Xoceco LC-26FB26-TV Schematic

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LCD TELEVISION

LC-26FB26

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

26 35

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

servicing please read the following points carefully.

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, 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 dagame.

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

PM5515 (video signal generator) VG-849 (YUV, VGA, HDMI signal generator)

CA210 (white balancer)

2. The alignment flow chart (see below figure)

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

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

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

Input HD signal (format), then check each function of the terminal

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

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

3. Description of adjustment

3.1 Unit adjustment

To produce digital board and analog board

Check the accessories and pack them in box

Check DDC and FLASH

All testing

Adjust white balance

Preset ex-factory

Fig-1 adjustment flow-chart

Connect the digital board, analog board, video processing board, button board and remote control receiver board according to the wiring diagram 203-L27FB18-01JL or 203-L32FB18-01JL. Connect with power and observe the display.

Method for using factory menu: press ”VOL” button to decrease the volume to 0, then press”9876” to enter level one factory menu. Press ”CH+” and “CH-“ to select adjustment page, then press “OK”

to access. Press “CH+” and “CH-“ to move cursor up and down, when the cursor stays on a certain adjustment item, press “VOL-“ and “VOL+” to adjust. Press “MENU” exit to the level one factory menu; press “EXIT” to exit from the factory menu at any situation.

Note: channel switch isn’t available at adjustment menu, only after return to level one factory menu, you can switch channel.

3.2 adjustment of white balance

3.2.1 input 16 level gray-scale signal from VG849 to HDMI channel (TMIING: select a support format of HDMI), enter white balance adjustment page of factory menu, select cool color temperature of item, fixed WBGG_HDMI to 50H, adjust WBRG_HDMI, WBBG_HDMI, let the color coordinate of third level on the right be (270,283) at 400nits; fixed WBBO_HDMI to 50H, adjust WBRO_HDMI, WBGO_HDMI, let the color coordinate of third level on the left be (270,283) at 5nits. The brightness of 400nits and 5nits may obtain by adjusting the contrast and brightness of menu.

3.2.2 input 16 level gray-scale signal from VG849 to AV channel (TMIING:968), enter white balance adjustment page of factory menu, select cool color temperature of item, fixed WBGG_NTSC to 50H, adjust WBRG_NTSC, WBBG_ NTSC, let the color coordinate of third level on the right be (270,283) at 400nits; fixed WBBO_ NTSC to 50H, adjust WBRO_ NTSC, WBGO_ NTSC, let the color coordinate of third level on the left be (270,283) at 5nits. The brightness of 400nits and 5nits may obtain by adjusting the contrast and brightness of menu.

3.2.3 input 16 level gray-scale signal from VG849 to VGA channel (TMIING: select a support format of VGA), enter white balance adjustment page of factory menu, select cool color temperature of item, fixed WBGG_VGA to 128, adjust WBRG_ VGA, WBBG_VGA, let the color coordinate of third level on the right be (270,283) at 400nits; fixed WBGO_VGA to 128, adjust WBRO_VGA, WBBO_VGA, let the color coordinate of third level on the left be (270,283) at 5nits. The brightness of 400nits and 5nits may obtain by adjusting the contrast and brightness of menu.

3.2.4 input 16 level gray-scale signal of 480I from VG849 to YPbPr channel, enter white balance adjustment page of factory menu, select cool color temperature of item, fixed WBRG_YPbPr480I, WBGG_YPbPr480I, WBBG_YPbPr480I to 128, and WBRO_YPbPr480I to 128, adjust WBRO_YPbPr480I, WBBO_YPbPr480I, let the color coordinate of third level on the left be (270,283) at 5nits. The brightness of 5nits may obtain by adjusting the contrast and brightness of menu.

Input format signals separately list on table 1, repeat the operation above until the white balance pass muster.

Note: the white balance adjustment of VGA and YPBPR must be done at the situation that the white balance adjustment of HDMI is accurate.

4 Performance check

4.1 TV function

Connect RF-TV terminal to the central signal source, enter the setup menu→ auto search, check if there is station skipping, the output of earphone and speaker, the picture are normal.

