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Prima PS-42T8, Руководство по обслуживанию

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17 

Pin Function 

Pin  Function 

2, 27  Left and right track of M52797 

5, 24 

Left and right track of YPbPr1 

3, 26  Left and right track of HDMI 

11, 19

Left and right track of audio output 

4, 25  Left and right track of VGA 

 

 

 
3.6 LA72700 (STEREO/SAP DECODER): 

 

PIN description: 

Pin No. 

Name 

Description 

Pin No. 

Name 

Description 

5 

PISIF 

Audio IF input 

25 

R OUT 

Right channel audio output 

11 

SDA 

I2C bus 

26 

LOUT 

Left channel audio output 

12 SCL 

I2C 

clock  31 VCC 

9V 

 

Содержание PS-42T8

Страница 1: ...PDP TELEVISION PS 42T8 Brazil ...

Страница 2: ...tructions Method of software upgrading Block diagram Working principle analysis of the unit Diagnose and service of panel 20 Wiring diagram Assembly list Trouble shooting guide Schematic diagram APPENDIX Exploded view 1 3 6 7 8 18 23 24 25 30 ...

Страница 3: ...heat radiation parts or direct exposure to sunlight Otherwise there will be kickbacks 1 5 In case foreign substances such as water liquid metal slices or others fall into the module carelessly power must be cut off immediately Keep the module as it is and do not move anything on the module Otherwise it might be possible to contact the high voltage or cause shock short circuit so that it may lead t...

Страница 4: ... former On the other hand even if changes take place in the picture it can keep its brightness for a period of time several minutes It s a feature inherent with plasma and it s not abnormal However please try as much as possible to avoid showing a still picture of high brightness for a long time during operation 1 16 As a digitalized display devise this module is provided with error diffusion tech...

Страница 5: ...re the test point TP1 12VAMP on the HF board to be 14 V 0 05 V 3 2 Digital board adjustment 3 2 1 Connect digital board button board and HF board turn on the unit check if display normal Check MEGA8 DDC and FLASH To produce digital board and HF board Check the digital board and HF board All testing Connect with central signal source then check each function of TV such as analog control etc check t...

Страница 6: ...n_G let the color coordinate of seventh level be 270 and 283 Adjust offset_G and offset_B and gain_R and gain_G repeatedly until the value of the two levels gray scale to 270 and 283 Note after white balance adjustment adjust 3 2 3 2 item ADC auto correction again 3 2 4 AV TV channel adjustment 3 2 4 1 sub brightness and sub contrast adjustment Input the AV color bar signal PM5518 COLOUR BAR 100 t...

Страница 7: ...ordinate of the third level be 285 and 290 and its brightness be 4 5 5nit Fixed gain_B to 128 Adjust gain_R and gain_G let the color coordinate of seventh level be 285 and 290 Adjust offset_G and offset_B and gain_R and gain_G repeatedly until the value of the two levels gray scale to 285 and 290 Select 12000k of mode fixed offset_R to 128 adjust offset_G and offset_B let the color coordinate of t...

Страница 8: ...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 Switch on TV set the FLASH write program begins to run After FL...

Страница 9: ...audio TV VIDEO AV1 Audio TDA3001 x 2 class D NJW1109 Speaker Earphone SDRAM PW118 MCU and scaler AD9398 HDMI Flash MX29LV800 DDR SDRAM 128M EM6A9320 PDP SCREEN 24bit RGB 24bit RGB AV2 Audio HD2 Audio S Video YPbPr1 YcbCr1 YPbPr2 YcbCr2 PC HDMI Video Audio I2 C I2 C I2 C I2 C I2 C PC audio HD1 audio LVDS I2 C or SIF ATMEGA8L power control I2 C ...

Страница 10: ... incautious shorting it will get right as long as you restart it 2 The picture part The video signal outputted by the tuner send to AV switch M52797 N903 input the video signal of AV1 and AV2 to M52797 N903 and switch to gain two group of video output One group output of video signal sends to the AV OUT terminal with its sound output and treat them as the AV OUT output Another group output of vide...

Страница 11: ...e inputted to this chip to the AD switch and video decoding 24 bit digital RGB signal and the related sync signal are outputted to N602 PW118 to make the processing PW2300 complete mainly the functions of 3D comb filter the channel switch 5 line Y C separation the color decoding and so on It connect external SDRAM chip N703 HY57V161610E treated as the internal memory to assist the operation of PW2...

Страница 12: ...E14 GBE 0 7 Blue data output 3 2 AD9398 The chip of high definition multimedia interface AD9398 HDMI High D efinition Multimedia Interface this interface is the digital interface standard that bring up rapidly The use of this interface is the transmission of electronic video signal of standard definition and high definition and this interface provide the content protect technology AD9398 also supp...

Страница 13: ...ata I O 20 21 MCLK Control clock output 51 MCL HDCP control series data clock 22 I2S_SCK Audio series clock output 52 MDA HDCP control series data I O 23 I2S_WS Bus clock data output 82 SCL 1 Series data clock 27 I2S_SD Bus audio data output 83 SDA_1 Series data I O 34 RX0 DVI digital video input 84 G_FIEL0 Parity field output 35 RX0 DVI digital video input 85 G_VS Vertical data sync output 37 RX1...

Страница 14: ...ll control except for the power supply control including the control of each chip operation in the main board eg the image manipulation the channel switch the image display etc the control of the button remote device and sound etc and the assistant CPU N401 ATMEGA8L control mainly the power supply including the stand by and the control button of remote device to turn on the set etc The menu interf...

