COLOR TELEVISION

LC30B1

CONTENT

Safety instructions………………………………………………………………………..…

Instructions on adjusting and testing…………………………….…….…………………

Trouble shooting……………………………………………………….……………………

Method of software upgrading………..…………………………….………..………….

BLOCK DIAGRAM…………………………………………………………….……………

IC BLOCK DIAGRAM………………………………………………………………………..

Wiring diagram……………………………………………………………..……………....

Serial NO. of parts…………………………………………………………………………….…

Identification criteria for the bright spot and dark spot of the LCD screen………..….

Troubleshooting guide………………………………………………………………..……

Exploded views…………………………………………………………………………..…

Schematic diagram…………………………………………………………………….…..

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1

Safety instructions

1. Instructions 1.1 Be sure to switch off the power supply before replacing or welding any components or

inserting/plugging in connection wire 1.2 Anti static measures to be taken (throughout the entire production process!):

a) Do not touch here and there by hand at will; b) Be sure to use anti static electric iron; c) It’s a must for the welder to wear anti static gloves.

1.3 Please refer to the detailed list before replacing components that have special safety requirements. Do not change the specs and type at will.

2. Points for attention in servicing of LCD

2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to use the screen of the original model for replacement.

2.2 The operation voltage of LCD screen is 700-825V. Be sure to take proper measures in protecting

yourself and the machine when testing the system in the course of normal operation or right after the power is switched off. Please do not

touch the circuit or the metal part of the module that is in operation mode. Relevant operation is possible only one minute after the power is switched off. 2.3 Do not use any adapter that is not identical with the TV set. Otherwise it will cause fire or damage

to the set. 2.4 Never operate the set or do any installation work in bad environment such as wet bathroom,

laundry, kitchen,or nearby fire source, heating equipment and devices or exposure to sunlight etc. Otherwise bad effect will result.

2.5. If any foreign substance such as water, liquid, metal slices or other matters happens to fall into the module, be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short circuit.

2.6. Should there be smoke, abnormal smell or sound from the module, please shut the power off at

once. Likewise, if the screen is not working after the power is on or in the course of operation, the

power must be cut off immediately and no more operation is allowed under the same condition.

2.7. Do not pull out or plug in the connection wire when the module is in operation or just after the power is off because in this case relatively high voltage still remains in the capacitor of the driving circuit.Please wait at least one minute before the pulling out or plugging in the connection wire.

2.8. When operating or installing LCD please don’t subject the LCD components to bending, twisting or extrusion, collision lest mishap should result.

2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it’s necessary to pay attention to anti statics. Before servicing LCD TV make sure to take anti static measure and ensure full grounding for all the parts that have to be grounded.

Attention: This service manual is only for service personnel to take reference with. Before servicingplease read the following points carefully.

2

2.10.There are lots of connection wires between parts behind the LCD screen. When servicing or moving the set please take care not to touch or scratch them. Once they are damaged the screen would be unable to work and no way to get it repaired.

2.11. Special care must be taken in transporting or handling it. Exquisite shock

vibration may lead to breakage of screen glass or damage to driving circuit.

Therefore it must be packed in a strong case before the transportation or

handling.

2.12. For the storage make sure to put it in a place where the environment can be controlled so as to

prevent the temperature and humidity from exceeding the limits as specified in the manual. For

prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in

one place. The ambient conditions are tabulated as follows:

Temperature

Scope for operation 0----+50 C

Scope for storage -20----+60 C humidity Scope for operation 20%---85% Scope for storage 10%---90%

2.13. Display of a fixed picture for a long time may result in appearance of picture residue on the screen,

as commmonly called “ghost shadow”. The extent of the residual picture varies with the maker of LCD screen. This phenonmenon doesn’t represent failure. This “ghost shadow” may remain in the picture for a period of time (several minutes).But when operating it please avoid displaying still picture in high brightness for a long time.

