Xoceco LC-42HW36, LC-47HW36 Schematic

LCD TELEVISION

LC-42/47HW36

CONTENTS

Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….………………………………… Method of software upgrading…………………………………………………………….. Working principle analysis of the unit……………………………….………….…………. Block diagram…………………………………..………………………………….………… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………………………. Troubleshooting guide ………………………………………………………………..…… Schematic diagram………………………………………………………………………… APPENDIX-A: Assembly list APPENDIX-B: Exploded View

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Note: This maintenance manual is intended only for the reference of the maintenance people. Please pay attention to the following points before carrying out the maintenance work.

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

would be unable to work and no way to get it repaired. If the connection wires, connections 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 dagmage.

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. Alignment equipment

PM5515 (video signal generator) VG-848/VG-849 (YUV, VGA, DVI/HDMI signal generator) CA210 (white balancer)

2. Alignment flow-chart

The alignment flow-chart is shown as fig-1

Connect with central signal source, then check each function of TV such as

station leaking, analog control etc., check the output of headphone and speaker

Input AV/SVIDEO signal, then check each function of all the terminals

Input VGA, HDMI signal, check if the display is normal, check eac

function such as analog control etc., check horizontal /vertical center etc.

3. Adjusting instruction

3.1 Unit adjustments

Connect all the boards according the wiring diagram, then power on and check if the display is normal. The method for using factory menu: First press the “source” button, then press the “2580“ buttons to enter factory menu. Press the “SLEEP” button to select the adjustment page menu, press ▲and ▼to select item, press ◄and ►

Check if DDC and FLASH are flash written

To produce digital board and analog board

All testing

White balance adjustment

Input HD signal then check each function of the terminal

Preset ex-factory

Check the accessories and pack them in box

Fig-1 adjustment flow-chart

to adjust the value, press “MENU” button to exit the factory menu. If the unit does not turn off, you can press the “SLEEP” button to enter factory menu again. Turn off the unit to exit the factory menu.

3.2 EEPROM initialization

Enter page one of the factory menu, select the EEPROM INITIALIZE to ON, turn off the unit then turn on again. Note: it needs a little long time to display the LOGO after turn on again.

3.3 White balance adjustment

The 16 level gray-scale signal (DVI:TIMING978 PATTAN921, HDMI:TIMING853, PATTERN992) sends to DVI/HDMI channel from VG-848/VG-849, enter S.Magic sub menu of the user menu and set “PWM” and “Sensor” to off, then enter the factory menu white balance adjustment page. Select the normal color temperature item, fixed GGAIN to be 128, adjust B, RGIAN to let the third color coordinate on the right be (280, 290 )at 400nits; fixed the GOFFSET to be 128H, adjust B, ROFFSET to let the third color coordinate on the left be (280,290) at 5 nits. Select the cool color temperature, adjust the color coordinate be (270, 283). Select the warm color temperature, adjust the color coordinate be (300, 310). After adjustment, switch to AV, VGA and YPbPr and have a check. If there is some deviation in some channel, please adjust it independently. Note: after adjust the white balance in HDMI, it will store the adjusted data to other channels.

4 Performance check

4.1 TV function

Connect RF-TV terminal to the central signal source and enter the setting menu, set the country category, then enter the search menu → auto search, check if there is station skipping. Check the manual search, fine turning, the output of speaker and earphone and picture. Open the PIP and POP modes, connect the earphone and check the display and sound.

4.2 AV/S-video input terminal

Input AV/S signal, check if the picture and sound is normal. Open the PIP and POP modes, connect the earphone and check the display and sound.

4.3 YPbPr /YCbCr terminal

Input the YUV signal (VG-848 signal generator), separate input YUV format signal of table 1, check if the image and sound is normal. If the image is deflection of the H-field, select auto sync correction of the SCREEN menu. If the image is slight disturb, adjust the FINE TUNE correction of the SCREEN menu. Open the PIP mode, connect the earphone, and check if the image and sound is normal.

Table 1 YUV format signal

No H-frequency (KHz) V-frequency (KHz) Signal

15.734 59.94 SDTV 480i

31.469 59.94 HDTV 480p

44.955 59.94 HDTV 720p

33.716 59.94 HDTV 1080i

67.5 60 HDTV 1080P

15.625 50 SDTV 576i

31.25 50 HDTV 576p

37.5 50 HDTV 720p

33.75 50 HDTV 1080i

56.25 50 HDTV 1080P

4.4 VGA terminal Input the VGA signal (VG-848 signal generator), separate input VGA format signal of table 2, check if the image and sound is normal. If the image is deflection of the H-field, select auto sync correction of the SCREEN menu. If the image is slight disturb, adjust the FINE TUNE correction of the SCREEN menu. Open the PIP mode, connect the earphone, and check if the image and sound is normal.