4.2 AV/S-VIDEO terminal

Input AV/S signal, check if the picture and sound are normal.

4.3 YPbPr/YCbCr terminal

Input YUV signal (VG-849 signal generator), separate input YUV format signal of table 1 and check if the picture and sound are normal.

Table 1 YUV signal format

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

1 15.734 59.94 SDTV 480i

2 31.469 59.94 HDTV 480p

3 44.955 59.94 HDTV 720p

4 33.716 59.94 HDTV 1080i

4.4 VGA terminal

Input VGA signal (VG-849 signal generator), separate input VGA format signal of table 2 and check if the picture and sound are normal. If the image is deflection of the H-field, select manual correction of Advanced Video Menu.

4.5 HDMI terminal

HDMI signal format receives the three high-definition signals: 480I, 480P, 720P/60Hz, 1080I/60Hz, except for the table 2 signal. Check if the image (contain HDCP ON and OFF) and sound are normal.

Table 2 VGA signal format

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

1 720 X 400 31.469 70.086 28.322 IBM

2 640 X 480 31.469 59.94 25.175 IBM

3 640 X 480 37.861 72.809 31.5 VESA

4 640 X 480 37.5 75 31.5 VESA

5 640 X 480 43.269 85.008 36 VESA

6 800 X 600 35.156 56.25 36 VESA

7 800 X 600 37.879 60.317 40 VESA

8 800 X 600 48.077 72.188 50 VESA

9 800 X 600 46.875 75 49.5 VESA

10 800 X 600 53.674 85.061 56.25 VESA

11 1024 X 768 48.363 60.004 65 VESA

12 1024 X 768 56.476 70.069 75 VESA

13 1024 X 768 60.023 75.029 78.75 VESA

Point clock pulse

frenquency(MHz)

Remark

5 Ex-factory setting of user menu

1) Select TV channel, volume: 25

2) Video menu, Picture Mode: Nature, Aspect Ratio: Wide

3) Video menu, Advanced Video Menu: Noise Reduction——Spatial: On Noise Reduction——Speckle: Off Noise Reduction——Temporal: On Sharpness: 0

Tine: 50 Color Temperature: Cool Skin Tome: White Auto Contrast Enhancement: Off Black Bar Detection: Off 3D Y/C: On

4) Audio menu, Sound Mode: News, Balance: 31, Earphone Vo1:31

Digital Audio Output: AC-3, MTS: Mono

5) Setup menu, Tuning Band: Air

6) Feature menu, Sleep Timer: Off, Menu Language: English Note: Except for Color Temperature of Cool, the Advanced Video Menu of YPBPR/YCBCR and VGA channels sets according to the adjustment of factory.

Trouble shooting

Before servicing please check to find the possible causes of the troubles according to the table below.

1.Antenna(signal):

Picture is out of focus or jumping z Bad status in signal receiving

z Poor signal z Check if there are failures with the electrical connector or

the antenna.

z Check if the antenna is properly connected.

Fringe in picture z Check if the antenna is correctly oriented.

z Maybe there is electric wave reflected from hilltop or

building.

Picture is interfered by stripe shaped bright spots

There appear streaks or light color on the screen

2.TV set:

Symptoms Possible cause

Unable to switch the power on z Check to see if the power plug has been inserted

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

Deterioration of color phase or color tone

z Possibly due to interference from automobile, train, high

voltage transmission line, neon lamp etc.

z Maybe there is interference between antenna and power

supply line. Please try to separate them in a longer distance.

z Maybe the shielded-layer of signal wire is not connected

properly to the connector.

z Check if interfered by other equipment and if interfered

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

properly into the socket.

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

z See if it’s receiving the signal that is transmitted from

other source than the station

z Check if it’s connected to the wrong terminal or if the

input mode is correct.

z Check if the signal cable connection between video

frequency source and the liquid crystal TV set is correct.

z Check if all the picture setups have been corrected.

Symptoms Possible cause

Screen position or size is not

proper

Picture is twisted and deformed z Check to see if the picture-frame ratio is properly set up.