3. Points for attention during installation

3.1. The front panel of LCD screen is of glass. Wheng installing it please make sure to put it in place. 3.2. For service or instatallation it’s necessary to use specified screw lest it should damage the screen. 3.3. Be sure to take anti dust measures. Any foreign substance that happens to fall down between the

screen and the glass will affect the receiving and viewing effect 3.4. When dismantling or mounting the protective partition plate that is used for anti vibration and

insulation please take care to keep it in intactness so as to avoid hidden trouble. 3.5. Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.

Description of adjustment and calibration

2.1 Adjustment and calibration equipment Multi-meter,5515 signal generator and oscilloscope PC set (FLASH writing programs should be installed in place first.), K7253 (VGA and YprPb signal

generator) CA210 (LCD white balancer) and DVD broadcast player.

2.2 Flow of adjustment and calibration

3

See Fig.1.

2.3 FLASH WRITE programs FLASH WRITE memory N9. 2.4 Main board adjustment and calibration

a) Connect main board to infrared receiving board, turn off the power supply adapter switch and insert the plug of power supply adapter output into main board.

b) Turn on power supply adapter, check to see indication lamp in red light and check the power supply and confirm various power supplies as listed below: 1) Main power supply C137 anode 5 V±0.2 V

2) Main power supply C138 3.3 V±0.1 V

3) PW1230 main power supply C142 2.5 V±0.1 V

4) PW113 main power supply L21 1.8 V±0.1 V

5) VPC3230 power for analog terminal L24 anode 5 V±0.2 V

Check if memory U16 has been FLASH written.

Production of main board and TV board on the line.

Check the main board

Check TV board

Combined test for general assembly

Connect to central signal source, check if various TV functions (station skipping, system identification, analogcontrol etc) are normal and check if earphone and speaker output are normal

Input AV/S signal and check various functions under AV/S terminal

Input VGA signal and check if display is normal in the state of PCand various functions (analog control, line/field center etc.

Adjusting and calibrating TV board

Check accessories and then packing

Fig.1 Flow process of adjustment

Input YprPb signal and check if display is normal in the state of PCand various functions (analog control, line/field center etc

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6) Power for liquid crystal screen C159 anode 12 V±0.3 V

7) AD9883A power C410,C17 3.3 V±0.1 V c) Connect VGA line, small conversion board of RS232 electric level and PC set, then run the

program for FLASH upgrading. Turn on the power adapter switch and then the indication lamp of infrared receiving board should be in off state. About 4 minutes later, upgrading is completed and the indication lamp turns red.

d) FLASH write DDC program 2.5 Adjustment and calibration of TV board 2.5.1 Connect main board, TV board and infrared receiving board. Turn on the power supply adapter

switch and the indication lamp of the infrared receiving board will be in green. Measure TV board X2 and PIN3 = 5 V±0.2 V.

2.5.2 Press the menu twice in the TV state to enter the item of sound adjustment. Then move the cursor to the item of equilibrium. Open the cover of remote control set. Press the mute key at the upper left corner and enter the factory menu. Press the menu key again and you can see the preset item of ex-works. Select this preset item and press volume key (+ or -) once to execute the ex-works presetting. The press confirm key to exit the factory menu.

2.5.3 Press channel key +/- to access the ex-works preset channel and check if the screen display is normal.

2.6 Adjustment of white balance(Use white balance meter CA210 and signal generator K7253 specialized for LCD. )

2.6.1 Assemble the complete set. 2.6.2 Press “signal source” key to enter YpbPr. 2.6.3 Input signal YPbPr:640x480p 60 Hz (K7253). 2.6.4 Enter user menu and set the brightness to 50 and contrast to 50. Press factory key to enter

factory menu. Input dark field and execute “black calibration”. The input white field, execute “white calibration” and then finish.

