XOCECO LC-42FE32 Manuel utilisateur

LCD TELEVISION

LC-42FE32

CONTENTS

Safety precautions………………………………………………………………………..…

Alignment instructions …………………………….…….…………………………………

Working principle analysis of the unit……………………………….………….………….

Block diagram …………………………………..………………………………….…………

IC block diagram………………………………………………………………………..……

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

Troubleshooting….…..………………………………………………………………..……

Schematic diagram…………………………………………………………………………

APPENDIX-A: Assembly list

APPENDIX-B: Exploded View

Safety precautions

1. Instructions

Be sure to switch off the power supply before replacing or welding any components or

inserting/plugging in connection wire 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.

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.

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

Attention: This service manual is only for service personnel to take reference with. Before

servicing please read the following points carefully.

would be unable to work and no way to get it repaired.

If the connection wires, connectors or components fixed by the thermotropic glue need to disengage

when service, please soak the thermotropic glue into the alcohol and then pull them out in case of

damage.

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 oC

Scope for storage -20 ~ +60 oC

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 commonly called “ghost shadow”. The extent of the residual picture varies with the

maker of LCD screen. This phenomenon 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. When installing it please make sure to put it in place.

3.2 For service or installation 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.

Alignment instructions

1. Test equipment

Digital Multi-meter

54200 (Signal generator)

PC (FLASH writing programs have to be installed first, W24CXX.EXE)

VG849 (HDMI signal generator)

CA210 (White balancer)

DVD player (with HDMI output)

Monitor

2. The alignment flow chart (see below figure)

Fig.1 Flow process of alignment

Production of main board, high frequency board,

other little board, power board on the line.

Input VGA signal, check if display is normal in

the state of PC and various functions (analog

control), line/ field center etc. the picture and

sound of AV-OUT should be the picture and

sound of the current channel

Combined test for general assembly

Input HDMI and DVI signal (use a connection

wire, input audio signal from D-sub Audio in),

check if HDCP KEY, picture and sound are

normal. the picture and sound of AV-OUT should

be the picture and sound of the current channel

High frequency board test

Check accessories and then packing

Input YPbPr/YCbCr 1/2 signal and check if

picture, sound and analog quantity control is

normal in the state of COMPONENT. the picture

and sound of AV-OUT should be the picture and

sound of the current channel

FLASH write N5, N9, N13, N24

Main board test

Test of Button board and IR board

Aging

ADC emendation and white balance adjustment

Connect to central signal source, check

various TV functions (station search, system

identify, modulate quantity control etc), check if

the output of earphone and speaker are normal

Picture and sound of AV-out is normal. (check

stereo/SAP and CCD, VCHIP for America) .

Input AV1/S/AV2 signal, check various functions

under each terminal (system identify, analog

control etc), check if Picture and sound of AV-out

is normal. (S-terminal and AV1 share the same

audio channel, the output picture from AV-out is

the picture of AV1 in the status of S-terminal)

3. Flash writing programs

Flash write N5, N9, N13, N24

Flash write W24CXX.EXE to N13, N24 with self-made flash write tool on the line.

Note: software upgrade of N5 from socket X51

software upgrade of N9 from USB interface

software upgrade of N13, N24 from HDMI and VGA interface separately

Adjustment of main board and high frequency board

a) Connect the main board and high frequency board according the wiring diagram. Connect X402

(on main board) with IR board and insert the plug of power supply assy into X707, now the

indicator light of IR board is red.

b) Press POWER button on the remote control set, now the indicator light of IR board is blue.

c) Check if picture and sound are normal of all the channels, if STEREO/SAP can be identified

correctly. Check AV-OUT function: the picture and sound of AV-OUT should be the picture and

sound of the current channel at TV/AV1/S/AV2; the sound from AV-OUT should be the sound of

the current channel at the other signal source, while the picture don’t need to check.

4. Unit adjustment

4.1 Adjustment of unit connection

Turn on the TV and check if it is normal: display LOGO about 8 seconds later, display picture about

12 seconds later.