Picture color changed or colorless z Check the “Component” or “RGB” settings of the liquid

Picture too bright and there is distortion in the brightest area

Picture is whitish or too bright in the darkest area of the picture

No picture or signal produced from the displayer if “XXX in search” appears.

There appears an indication “outside the receivable scope)

Remote control cannot work properly

No picture and sound, but only

hash.

Blur picture z Check if the antenna cable is correctly connected.

No sound z Check if the “mute” audio frequency setting is selected.

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

z Check is the screen position and size is correctly set up.

crystal TV set and make proper adjustment according to the signal types.

z Check if the contrast setting is too high. z Possibly the output quality of DVD broadcaster is set too

high.

z It maybe also due to improper terminal connection of the

video frequency signal in a certain position of the system.

z Check if the setting for the brightness is too high z Possibly the brightness grade of DVD player

(broadcaster) is set too high.

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

input mode is correct.

z Check if the TV set can receive input signal. The signal is

not correctly identified and VGA format is beyond the specified scope.

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

and the TV set.

z Check if the remote control signal- receiving window is

exposed to strong fluorescence.

z Check if the antenna cable is correctly connected, or if it

has received the video signal correctly.

z Of if it has received the right video signal.

z Check if the sound volume is set to minimum. z Make sure the earphone is not connected. z Check if the cable connection is loose.

z 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 TV, In 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

1. Connect RS-232 cable to computer and TV set. The cable must be a female to female RS-232

cable, and the line is TXD to RXD and RXD to TXD cross-link. It’s popular for PC to PC

connection.

2. If the computer has no RS-232 serial port(e.g. Notebook PC),you needs a additional USB to serial

port cable.

3. Copy the update tools (iDev.exe) to the path you want to do it, and double click it.

4. Select “setup” menu.

5. Confirm the Serial port is right. Base on the port which using for update. And set the band rate to

115200 (default).

6. Select the “Image path” menu.

7. Confirm it’s the right file.

8. If it’s not right(Maybe you didn’t select it before),click the “…”button to select “*.ecc” file. Sometimes

the image file you got it will be “*.rar ”or “*.zip” zip file, needs unzip it first.

9. You also can click the setup button to select and config, but please don’t select the red

one(update boot sector).

10. Then click the “down” button.

11. You can see the “waiting” window.

12. Then power (off then) on the TV set.

13. After download, it will be burning.

14. Last it will be finished

15. Press the (IR/ locate keypad) power key and holding for several second to force power off TV set,

then power on again. It would be ok now. If it’s failure you can try once again.

Working principle analysis of the unit

1. NTSC signal flow: Antenna reception NTSC signal send to the integrative tuner FQD1236, which contains HF and IF amplifier circuit and video decoding circuit. It is controlled by main IC ZR39660 (inside CPU) through I2C bus. The NTSC signal via frequency tuning, HF amplification, IF amplification, system switching and decoding, output video signal TV-CVBS of 1Vpp and sound IF signal (SIF). TV-CVBS and AV1-CVBS, AV2-CVBS input from AV terminal, via switch IC HEF4052 to output signal, one way send to ZR39660 for VEDIO DECODER, DEINTERLACE and SCALER, then send to LVDS level drive for LCD screen, another way is output through AV output socket as AV OUT. The sound IF (SIF) is fed into demodulation IC CAS220, via decoding and A/D conversion, it is fed into ZR39660 for analog control in the format of I2S. ZR39660 outputs audio data of I2S format, it is fed into audio D/A converter IC CS4344, output analog L/R signal. The L/R signal and sound signal of PC/YPRPB via diverter switch HEF4052BT, send to R2S15900SP (sound processing and volume control). Select right/left sound channel, their send to digital sound amplifier TPA3001 amplify, then send to speaker.