2.6.5 It’s unnecessary to do white balance adjustment for other channels. 2.6.6 For color coordinates, refer to Table 1.

Table 1 Color temperature coordinates Color temperature Color coordinate X Color coordinate Y

9300K 0.281±0.020 0.311±0.020 7300K 0.298±0.020 0.321±0.020 6500K 0.313±0.020 0.329±0.020

3 Performance check

3.1 Station searching function of TV Enter station searching menu→auto station search. Connect RF port to central signal source. After system is set up, check if there is station skipping. Check the semi-auto search and see if the fine adjustment is normal.

3.2 AV/S terminals a) Connect AV and S terminals and check if they are normal. b) Press the video key of the remote control and switch the picture frame

to the state of AV and S-VIDEO. Check if the color is normal and if there are mixed lines, snow

5

flakes, abnormal tremble, interfering patterns or shifting. Plug the earphone line into the earphone port and check to ensure that sound should be heard from both the left and right sound channels.

3.3 YPbPr port Press the video key of the remote control and switch the picture frame to the state of YPbPr. Connect signals 1080I,720p and 480p. Check if the color is normal and if there are mixed lines, snowflakes, abnormal tremble, interfering patterns or shifting. Plug the earphone line into the earphone port and check to ensure that sound should be heard from both the left and right sound channels.

3.4 YcbCr port

a) Connect YcbCr signal and press the key on the remote control to check if the color is normal

and if there are mixed lines, snowflakes, abnormal tremble, interfering patterns or shifting on

the picture.

b) If there is substandard product turned out, make a note on the flow card and route the product

onto the service line.

c) Plug the earphone line into earphone port and check to ensure sound should

be heard from both the left and right channels. d) Furthermore, check if the different functions as listed in the menu are normal. For example, the

adjustment for brightness, contrast, saturation degree, and acutance is normal, alt and bourdon are normal, and language, screen-display position/background and scaler are normal.

3.5 VGA port

Insert the connector of VGA signal. Separately input the three signals of VGA format as listed in

Table 2. After auto calibration is over, check if the display is normal. If there occurs interference on

the picture, press the auto setting key on the remote control once more and check if the display is

normal.

Table 2 VGA display format

Item No.

VGA display format

1 640x480@60 Hz

2 800x600@60 Hz

3 1024x768@60 Hz 4 Preset before ex-works

Enter factory menu in the TV state and then perform setting for ex-works. 5 Packing for ex-works

Check accessories and then packing.

6

Trouble shooting

Before servicing please check to find the possible causes of the troubles according to the table below. 1.Antenna: Picture is out of focus or jumping Bad status in signal receiving

Maybe broadcast signal itself is not good Check if the outdoor antenna is disconnected. Check if the antenna is correctly oriented.

Fringe in picture Check if the antenna is correctly oriented. Maybe there is electric wave reflected from hilltop or building.

Picture is interfered by stripe shaped bright spots

Possibly due to interference from automobile, train, high voltage transmission line, neon lamp etc.

Maybe there is interference between antenna and power supply line. Please try to separate them in a longer distance.

There appear streaks or light color on the screen

Check if interfered by other equipment and if interfered possibly by the equipment like transmitting antenna, non professional radio station and cellular phone.

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2.TV set:

No picture and sound, but only hash.

Check if the antenna cable is correctly connected, or if it has received the video signal correctly.

Symptoms Possible cause Unable to switch the power on Check to see if the power plug has been inserted properly into

the socket. No picture and sound Check to see if the power supply of liquid crystal TV has been

switched on. (as can be indicated by the red LED at the front of the TV set)

See if it’s receiving the signal that is transmitted from other source than the station

Check if it’s connected to the wrong terminal or if the input mode is correct.

Check if the signal cable connection between video frequency source and the liquid crystal TV set is correct.

Deterioration of color phase or color tone

Check if all the picture setups have been corrected.

Screen position or size is not proper Check is the screen position and size is correctly set up. Picture is twisted and deformed Check to see if the picture-frame ratio is properly set up.

Picture color changed or colorless Check the “Component” or”RGB”settings of the liquid crystal TV set and make proper adjustment according to the signal types.