4.2 Aging

a) Turn on the TV, select TV channel without signal input.

b) Aging for an hour in the aging room.

4.3 ACD calibration and White balance adjustment (use CA210, VG849 generator)

Method of entering factory menu: enter “INPUT” menu, then press”2 5 8 0” one by one.

Note: Coordinate of cold color temperature 9300K is (X=283, Y=299), coordinate of warm color

temperature 6500K is (X=311, Y=329).

YPbPr channel (YPbPr1 or YPbPr2)

a) Input SMPTE COLOR BAR signal of 480P (TIMING:976, PATTERN:984)

b) Set brightness to 50; contrast to 50

c) Enter factory menu and perform “Calibration”

VGA channel

a) Input 16-level gray scale signal of the mode 800*600 @60 (TIMING:885, PATTERN:920)

b) Set brightness to 50; contrast to 50

c) Enter factory menu and perform “Calibration”

d) Select “color temperature” of “COOL”

e) Enter “color temperature setting” menu

f) Fix GREEN GAIN at 128, adjust RED GAIN, BLUE GAIN to set the color coordinates of

fourteenth level to (X=283, Y=299).

g) Set the color coordinates of warm color temperature (WARM) to (X=311, Y=329) using the

same method.

h) Check if the color coordinates of the cool/warm color temperature at YPbPr (include 480i,

480P, 720P, 1080i), VIDEO(NTSC, PAL) and TV channels are within the scope of the

corresponding value (permit ±8 error).

5 Functional Inspection

5.1 TV function

Connect RF terminal to the central signal source, Enter Search menu →auto search, check if there

is station skipping. Check if Fine Tune, the output of earphone and speakers, and the picture are

normal. Check STEREO/SAP/CCD/Parent Control and the picture and sound from AV-OUT.

5.2 ATSC function

Connect AIR terminal to the central signal source, press INFO button and check if the information is

right. Open EPG table and do the same check. Open CCD, V-CHIP and check the display.

5.3 AV/S-Video terminal

Separate input AV1/S/AV2 signal, check if they are normal. Check if the picture and sound from

AV-OUT is normal. It should auto-jump to S terminal when insert S-terminal at the status of AV1.

5.4 VGA terminal

Input VGA signal (VG849 signal generator), separate input the VGA format signal of table 1 and

check if the display and sound are normal. If the image is slight disturb, press auto correction button

on the remote control and check the display.

Table1 PC signal format

No Resolution H-frequency(kHz) V-frenquency(Hz) Point clock pulse

frenquency(MHz) Remark

1 720×400 31.47 70.08 25.17 DOS

2 640×480 31.50 60.00 25.18 DOS

3 640×480 37.90 72.00 31.50 Mac.(SOG)

4 640×480 37.50 75.00 31.50 VESA

5 640×480 43.30 85.00 36.00 VESA

6 800×600 35.16 56.25 36.00 VESA

7 800×600 37.90 60.00 40.00 VESA

8 800×600 46.90 75.00 49.50 VESA

9 800×600 48.08 72.19 50.00 VESA

10 832×624 49.00 74.00 57.27 Mac.(H+V)

11 1024×768 48.40 60.00 65.00 VESA

12 1024×768 56.50 70.00 75.00 VESA

13 1024×768 60.00 75.00 78.75 VESA

14 1280×1024 64.00 60 108.00 SXGA

15 1280×1024 80.00 75 135.00 SXGA

5.5 YPbPr terminal

Input YPbPr signal (VG849 signal generator), separate input the format signal of table 2, check if

the image and sound is normal. If the image is slight disturb, press auto correction button on the

remote control and check the display.