2. ATSC signal flow: Antenna reception ATSC signal send to tuner FQD1236, after frequency tuning, HF amplification, IF amplification and SAW FILTER, output IF signal to demodulation chip CAS220, via VSB or QAM demodulation, Sound stereo decoder, fed to ZR39660 for information source decoding in the format of standard serial TS stream. HD video signal via decoding to A/D conversion and OSD superposition, at last send to LVDS drive level for PDP panel. HD audio signal, via decoder built-in ZR39660, resumed to multi- channel sound of Dolby AC-3, at the same time output data stream of I2S format and S/PDIF data stream. Audio data of I2S format is fed to audio D/A conversion chip CS4344 to output analog L/R signal. S/PDIF data stream directly output from optical fiber interface.

3. PC/YPrPb signal flow PC and two YPBPR signal via matched resistance, it a-c couple to video switch SN74CBT3257CDR, via switching to selected signal to Triple Video A/D Converter MST9883 A/D conversion. Send B/G/B of 24 bit to main IC ZR39660 digital decode, image scale and OSD superposition, then send to LVDS level drive for LCD screen. Sound signal (PC, YPrPb) via switch diverter HEF4052BT to output signal, it send to R2S15900SP (sound processing and volume control) switch of audio. Select right/left sound channel, their send to digital sound amplifier TPA3001 amplify, then send to speaker.

4. HDMI signal flow HDMI video signal is directly fed to main IC ZR39660 (with HDCP function of HDMI) digital decode, image scale and OSD superposition, then output LVDS drive level for screen. HDMI audio signal, via decoder built-in ZR39660,output data stream of I2S format and S/PDIF data stream at the same time. Audio data of I2S format is fed to audio D/A conversion chip CS4344 to output analog L/R signal. S/PDIF data stream directly output from optical fiber interface.

Block diagram

654321

DVI AUDIO

YPBPR1 AUDIO

YPBPR2 AUDIO

SN3253C

CVBS1

CVBS2

S_Y

S_C

YPBPR1

YPBPR2

FQD1236 MK5

SN3257C

TUNER

CVBS_TV

HEF4052BT

YPbPr

Digital IF Analog SIF

MST9883

CAS220CS

D/A CS4344

HDMI1 HDMI2

HS,VS,CLK

IIS IN

CVBS,Y/C IIS OUT

HDMI Switch

24-BIT Data

M29W320E

FLASH

ZR39660

BGA400

2X16MX16

DDRAM

LVDS

AV_OUT

Panel

AV1 AUDIO

AV2 AUDIO

R2S15102NP

R2S15900SP

NJW1109

1 2 3 4 5 6

Loudspeaker

Earphone

Title

Number RevisionSize

Date: 6-Feb-2007 Sheet of File: Drawn By:

V1.0

IC block diagram

1. ZR39140

Pin descriptions of ZR39660: (1) Serial Transport Input Port T4: MPEG Transport Port Input Clock T3: MPEG Transport Input Data U3: MPEG Transport Input Frame Y1: MPEG Transport Input Valid

(2) HDMI Input D1,E3,F3,E2,F2,E1: HDMI Differential Data Pairs D2,C1: HDMI Differential Clock Pair C3: HDMI Serial Clock B2: HDMI Serial Data A1: HDMI Hot Plug Detect D3: HDMI Current Set

(3) NTSC/PAL Analog Input Port W2:Video Front End Luminance In Y3:Video Front End Chroma In W3:Video Front End Common Mode Reference

(4) Analog Video Output K18:Composite Data Output (CVBS) J20:Blue/Pb Pixel Data Output J18:Green/Y Pixel Data Output J19:Red/Pr Pixel Data Output

(5) Audio I/O R2:Audio Clock R3:Bit Clock P3:Left/Right Channel Selector U2:Serial Audio Data Input T2:Serial Audio Data Output V1:IEC958 Format Out

(6) LVDS Panel Interface B20,C19: Output Clock Pair E18,F17: Output Data Pairs 0 C20,D19: Output Data Pairs 1 F18,G17: Output Data Pairs 2 D20,E19: Output Data Pairs 3 E20,F19: Output Data Pairs 4 H18,G18: Output Data Pairs 5 F20,G19: Output Data Pairs 6 G20,H19: Output Data Pairs 7 D18 : External Resistor Connection