4.5 HDMI terminal

HDMI signal format receive the three high definition signal: 480P, 576P, 720P/50/60Hz, 1080I/50/60Hz, 1080P/50/60Hz except for the table 2 signal. Check if the image (contain HDCP ON and OFF) and sound is normal (use VG-849 generator). If the image is deflection of the H-field, perform manual correction of the SCREEN menu. Open the PIP mode, connect the earphone, and check if the image and sound is normal. Input DVI audio signal and check if it is normal.

Table2 VGA signal format

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

Point clock pulse

frenquency(MHz)

Remark

1 720x400 31.469 70.086 28.322 IBM

640x480 31.469 59.94 25.175 IBM

3 640x480 37.861 72.809 31.5 VESA

4 640x480 37.5 75 31.5 VESA

640x480 43.269 85.008 36 VESA

6 800x600 35.156 56.25 36 VESA

800x600 37.879 60.317 40 VESA

8 800x600 48.077 72.188 50 VESA

800x600 46.875 75 49.5 VESA

10 800x600 53.674 85.061 56.25 VESA

1024x768 48.363 60.004 65 VESA

12 1024x768 56.476 70.069 75 VESA

13 1024x768 60.023 75.029 78.75 VESA

14 1280x1024 63.98 60.02 108.00 VESA

15 1024x768 68.667 84.98 94.486 VESA

4.6 Ex-factory setting

Table3 Factory Option Menu

Item Setting

IIC Bus-off

Enter Update Mode

EEPROM Initialize Off

Backlight Adjustable Off

Back Light 0

ShowLogo On

Hotel Mode Off

Direct Power On Off

Channel switch blank On

Preset Programs Off

Note: Back Light, Hotel Mode, Direct Power On have no function temporarily.

Table4 Factory Audio Setting

Item Setting

Volume 1 85H

Volume 25 B2H

Volume 50 C7H

Volume 75 D8H

Volume 100 ECH

Prescale_TV 42H

Prescale_Others 50H

Prescale_HDMI 78H

AIS_ADC_GAIN 05H

Main pic Hp F6H

HP VOLUME SETTING

Volume 1 50H

Volume 25 ABH

Volume 50 B9H

Volume 75 C7H

Volume 100 D6H

Table5 Factory Video Limit Setting

Item CVBS D-SUB YPbPr HDMI

Brightness Min 80H 60H 70H 70H

Brightness Mid 90H 80H 85H 90H

Brightness Max B0H A0H A0H B0H

Contrast Min 50H 70H 50H 50H

Contrast Mid 70H 90H 70H 70H

Contrast Max 85H B0H 85H 85H

Sharpness Min 40H 40H 40H 40H

Sharpness Mid 60H 60H 60H 60H

Sharpness Max 80H 80H 80H 80H

Color Min 00H 00H 00H 00H

Color Mid 40H 40H 40H 40H

Color Max 80H 80H 80H 80H

Hue Min 00H 00H 00H 00H

Hue Mid 40H 40H 40H 40H

Hue Max 80H 80H 80H 80H

Table6 White Balance Adjust

Item CVBS D-SUB YPbPr HDMI

R Offset 119 119 119 119

G Offset 128 128 128 128

B Offset 123 123 123 123

R Gain 129 129 129 129

G Gain 128 128 128 128

B Gain 115 115 115 115

Color Temperature Standard

R Offset 120 120 120 120

G Offset 128 128 128 128

B Offset 121 121 121 121

R Gain 123 123 123 123

G Gain 128 128 128 128

B Gain 126 126 126 126

Color Temperature Cold

R Offset 118 118 118 118

G Offset 128 128 128 128

B Offset 126 126 126 126

R Gain 141 141 141 141

G Gain 128 128 128 128

B Gain 95 95 95 95

Color Temperature Warm

Table7 Picture Setting

CVBS Dynamic Standard Mild Custom

Contrast 90 80 50 50

Brightness 60 50 40 50

Colour 70 60 40 50

Tint 0 0 0 00

Sharpness 60 50 30 50

D-SUB Dynamic Standard Mild Custom

Contrast 90 80 50 50

Brightness 50 40 30 50

Colour 70 60 40 50

Tint 0 0 0 00

Sharpness 60 50 30 50

YPbPr Dynamic Standard Mild Custom

Contrast 90 80 50 50

Brightness 50 40 30 50

Colour 70 60 40 50

Tint 0 0 0 00

Sharpness 60 50 30 50

HDMI Dynamic Standard Mild Custom

Contrast 90 80 50 50

Brightness 50 40 30 50

Colour 70 60 40 50

Tint 0 0 0 00

Sharpness 60 50 30 50

Note: You can set the value of the picture and sound mode at the factory menu. In other situation, the

changed value will be store in Custom mode.