Table 2 Component mode

No Resolution H-frequency(kHz) V-frenquency(Hz) Point clock pulse

frenquency(MHz) Remark

1 720×480 15.734 59.94 13.5 480i(NTSC)

2 720×576 15.625 50 13.5 576i(PAL)

3 720×480 31.469 59.94 27 480p(NTSC PROG)

4 720×576 31.25 50 27 576p(PAL PROG)

5 1280×720 45 59.94 74.18 720p(59p)

6 1280×720 45 60 74.25 720p(60p)

7 1280×720 37.5 50 74.25 720p(50p)

8 1920×1080 33.75 59.94 74.25 1080i(59i)

9 1920×1080 33.75 60 74.25 1080i(60i)

10 1920×1080 28.125 50 74.25 1080i(50i)

5.6 HDMI terminal

Input HDMI signal (VG849 signal generator), separate input the format signal of table 3 and table 4.

Check if the image and sound is normal. Input DVI signal through DVI-HDMI trans-connection wire,

input audio signal from DVI/VGA AUDIO and check if it is normal.

Table 3 HDMI signal format

No H-frequency(kHz) V-frenquency(Hz) Remark

1 15.735 60 SDTV 480i

2 15.625 50 SDTV 576i

3 31.47 60 SDTV 483p

4 45.00 60 HDTV 720p

5 33.75 60 HDTV 1080i

Table 4 HDMI audio signal format

Channel 2

Sampling frequency 32 Kbit/s, 44.1 Kbit/s, 48 Kbit/s

Wide 16 bit, 20 bit, 24 bit

6 Ex-factory preset

Enter the factory menu in the status of TV, then perform the ex-factory preset.

7 Packing

Check the accessories and then packing.

Working principle analysis of the unit

1. Video signal flow (see below figure)

TV VIDEO signal(TV1, TV2) output from TUNER1 and TUNER2 is divided into two ways, one way

is sent to PW328 process of main-picture; another way is sent to TVP5147 process of sub-picture.

Likewise, analog video signal of AV1, AV2, Y/C is divided into two ways and separate sent to

PW328 and TVP5147 to do the same process. In addition, 44MHZ digital IF signal output from

TUNER1 is sent to N717 demodulating for TS(0:7), then it send to PWM2000 to do the

corresponding process, then switch to RGB of 30bit output to PW328, the signal of TV1,TV2, AV1,

AV2, Y/C input into TVP5147 digital processing and convert into 20bit YC signal output to PW328;

while digital signal of YPbPr1,YPbPr2 and VGA send straight to PW328. The differential signal of

HDMI-1 and HDMI-2 via HDMI receiver SIL9011 after, demodulate 30bit RGB signal output to

PW328 too. The all signal input into PW328 digital processing then send to LVDS level drive for

LCD panel. In addition, TV1, TV2, AV1 and AV2 via QS3257 select after, send to X704 for output of

video.

Tuner 1

Tuner 2

Tuner 1

V-out

AV 1

AV 2

YCbCr

YPbPr 1

YPbPr 2

VGA

HDMI-1

T312

VSB/QAM

Demodulator

3257

TVP5147

PWM328

SiL9011

TV1

TV2

30-BIT RGB

20-BIT Y/C

LVDS

30-BIT RGB

PWM2000

HDMI-2

2. Audio signal flow (see below figure)

SIF1, SIF2 of TUNER1 and TUNER2 send straight to MSP4440G demodulate of MTS. The signal

and the sound of AV1, AV2, VGA and YPbPr1, YPbPr2(via PIV331 to select signal),send to

MSP4440G select output. CL/WS of HDMI-1, HDMI-2 and digital MEPG_CL/WS demodulated from

PWM2000 via 3257 select after, it send to MSP4440G, while the data D1 and D2 of HDMI and

PWM2000 send straight to MSP4440G. IIS and the audio signal of each channel are demodulated

in MSP4440G then sent to TPA3008 amplify and output. The audio signal of TS stream may be

demodulated and converted into SPDIF to output in PWM2000 at the same time.

Audio out

Tuner 2

Tuner 1

AV 1

AV 2

YPBPR 1

VGA

YPBPR 2

MSP4440G

PIV331

PWM2000

3257

SiL9011

SIF1

SIF2

IIS D1

Mepg cl/ws

Hdmi cl/ws

IIS D2

HDMI-2

HDMI-1

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