’s Pins DT890D Digital Multimeter

Ground Resistance ( )Negative Resistance(k )

Pin No. Function Description Voltage of Pin (V)

Measure with red probe while

grounding black probe.

Measure with black probe while

grounding red probe.

1 Address input terminal 0.00 0.00 0.002 Address input terminal 0.00 0.00 0.003 Address input terminal 0.00 0.00 0.004 Common ground 0.00 0.00 0.005 Clock line 4.94 6.85 4.836 Data line 4.94 6.89 5.157 PW write protection terminal 0.00 9.58 5.318 Supply voltage 5.32 3.5 3.25

Table 5 Functions and Service Data of KA2102B/K2192B (NV01)’s Pins DT890D Digital Multimeter

Ground Resistance (K )Pin No. Function Description Voltage of

Pin (V)

Measure with red probe whilegrounding black probe.

Measure withblack probe whilegrounding red probe.

1 L TV IN 5.67 6.45 3.532 R TV IN 5.67 6.45 3.743 TV IN 5.67 6.57 4.024 LS IN 5.69 6.45 3.665 RS IN 5.69 6.47 3.726 SY IN 5.54 6.85 3.967 TV SW 0.00 0.00 0.008 SC IN 5.54 6.75 3.859 L1 IN 5.69 6.43 3.3610 R1 IN 5.70 6.37 3.7211 E1 IN 5.56 6.85 3.9612 L2 IN 5.70 6.43 3.87

33

SERVICE , MANUAL

13 R2 IN 5.70 6.33 3.6714 E2 IN 5.56 6.83 4.0115 SW1 5.25 6.84 5.5916 SW2 5.25 6.85 5.5917 MUTE 0.00 0.00 0.0018 Y OUT 3.89 1.418 1.5119 GND 0.00 0.00 0.0020 C OUT 3.84 0.96 1.1521 R OUT 4.37 6.63 3.3522 L OUT 4.37 6.61 3.3123 NC 0.06 6.71 3.9724 Y IN 5.55 6.70 4.1825 SYNC CLAMP 3.47 6.80 5.7526 C IN 5.57 6.67 4.0727 NC 0.25 6.69 4.1328 VCC 9.38 0.34 0.3329 VCC 9.38 0.31 0.3030 V OUT 3.17 6.47 0.48

Table 6 Functions and Service Data of LA7840 (N301)’s Pins

DT890D Digital Multimeter Ground Resistance (K )

Pin No. Function Description Voltage of

Pin (V)

Measure with red

probe while grounding

black probe.

Measure with black

probe while

grounding red

probe.

1 Ground 0 0 02 Vertical output terminal 14.8 365 3603 Pump supply voltage input 24.5 5844 Reference voltage 2.24 660 6005 Inverting input terminal 2.23 800 6726 Supply voltage 24 770 4657 Vertical flyback pulse output terminal 2.25 1167 638

34

SERVICE , MANUAL

Table 7 Functions and Service Data of TDA7057AQ (N191)’s Pins

GDM8145 Multimeter Pin No. Function Description

Voltage (V) Positive Resistance (K ) Negative Resistance (K )

1 Volume control input 0.95 6.85 6.152 Not connected 0.003 Audio R signal input 2.38 12.59 6.514 Supply voltage 17.48 0.47 0.475 Audio L signal input 2.37 12.5 6.516 Ground 0.00 0.00 0.007 Volume control input 0.95 6.85 0.158 Left channel in-phase signal output 8016 6.46 5.599 Ground 0.00 0.00 0.0010 Left channel inverting signal output 8.25 6.46 5.5911 Right channel inverting signal output 8.24 6.46 5.5912 Ground 0.00 0.00 0.0013 Right channel in-phase signal output 8.13 6.46 5.59

Table 8 Functions and Service Data of HEF4053BP (NK01)’s Pins DT890D Digital Multimeter

Ground Resistance (K )

Pin No. Function Description Voltage of Pin (V)

Measure with red probe whilegrounding black probe.

Measure with black probe whilegrounding red probe.

1 Signal input terminal 3.91 6.31 0122 Signal input terminal 5.01 6.31 0.113 Signal input terminal 0.00 0.00 3.414 Signal output terminal 0.02 6.07 0.055 Signal input terminal 0.22 6.17 3.726 Ground 0.00 0.00 0.007 Ground 0.00 0.017 0.008 Ground 0.00 0.017 0.009 Control signal input terminal 4.42 6.27 6.0810 Control signal input terminal 4.42 6.24 6.0711 Control signal input terminal 4.42 6.24 6.0812 Signal input terminal 3.30 6.08 3.6613 Signal output terminal 1.31 5.96 4.7214 Signal input terminal 1.44 5.95 3.6915 Signal output terminal 1.43 6.017 4.0116 Supply voltage 5.04 0.352 0.33

35

SERVICE , MANUAL

3. Replacement of Parts3.1 Description

Many electrical and mechanical components in this chassis have special safety-relatedcharacteristics. Components which have these special safety characteristics in this manualand its supplements are identified by the international hazard symbols or UL,C-UL, FCC, FDA or VDE marking on the circuit diagram and parts list. When replacing any of these components,substitute the one which has the same safety characteristics as specified in the manual. Description of the special markings: A: The components identified by the A marking have special safety-related characteristics. AE: The components identified by the AE marking are listed by EMC and have special

safety-related characteristics. CB: The components identified by the CB marking have been evaluated to the CB standard. E: The components identified by the E marking are listed by EMC G: The components identified by the G marking have critical characteristics. Z: The components identified by the Z marking have important characteristics.

APPENDIX1. Parts List 2. Circuit Board Component Views 3. Schematic Diagrams 4. Printed Circuit Board Diagrams

36

Printed Circuit Board diagrams (1)

MCR51R410 (Main Diagram)Chassis : CN-12C5

Tema: tv rca mod. mcr 51r310 busco manual. (Leído 87 veces)

ricarant

Member

Karma: +2/-0

Desconectado

Sexo:

Profesión o Título: TECNICO EN ELECTRONICA

País: EL SALVADOR CENTRO AMERICA

Mensajes: 26

Re: tv rca mod. mcr 51r310 busco manual.

« Respuesta #5 en: Hoy a las 12:57:07 »

________________________________________

Claro mi migo aqui te mando la secuencia para el modo service : vol a cero, presiona

mute en control remoto y menu en tv al mismo tiempo y ya estas en modo service ojala

y te sirva CON LOS CURSORES UP,DONW CAMBIA PARAMETROS

CURSORES LATERALES CAMBIA VALORES

bueno espero y soluciones tu problema.

saludos desde El salvador