Table8 Audio Setting

User Surround Music Movie

Treble 50 50 80 60

Bass 50 50 80 80

4.8 Ex-factory setting of user menu

1) select TV channel

2) video menu, Mode: Standard, colour temperature: nature

3) audio menu, Volume: 20, Balance: 00, Earphone volume:20, Mode: user, BBE: off, AVC: off

4) screen menu, Mode: Auto

5) station menu, Color mode: Auto, Sound mode: DK

6) setting menu, Child Lock: Off, Language: Chinese, OSD transparency :7, OSD time out: 15s, Blue Screen: On. Note: the 4) and 5) items should be set according to clients require. The user menu may be different depending on the clients.

Method of software upgrading

1. Software install instrument a) Double click “PXSDKToolkitV1.0.5” to install the upgrade flat. b) Execute “ISPWriter3.exe” to enter IAP program.

2. Instrument

Upgrade board (667.42HW36-90), USB wire (one male terminal and one mini terminal), VGA cable(665.D0002-510 with pin4 and pin11).

3. Upgrade method when the unit is normal a) Click “ISPWRITER3” icon on the desk to open the upgrade software, click “OPEN” of the

tool bar to begin communication, enter the factory menu and select “Enter Update Mode” of the first OSD page to enter the upgrade mode.

b) Click “BIN” of the tool bar and select the upgrade software, click “PROG” on the tool bar to

begin upgrade.

3. BIN 5. PROG

Select the upgrade software

c) The upgrade is over when appear “ISP OVERFLOW”, click “Reboot” of the tool bar to

start-up the unit, then the upgrade is complete.

6. Reboot

4. Upgrade method when the unit can’t power on normally.

Click “ISPWRITER3” icon on the desk to open the upgrade software, click “OPEN” on the tool bar to begin communication, then click “DIAL” on the tool bar to test the state of the unit, power on the unit now to enter the upgrade automatically, then perform according 3), 4).

1. OPEN 2. DIAL

Working principle analysis of the unit

1. Analog signal

Antenna reception signal RF will be sent to integrative tuner (contain HF and IF amplifier circuit), the tuner is controlled by the command (SDA and SCL) of the MCU N801(M16C), select appropriate channel to system switch, via HF amplifier and IF amplifier decode, output video signal CVBS and second sound signal SIF. AV1, AV2 audio signal(AV1 and S-Video share the same audio channel), YPbPr1, YPbPr2 audio signal, D-SUB/DVI audio, USB/PVR audio, HDMI and SIF are sent to N103(SGTV58xy audio process and volume control) for audio switch, the selected audio signal is separated into left and right channel and sent to digital audio amplifier N106(TPA3120) to amplify, then sent to speaker.

CVBS, AV1, AV2, S-Video signal (Y signal of S-Video and AV1 video share the same channel), USB or YUV signal of PVR mode and D-SUB signal via matched resistance, the signal separately through alone channel send to main IC NS01 (SVP-WX68) video switch, A/D transition, digital decode, image scale and OSD superposition, then send to LVDS level drive for LCD screen.

Video signal of YPbPr1, YPbPr2 via matched resistance to video switch NB05 (PI5V330), after switch the select signal will be sent to main IC NS01 (SVP-WX68) video switch, A/D transition, digital decode, image scale and OSD superposition, then send to LVDS level drive for LCD screen.

2. Digital signal

HDMI1, HDMI2, HDMI3 digital signal via digital video switch NA04(PS301), select one signal to send to main IC NS01 (SVP-WX68) video and audio separate first, video signal via digital decode, image scale and OSD superposition to output LVDS level drive for LCD screen; digital audio signal I2S will be sent to N103 (SGTV58xy audio process and volume control).

Block diagram

IC block diagram

1. DPTV-SVP-WX68

32bit 256MHz

Video signal from TUNER1, AV, RGB signal, Y and C signal, YUV, YPbPr signal via matched resistance, the signal separately through alone channel send to main IC NS01(SVP-WX68) video switch, A/D transition, digital decode, image scale and OSD superposition, then send to LVDS level drive for LCD screen. It can realize the functions of PIP, POP and Multi-window in N101.

2. SGTV58xy

Audio signals and SIF are sent to N103(SGTV58xy) for stereo decode and AVC. SGTV58xy has ten input channels for analog audio, audio of AV1. AV2 (AV1 and S-Video share the same audio channel),YPbPr1, YPbPr2, D-SUB/DVI, USB/PVR are sent to N103, the signals are switched inside the IC by the control of the software, the selected audio output through three ways. One way via volume, treble and bass control, sound effect processing, then separate to left and right channel and send to digital sound amplifier N106(TPA3210) amplifying, then send to speaker; one way also separate to left and right channel and send to earphone amplifier N104(NJW1109) for volume control and amplify, then send to earphone socket; the other way send to AV OUT.

Pin Description 92, 93: SDA, SCL 37, 38: left/right channel output to sound amplifier 34, 35: left/right channel of earphone 32, 33: AV OUT (right/left) 43, 44: USB audio (right/left) 51, 52, 47, 48: YPbPr 1,2 audio (right/left) 53, 54, 49, 50: AV IN (right/left) 57, 58: VGA audio (right/left) 59, 60: TV MONO 81: TV SIF input

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