(7) UART and I2C Interface N1: UART 0 Transmit P1: UART 0 Receive R1:I2C Compatible Clock 0 P2:I2C Compatible Data 0 M3:I2C Compatible Clock 1 M2:I2C Compatible Data 1

(8) Miscellaneous M4, N3: Two pins required to support the 24.576 MHz crystal N5: Power On Reset L4: Infrared Receive

2. CAS220/CS

The CAS-220/CSO is a multi-standard demodulator and decoder for terrestrial and digital cable TV reception. It is designed to support 8-VSB (Vestigial Side Band) in full compliance with ATSC Digital Television Standards, ITU-T J.83 Annex B, and OpenCable™ Out-of-Band Signaling. The CAS-220/CSO also demodulates analog BTSC and Korea A2 sound. Its basic function is to recover the digital data encoded into the broadcast signal, which includes video and sound program information and ancillary data service.

Pin configuration of CAS220/CS:

Pin descriptions of CAS220/CS: 61: RESET_N 79, 80 oscillator 13 Select I2C address 16: I2C data for host communication with the tuner 18: I2C clock to the tuner 19: I2C clock from host 20: I2C data from/to host 93,94: Differential input for IF 96,97: Differential input for SIF 63: Digital Sound Word select (L/R select) 65: Digital Sound Serial data output 66: Digital Sound Serial clock. 17,30,46,62,74,82,84: Power Supply 3.3V 5,9,22,37,53,69,75,78,86,87,99: Power Supply 1.8V 6,7,15,23,33,35,45,55,60,70,73,76,77,81,83,85,88,91,92,95,98: Ground

3. MST9883

MST9883 is a Triple Video A/D Converter with Clamps & Pixel Clock Synthesizer. The triple ADC support 12 - 110 MHz Sampling Rate. It integrated 5-bit pixel clock phase adjustment for precise sample timing control. It’s Output support 4:2:2 Format Mode and it can Pin Compatible with AD9883A. Block diagram of MST9883 is flow:

Pin configuration of MST9883:

Pin descriptions of MST9883: 54: Red analog input 48: Green analog input 43: Blue analog input 49: Sync on Green analog input 38: External Clamp Input 30: Horizontal SYNC Input 31: Vertical SYNC Input 29: Hold PLL Frequency, do not track HSYNC 56: Serial Interface clock 57: Serial Interface data pin 55: Serial interface address pin 70-77: Red output data 2-9: Green output data 12-19: Blue output data 67: Output data clock 66: HSYNC output 64: VSYNC output 39,42,45,46,51,52,59,62: Analog Power

26,27,34,35: PLL Power 11,22, 23, 69,78,79: Digital Output Power 1,10,20,21,24,25,28,32,36,40,41,44,47,50,53,60,61,63,68,80:Ground

4. R2S15900SP

R2S15900SP is an audio signal processor. It has MUTE and Volume/Tone control. It can support 5 input selector.

Pin descriptions of R2S15900SP: 2,27: AV1 AUDIO INPUT L/R 3,26: AV2 AUDIO INPUT L/R 4,25: DTV AUDIO INPUT L/R 5,24: EAR PHONE L/R 6,23: AV OUT L/R 11,19: AUDIO OUTPUT L/R 17,18:I2C SDA/SCL 28: Power Supply 12: Ground

5. R2S15102NP 10Wx2ch(SE)/20Wx1ch(BTL) Digital Audio Power Amplifier

R2S15102NP is a Digital Power Amplifier IC developed for TV R2S15102NP can realize maximum Power 10Wx2ch (VD=24V, THD=10%, SE) at 8Ω load. It is possible to replace from the conventional analog amplifier system to the digital amplifier system easily.

Pin Configuration

No. NAME I/O Description

1 OUT1 O Power Output pin #1

2 VD1 - Power supply pin for power output stage #2

3 STBYL I Stand-by control pin. When this is “L”, circuit current is reduced.

There is the pull-down resistor: 50K ohm(typ.).

4 PWM1 I PWM input pin #1 (for phase compensation)

5 IN1 I Analog input #1.The gain is depended on the external resistance.

6 CBIAS I/O A capacitor is connected so that it may not be influenced of power

supply change (Ripple Filter).