Picture too bright and there is distortion in the brightest area

Check if the contrast setting is too high. Possibly the output quality of DVD broadcaster is set too high. It maybe also due to improper terminal connection of the video

frequency signal in a certain position of the system. Picture is whitish or too bright in the

darkest area of the picture Check if the setting for the brightness is too high Possibly the brightness grade of DVD player(broadcaster)is

set too high. No picture or signal produced from

the displayer if “XXX in search”appears.

Check if the cable is disconnected. Check if it’s connected to the proper terminal or if the input

mode is correct. There appears an indication - “outside the receivable scope)

Check if the TV set can receive input signal. The signal is not correctly identified and VGA format is beyond the specified scope.

Remote control cannot work properly

Check if the batteries are installed in the reverse order. Check if the battery is effective. Check the distance or angle from the monitor. Check if there is any obstruct between the remote control and

the TV set. Check if the remote control signal- receiving window is

exposed to strong fluorescence.

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Blur picture Check if the antenna cable is correctly connected. Of if it has received the right video signal.

No sound Check if the “mute” audio frequency setting is selected. Check if the sound volume is set to minimum. Make sure the earphone is not connected. Check if the cable connection is loose.

When playing VHS picture search tape, there are lines at the top or bottom of the picture.

When being played or in pause VHS picture search tape sometimes can’t provide stable picture, which may lead to incorrect display of the liquid crystal TVIn this case please press “auto” key on the remote control so as to enable the liquid crystal TV set to recheck the signal and then to display correct picture signal

Method of software upgrading

Steps of software upgrading are as follows: 1. Select a serial connection wire and a VGA connection wire and then connect them by means of a

patch panel; 2. Use a serial wire to connect the PC to the patch panel and set TV set to off state;

3. Open the software upgrade file holder and double click

FlashUpgraderNT(use under window 2000/XP/NT)

FlashUpgrader(use under window 98), The following interfaces will show up after running the program:

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Based on the computer features, set up the serial port(COM Port). Select corresponding serial port

(if it’s unable to FLASH WRITE, change to another port). Baud is selected to be 115200. Then select Reset Target After Download. Click FLASH pushbutton, it’s ready to run. For other settings, please refer to the Fig. Above (already defaulted by the system, normally no need to change).

4. Switch on TV set the FLASH write program begins to run;

5. After FLASH write is over, push button “cancel” will become flash. Then shut the main power supply

and it’s OK just switch it on again.

Note: Do not shut the power off or turn the TV set on during the FLASH write. Otherwise it may

lead to no way for flash to rewrite.

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IC Block Diagram

1 PW113(N15) PW113 is the MCU of this TV set and is also its core chip. It communicates with various other chips

by means of bus line 12. The work it performs includes picture scaling (SCALER), receiving of external control signals, sending of various control signals to corresponding signal processing chips so as to complete relevant functions. Picture signal is input through GPORT of PW113 to SCALER for processing. The processed signal is output through GPORT as R,G,B signal and D-HS (line synchronizing), D-VS (field synchronizing), DCLK (82 MHz clock signal) and D-EN (enable signal). The external control signal received by PW113 includes IRIN of Pin203 (signal received by remote control), KEY [2-7] of PORTA (push key control signal) and reset signal etc. Major control signals output from PW113 include backlight control signal BKLON(Pin 40), Panel power supply control signal LCDON(Pin 39), PI5V330 selective control signal VAGSEL(Pin 43), backlight adjustment signal PWMOUT(Pin 200), power amplification mute control signal MUTE(Pin 201), LED lamp control signal LED7(Pin 46, to be high electric level when switched on) and selective signals for certain chips.

Block diagram for PW113 system

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2 PW1230(N11)

The major function of PW1230 is to convert the interlaced video signal into line-by-line video signal so that the picture is clearer and realer and the picture frame becomes finer and smoother. In addition to this conversion function PW1230 is capable of enhancing the image and can also be used to adjust the brightness and contrast of the channel. Nevertheless, the brightness and contrast adjustment function of this TV set is performed by regulating the front end VPC3230. After the digital video signal received by PW1230 from VPC3230 is deinterlaced, it is output as 24bit digital RGB signal to GPORT of N15 PW113 where it is processed. The output signals as DDCK (CLOCK), DDVS (FIELD SYNCHRONIZING), DDHS(LINE SYNCHRONIZING), DDEN (ENABLE SIGNAL) are also basic references for the processing of lower level.