Страница 15: ...13 The arrangement diagram of the pins 3 4 M52797 M52797 is a AV switch chip controlled by IIC This chip include 4 group of video input and 4 group of audio input 2 video output and 1 audio output ...

Страница 16: ...14 M52797 Internal block diagram The arrangement diagram of the pins ...

Страница 17: ...3 Video output to AVOUT interface 7 AV1 audio input 24 Left track audio output 8 AV1_R audio input 25 TV_R audio input 9 AV2_L audio input 26 TV video input 10 AV2 audio input 27 TV_L audio input 11 AV2_R audio input 3 5 R2S15900 R2S15900 is a audio processing chip that take charge of audio switch sound processing and volume adjustment controlled by IIC bus Internal block diagram ...

Страница 18: ...16 R2S15900 instruction of the pin ...

Страница 19: ...t track of HDMI 11 19 Left and right track of audio output 4 25 Left and right track of VGA 3 6 LA72700 STEREO SAP DECODER PIN description Pin No Name Description Pin No Name Description 5 PISIF Audio IF input 25 R OUT Right channel audio output 11 SDA I2C bus 26 LOUT Left channel audio output 12 SCL I2C clock 31 VCC 9V ...

Страница 20: ...amplifier is controlled by two input terminals GAIN1 and GAIN0 This allows the amplifier to be configured for a gain of 12 18 23 6 and 36 dB The differential input stage provides high common mode rejection and improved power supply rejection The amplifier also includes depop circuitry to reduce the amount of pop at power up and when cycling SHUTDOWN The TPA3001D1 is available in the 24 pin thermal...

Страница 21: ...19 Pins of TDA3001 ...

Страница 22: ...e driving signal for X and Y driving boards Logic BUFFER board To convert the data signal and control signal sent from the logic board into the signals required by COF Y BUFFER board to transmit the scanning signal from the Y driving board to the screen which is divided into upper and lower parts COF to convert the signal sent from the logic BUFFER board into the address signal used by the screen ...

Страница 23: ...roblem lies in our main board or video frequency processing board which will be dealt with separately d If the screen is not lit then first replace the power supply board to see if the problem is solved e If the problem remains after the power supply board is replaced then the problem lies in the screen replace the entire screen for treatment 2 2 There appears on the screen a line or several unlit...

Страница 24: ... problem still remains when the replacement is over then replace the logic board 5 There appears on the screen a mono color signal and one or several vertical bright lines of other colors a If it s a vertical bright line of other colors then the problem lies with COF or the screen b If it s an entire vertical block of other colors then first check to see if the connection socket between COF and lo...

Страница 25: ...ard X600 X400 X405 RS 232 HDMI VGA YPbPr YCbCr1 YPbPr YCbCr2 Power supply filter board Speaker assembly button board Logic board LA03 Power supply board CN9004 CN9003 CN8001 X301 X300 X302 X904 X903 X906 AV out S Video in AV1 in AV2 in earphone HF board X909 X908 RF ...

Страница 26: ...42T8 02 Power filter board 535 RCP03 00W Remote control 615 10412 03S Stand assy 615 20543 00S Speaker assy 667 PSIT8 69 Data processing board 667 PS42D8 20 Power board 667 PS42T6 05 Button board 667 PS42T8 55D High frequency board 335 42015 00 Panel PDP42V70413 ...

Страница 27: ... light is on Check 5V STBY Cut off the connection between power supply board and data board and test 5V STBY Check N401 and keyboard The problem of power supplies board Check power supply D3 3V D5V Measure the level of 8th pin of X405 when use V4 screen it should be low level when use V7 screen it should be high level Check the level of power supply pin of each IC Check if the union joint of N602 ...

Страница 28: ...d but no picture Display logo Check if all other channel has no picture N602 PW118 and periphery circuit Turn to check 4 of program Check if the G401 and G7000 have the signal wave Unfix X405 and X406 short circuit the PIN8 of X405 to GND set switch of the logic board as self testing signal then check if display the white screen Check the input signal of N602 and power supply The screen damaged N6...

Страница 29: ...08 is output The sound damaged Check if the second pin of sound power amplifier input the signal Measure if the sound input of current channel of N907 is normal Check N907 or peripheral circuits Check different levels of circuit following input audio signal channel No Yes No Yes No Yes Measure if the AV input pin of N700 have the signal input Check if TV channel is normal Check N903 M52797 and per...

Страница 30: ...rface circuit Check if the YPRYPB input pin of N700 have signal Check N700 and periphery circuit Yes No No Yes Check if the input signal of N700 is normal Check if AV channel is normal N700 damaged Check if N700 has output Check N903 M52797 and the tuner Check N602 and periphery circuit Abnormal Normal Normal Abnormal No Yes ...

Страница 31: ...and definition TV set abnormal vertically on half screen of high definition TV set They may be caused by the damage of the address BUFFER module that directly corresponds to its position or may be caused by the damage of the connection wire that directly corresponds to the position of the screen The horizontal bar like abnormality is also related to the Y driving circuit that corresponds directly ...

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Страница 44: ...APPENDIX Exploded view ...

Страница 45: ... Speaker 16 Main board assy 4 Speaker back cover 17 Video board assy 5 Speaker fixed board 18 Trans connecting board assy 6 Panel frame assy 19 Back cover 7 Middle cabinet 20 Socket 8 LED column 21 Screw 9 Button board assy 22 Socket 10 Button 23 Back cover 11 Filter glass 24 Baffle 12 Hold down bar 25 Stand 13 Hold down board ...

Страница 46: ...603 PS42T80 29S Ver 1 0 ...

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