7 ROSC I Control pin for PWM carrier frequency

8 GND - GND pin for analog block

9 VREF I/O Capacitor connection pin for analog block reference voltage

source

10 PROT O Protection Timer pin. At protection mode, the output

becomes ”L”-level.

(The timing capacitor is connected)

I SE operation Analog input #2(as same as IN1) 11 IN2

I BTL operation When this is connected to DVDD pin via the

resister, Reversed signal of OUT1 is output to

OUT2.

12 PWM2 I PWM input pin #2 (for phase compensation)

13 MUTEL I Mute control pin. When this is “L”, it becomes mute status.

14 VD2 - Power supply pin for power output stage #2

15 OUT2 O Power Output pin #2

16 VS2 - Ground pin for power output stage #2

17 HB2 I/O Capacitor connection pin for bootstrap

18 DVDD O Built-in power supply pin for internal digital block.

19 HB1 I/O Capacitor connection pin for bootstrap #1

20 VS1 - Ground pin for power output stage #!

Wiring diagram:

To speaker

Pin 1,2 r ig ht a ud io c ha nn el

borad interface

Bac kl ig ht

CN2

X102

667- 27 FB1 8- 53

667- L2 7W1 8- 09

IR board

XA0 1

Analog board

X10 3 X 22 2

X22 1 X10 1

X10 4

4 pins

XC0 2

XB01 XB03

XC0 1

X80 1

X80 5 X60 2 X

Digtal board

667- 27 FB1 8- 69

XB0 1

3 pins

But to n bo ard 667-3 2F B1 8- 0 5

X 0

112

4 pins

2pins

802

LVDS 3 0 pi ns

8 pins

8- 4 0

3 pins

Power board

X50 2

X50 3

667- L2 7U2 5- 20

3 pins

7 pins

Pin 3,4 l ef t au di o ch an ne l

6 F 1

boaVid

- 32 B

Pow er switch

To speaker

Troubleshooting guide

Yes, turn the unit on

If the picture of each channel

is normal?

If the sound of each channel is

normal?

(1) abnormal picture

a) Failure with resistor rows R839~R844 of image processing board, which may lead to lack of

b) Failure with resistor rows R825~R830 of image processing board, which may lead to lack of

c) A certain differential wire pair of LVDS of XA50 or X803(RX0+/-, RX1+/-, RX2+/-, RX3+/-)is

d) Failure with resistor rows RA18~RA25, which may lead to loss of corresponding color from

e) Failure with NB07,NA51 and their peripheral circuit, which may lead to picture abnormal of

f) Failure with N104, which may lead to picture abnormal of TV, AV1, AV2, S-VIDEO.

g) Failure with N803/N805/N806, which may lead to picture abnormal in all channels.

Begin

A red indicator

lights?

A blue indicator

lights?

Ye s

Display picture?

Ye s

color or color splash.

abnormal, which may lead to lack of color or color splash.

the gray degree corresponding to the picture of channel HDMI.

PC, YPrPb and YCrCb.

Check power board , button board and power

cord

Check if the pin1 of X602 in data processing

board is high level(+5V)? check V660/V661.

Check if the crystal in data processing board

starts, DDR clock is correct?

Check the signal inputted from the channel to

pin IC or IC and its peripheral circuit or the

output of LVDS is normal

Check the signal inputted from the channel to

pin IC is normal or IC(R2S15900/TPA3001)

and its periphery is normal

(2) no picture, no sound

No picture, no sound

Red

Check the color of indicator

Check the power

oard

No sound No picture

Refer to (3) checking

rocedure

(3) with picture but no sound

With picture but no sound

Check if the voltage of sound amplifier

of X106 in analog board is normal?

Check if the pin5, pin11 of

N111 inputs signals

Ye s

Check N111 and their

eripheral circuit

Ye s

Refer to (4) checking

rocedure

Ye s

Blue

Check the output voltage of

sockets X601~X604

Power board problem

Check the power board

Check N103/NB05 and

their peripheral circuit

X606/X608

(4) with sound but no picture

Yes N o

If there is no picture

in all channels?