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3 VPC3230(N10) The block diagram of VPC3230 is shown as below:

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In which:

71 pin CIN is signal input for S-VIDEO; 73 pin VIN2 is CVBS input for AV; 74 pinVIN3 is for TV signal input; 75 pinVIN4 is used for synchronous identification of YCRCB. Pins 5,4,6 are respectively used for YCBCR signal input. Pins 62 and 63 are connected to crystal oscillator of 20.25MHz and supply local frequency to

VPC3230. Pins 13,14 are SAF AND SCL signals for bus line 12 to be used for communication with MCU

PW113.

VPC3230 that is used as video decoding chip sends the digital video signal in the format of CCIR601, which is decoded from the analog video signal CVBS,S-VIDEO,YCBCR, to the deinterlacing processor N11 PW1230 where conversion is made from interlace to non-interlace. VINCK, VHREF, VINHS and VINVS sent out by VPC3230 are directly fed to PW1230. 4 SI9933ADY(17)

S1

G 1

D D1 1

P-C hannel M O SFET

S2

G 2

D D2 2

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5 TDA7495(U601) The block diagram of TDA7495 is shown below.

In which Pins 1,5 are for input of left and right sound channels. Pin 9 is control pin when STBY (valid when it is of low electric level). Pin 10 is control pin for MUTE (valid when it is of high electric level). Pin 13 is power supply pin for IC (24V). Pins 12,14 are for power amplification output (output electric level is 10V). For TDA7495, only when two control pins 9 and 10 are valid at the same time can there be sound output. When servicing with power on please take care not to short circuit the IC pin or the power supply because IC is liable to burnout. 6 24LC21(N3)

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7 MSP3450(U5) MSP3450 is an audio processing chip. It has four pairs of audio input ports, which are respectively

TV , PC-AUDIO, HD-R HD-L, AV-R AV-L. The four groups of inputs connected through bus line 12 to PW113 , which control the audio signal corresponding to the output according to different SOURCES.

8 AD9883(N6)

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9 K4S641632C(N12)

10 DS90C383A(N16)

D S 90C 383A /D S 90C F383A

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11 Z86129 (N8)

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12 LVC16244(N13 N14)

13 PI5330(N1)

14 74LV126(N4)

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Serial No. of Parts

Identification criteria for the bright spot and dark spot of the LCD screen

Q’ty allowed Distance between two spots Category criteria

15" 20" 22" 30" 40" 15" 20" 22" 30" 40" One single

spot ≤5 ≤2 ≤5 ≤2 ≤3

2 neighboring

spots ≤2 ≤1 ≤2 ≤1 ≤1

Bright spot

Total No. ≤5 ≤2 ≤5 ≤2 ≤3

≥15mm

One single spot

≤6 ≤7 ≤5 ≤4 ≤10

Two neighboring

spots ≤2 ≤2 ≤2 ≤1 ≤5

Dark spots

Total No. ≤6 ≤7 ≤5 ≤4 ≤10

≥15mm

≥10mm ≥5mm

Total defected point ≤8 ≤7 ≤5 ≤4 / Notes:

1. Definition of defected point (bright spot, dark spot): It is identified as a defected point if its area exceeds 1/2 of a single picture element (R,G,B).

