LG PDP42V5 Series, Service Manual

Page 1: ...MANUAL CAUTION 1 BEFORE SERVICING THE PDP MODULE READ THE SAFETY PRECAUTIONS IN THIS MANUAL 2 WHEN REPLACEMENT PARTS ARE REQUIRED BE SURE TO USE REPLACEMENT PARTS SPECIFIED BY THE MANUFACTURER MODEL PDP42V5 Korean English ...

Page 2: ... is loose do not use the product otherwise this can lead to fire or electric shock 9 If the power connector or the connector of the power cable becomes dirty or dusty wipe it with a dry cloth Otherwise this can lead to fire 10 PDP Module uses a high voltage Max 450V dc Keep the cautions concerning electric shock and do not touch the Device circuitry when handling the PDP Unit And because the capac...

Page 3: ...emperature The absolute maximum ratings specify the limits of these stresses 20 The recommended operating conditions are conditions in which the normal operation of this product is guaranteed All the rated values of the electrical specifications are guaranteed within these conditions Always use the product within the range of the recommended operating conditions Otherwise the reliability of the pr...

Page 4: ... is generated at regular internal on the whole screen 2 7 Data copy is generated to stripe direction 2 8 One or more stripe is generated on the screen 2 9 One or more horizontal line is generated on screen 2 10 Lightness of screen is wholly darken though there is input signal pattern 2 11 Different color is shown partially during full white screen or electric discharge is generated during full bla...

Page 5: ...A 6871QZH030A PWB PCB ASSY PWB PCB ASSY PWB PCB ASSY PWB PCB ASSY PWB PCB ASSY PWB PCB ASSY PWB PCB ASSY Description TMDS CTRL B D ASSY LVDS CTRL B D ASSY Y DRV UPPER B D ASSY Y DRV LOWER B D ASSY X RIGHT B D ASSY Y SUS B D ASSY Z SUS B D ASSY NO 1 2 3 4 Connector P1 Z SUS B D P5 Y SUS B D P6 Y SUS B D P21 P31 CTRL B D Input Signal 5V Va Vs 5V Vs 5V Video Signal ...

Page 6: ...the voltage wave form of Vset down 3 Adjusting the voltage wave form of Vramp 3 2 Adjustment after assembling PDP Module adjustment 1 Setting up the initial voltage and adjusting the voltage wave form of Vsetup 2 Measuring the voltage Margin of Vs and deciding the voltage 3 Adjusting and checking the voltage of DC DC pack Vsetup Vscw Ve Vy 4 Adjusting the voltage wave form of Vset down 5 Measuring...

Page 7: ...right leg of the Y B D and set the Plus terminal to the left leg of R60 to check the Vscw voltage 115 1V and when there is abnormality in voltage turn the variable resistor VR5 of DC DC Pack Vscw on Y B D to adjust ΠConnect the GND terminal of DVM to the R8 s right leg of the Y B D and set the Plus terminal to the left leg of R8 to check the Vy voltage 80 1V and when there is abnormality in volta...

Page 8: ...nge 180V Vs 195V in consideration of other features Turn the voltage adjusting knob of Vs DC power supply make deciding the Vs voltage ı Adjust Vset down wave form using setting up Vs voltage like mentioned on the 4 3 4 Adjusting the final voltage wave form Check the voltage wave form like the mentioned way on the 4 3 How to adjust and readjust the wave form when it is twisted 5 DC DC Pack Voltage...

Page 9: ...ower Supply for Va DC Power Supply for Vs Caution 1 The power of the signal generator should be turned on before turning on the power of DC power supply 2 The voltage of DC power supply in standard of Module input voltage should be preset as below Vcc 5V Va 65V Vs 190V 3 The power of power supply must turned on by this sequence Reverse direction When turning off Module on 5V Va Vs Module off Vs Va...

Page 10: ...X B D Y B D and Z B D to CTRL B D 5 Measure the output wave of X Y Z B D with oscilloscope more than 200MHz and find the trouble of B D by comparing the output wave with below figure Measure Point fo Y B D TP Connector P4 80 pin Measure Point fo Z B D Connection part of panel SUS_OUT Measure Point fo X B D L1 RIGHT L2 LEFT BOTTOM 6 Check the SCAN Y side IC 7 Check the DATA X side COF IC 8 Replace ...

Page 11: ... 11 A Y B D Output wave 1Frame B Y B D Output wave 7 12 SF A Z B D Output wave 1Frame B Z B D Output wave 1SF X B D Output wave 1 FRAME X B D Output wave 1 SF X B D Output wave Enlargement ...

Page 12: ... COF Include not be shown part of Data COF quantity or a part 1 The problem between Data COF and X B D is more possible that the screen is not be shown as data COF 2 Confirm the connector of Data COF is well connected to X B D Correspond to the part that screen is not showing 3 Confirm whether the Data COF is failed and replace X B D Example of the screen display form Anything of the 7 Data COF ca...

Page 13: ... the quantity of two Data COF IC that means the data which is conveyed from CTRL B D doesn t conveyed well 2 Confirm the XB D connection connector plugged in well Correspond to unusual screen 3 Replace relevant XB D or CTRL B D Relationship between screen and X B D Screen X B D Left Bottom of the Screen 4 7 Right X B D Right Bottom of the Screen 3 7 Left X B D Screen Display Form 13 Case 1 Case 2 ...

Page 14: ... The screen has a vertical line with regular gap A vertical stripe flash at especial color 1 This is a problem about control B D 2 Replace Control B D Screen Display Form 2 7 A data copy is happened into vertical direction 1 In this case it s due to incorrect marking of scan wave 2 Replace a Y DRV B D or Y SUS B D Screen Display Form 14 one eighth of screen The screen display is very good The scre...

Page 15: ...ially on full white screen or happens discharge partially on full black screen 1 Check the declination of Y B D set up set down wave 2 Check the declination of Z B D ramp wave 3 Measure each output wave with oscilloscope more than 200MHz and compare the data with below figure data Adjust the Y B D set up Test up B C s s setdown Test down D s and Z B D ramp Tramp F G s s declination by changing VR1...

Page 16: ... 16 Block Diagram ...

Page 17: ... 04 21 Part Number 6871QCH025A 6871QCH029A 6871QDH051A 6871QDH052A 6871QYH027A 6871QZH030A 6871QRH034A Note Initial Product Initial Product Initial Product Initial Product Initial Product Initial Product Initial Product Board CTRL B D ASSY TMDS CTRL B D ASSY LVDS YDRV Upper B D ASSY YDRV Lower B D ASSY Y SUS B D ASSY Z SUS B D ASSY X RIGHT B D ASSY ...

Page 18: ... 18 2 ROM DATA No 1 2 Date 2003 04 21 2003 04 21 Contents Initial ROM Data of TMDS Initial ROM Data of LVDS ROM Data Version 42V5_06 42V5_08 ...

Page 19: ...June 2003 Printed in Korea 3828VD0143E ...