Ye s

Check N108 and

its peripheral

circuit

With sound but no picture

Display OSD MENU?

Ye s

Display LOGO? If pin5 of X602 (IRR) has signal?

Check if the crystal in data processing board starts,

DDR clock and DDR SDRAM are normal?

Refer to (6), (7), (8), (9), (10),

(11), (12) checking procedure

Refer to (5) checking

procedure

Yes N o

Check N801, N802, DDR

and their peripheral circuit

and power supply

(5) Check image processing board

Check the power supply

of N803

Ye s

Check if pin20, 21, 27,

30 of X801is high level

Check if the power supply of

L801/L802 are normal

Ye s

Check if pin3, 5, 26 of N806

output H/V-SYNC and clock

Check the peripheral and power supply of

N801, N802, DDR of data board

Ye s No

Check the peripheral and power

supply of N806

Check if pin34, 65, 66 of N803 output

H/V-SYNC and clock

Ye s No

Check the peripheral and

power supply of N803

Check the peripheral and

power supply of N805

Note: please make sure that the data of FLASH N804 is correct before checking the image

processing board.

(6) AV no picture

Check if pin13 of N104

outputs signals?

Ye s

Check the periphery circuit

from XC02 to N801

(7) S-terminal no picture

Check if pin13/3 of N104

outputs signals?

Ye s

Check the periphery circuit

from XC02 to N801

Check if C136 and C137

input signals?

Ye s

Check if C105 and C138

input signals?

Ye s

Check N105/N106 and the circuit

from AV terminal to N104

Check N104 and its

periphery circuit

Check N108 and the circuit

from S-terminal to N104

Check N104 and its

periphery circuit

(8) NTSC channel no picture

Check if pin11 of TUNER226

output signals?

Ye s

Check if pin13 of N104

outputs signals?

Check TUNER226 power supply

and the peripheral circuit.

Ye s

Check the periphery circuit

from XC02 to N801

Check N104 and its

periphery circuit

(9) ATSC channel no picture

Check if pin6/7 of TUNER226

output signals?

Ye s

Check if the crystal of

N228 (20MHz) is normal?

Check TUNER226 power supply

and the peripheral circuit.

Ye s

Check the clock signal of

each pin of XC01

Check G226, N228 and

periphery circuit

Note :

The I2C bus line control of TUNER is switch through the bus line of N228, so after checking the power

supply and peripheral circuit of TUNER226, it is still no picture in NTSC and ATSC channel, please

check N228 emphatically.

(10) YprPb or Ycrcb channel no picture

Check if pin4/7/9 of NB07

output signals?

Ye s

Check if pin64/66/67 of

NA51 are normal?

Yes N o Yes N o

Check resistor

rows RA63~

RA68

Check NA51

and peripheral

circuit.

(11) D-sub channel no picture

Check if pin4/7/9 of NB07

output signals?

Ye s

Check if pin64/66/67 of

NA51 are normal?

Yes N o

Check resistor

rows RA63~

RA68

Check NA51

and peripheral

circuit.

Check if pin4/7/9 of NB08 output

signals?

Check NB01/NB02

and the circuit from

X807/X808 to N808

Check NB03/NB04

and the circuit from

X807/X808 to N808

Check NB07

and peripheral

circuit.

(12) HDMI channel no picture

Check DETECT NA04 and its

peripheral circuit?

Ye s

Check if signals of

RA18~RA25 are normal?

Ye s

Check N801 and its

eripheral circuit

Check the connection to HDMI

socket, NA04 and its peripheral

circuit

Note: N801 embeds FLASH, which stores DDC and HDCP information of HDMI, so make sure the connection between HDMI socket/interface and the bus line is well- going, the picture will display.

(13) Troubleshooting guide of power supply board (23” and 27”)

a. No power supply

No power supply

Does AC voltage at C505

Check if X501 FU501 is

properly inserted?

Does DC voltage at C528

(150~370V)

Check D502, R531, D508

Check if the 15V DC of

N501 (pin13)

Check N501 or peripheral