2. Definition of bright spot: It is identified as a bright spot if it is bright in the state of dark field and its bright size remains unchanged

3. Definition of dark spot: It is identified as a dark spot if it is dark in the state of white field and its dark size remains unchanged

4. Definition of two neighboring points: Defects of a group of picture elements(RB,RG,GB).

667-L30B1-83 Signal processing board 667-L30B1-15 Amplifier board 667-L30B1-40 TV board 667-L30B1-09 Remote sensor board 667-L32B1-05 Key board 302-L30B1-01 Power adapter board 535-L30B1-01 Wall mounting parts

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TROUBLESHOOTING GUIDE

NO RASTER yes yes no no no yes no yes yes no

Indicator whetherlight

Replace adapter

Check whetherN25 Pin 7 is highlevel

Replace N25

test X17 pin 1 and 2 and checkwhether the voltage is 12V and24V

Check whether N17 pin5 the voltage 12V Replace

N17

Check X21 pin9.10.11.12.16.17.18.19.20waveform

Replace PANEL

Replace signalprocessing board

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NO PICTURE( HAVE RASTER) Fault 1.VGA and YPBPR no picture yes no no yes yes no no no

Check N1 pin 12waveform

Replace N1 PI5V330

Check R21 R131pin waveform

Replace N6 AD9883

Check R89 pinwaveform

Replace N15 PW113

Replace N16DS90C383A

Check N15 pin 170 waveform Replace G2

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Fault 2. AV S-VIDEO and YCBCR no picture no no yes yes no no no yes yes no no yes

Check R55 R56R57 pin waveform

Check N11 pin62waveform

Replace G1

Replace N10

Check R64 R65 R66 pin waveform

Check R82 R89R93 pinwaveform Replace N16

Check N15pin170 waveform

Replace N15

Replace G2

Check N16 pin40waveform

Replace G3

Replace N11

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Fault 3. TV no picture yes no NO SOUND no no yes yes yes no

Check X4 pin2waveform

Replace TV board

Check fault 2

Check X601 pin 1and 3 waveform

Check whetherU601 pin13 thevoltage 24V

Replace U26

Replace TVboard

Check U5 pin 24and 25 waveform

Check adapterpower

Replace sound ampliferboard

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EXPLODED VIEWS 1

23

45

67

8

9

101112

13

1415

1617

18

19

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NO. NAME NO. NAME

1 Speaker’s front cover 11 Stand base

2 speaker 12 screw

3 Sound-leading part 13 back cover board

4 Speaker’s back cover 14 screw

5 Speaker connector 15 parts of keys

6 Front cabinet 16 back cabinet

7 LCD screen connecting frame 17 Fixing frame

8 LED column 18 main board

9 LCD panel 19 main board frame

10 Signal cable supporter

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

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AC

M_S

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C5256p

Z118.432M

C6333p

C6433p

J10PC-AUDIO

C600.33u

C590.33u

C580.33u

C570.33u

C560.33u

C550.33u

R50510K

R50610K

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R50310K

R50210K

R50110K

1234 5

678VCC

B-outB-inB-inGND

A-inA-inA-out

U26LM358

CJ210u

CK50.1

C651u

C661u

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R9610K

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HD-L HD-R AV-L AV-R

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R520 4.7k

C52047p

R521 4.7k

C52147p+12V

Page: 8

123

TV-SIF16V 470uFCJ5

C511

0.1uF

C5120.1uF

R525100

9V SUPPLY

R516 10K

R517 10K R51810K

R51910K

C65

100n

C66

100n

Name: TV DECODER

VTM

ON

11

VC

C12

SCL

13

SDA

14

ASE

L15

IF-T

V-V

IN21

SIFO

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1 2 3 4 5 6 7 8

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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R60410K

R60510K

5V

5V C61135V 470u

C61535V 470u

X603

X602

C6140.1u

C61625V 1000u

L60375uH VD604

RGP10

R6081/4W 3.6K

D6025Z1

C609

0.1u

C61325V 47u

5V

R609

10KR610

10K

VD603IN4148

V6032SC1015

C61025V 47u

R607

10K

1

1

R6063.3K VD601

5Z1

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AUDIO

X601

J11

0

J9

空

J1空

J40

C60725V 1u

C60825V 1u

L60210uH

L60110uH

C6170.1u

C6120.1u

Page: 9

Name: AUDIO