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4. Trouble shooting.

Mal-discharge

Most of mal-discharge appearance is problem of y drv ,y ,z b/d.check these boards when occurred.

Checking order

1. Confirm Y, Z SUS signal cable.

2. Check Y DRV IC FAIL

3. Check Y sus b/d voltages(-Vy.Vscw)

4. Check Y ,Z-SUS IPM fail

5. Replace CTRL b/d

*Mal-discharge

Содержание 42V5

Страница 1: ...ver 1 01 PDP Instruction Manual for customers Model 42V5 ...

Страница 2: ...CONTENTS INTRODUCTION PRECAUTIONS BASIC TROUBLE SHOOTING This manual is for the 42 V5 model Basic rules are same with 42 V5 for other models ...

Страница 3: ...ction 1 1PDP module PDP module is composed with PANEL part and DRIVE part Panel is consist of electrode phosphor dielectric gas And drive part is made up of electronic circuit X Y sus Z sus Y drv PSU CTRL B D and PCB ...

Страница 4: ...l articles of defect panel 2 Let customers can distinguish module defect LG Electronics defect and a defect from their work by educating an early analysis for SET maker So customers can decide easily whether it is LG defect or customer s 3 Prevent defects which is made during set assembly process previously by educating Work precautions and conditions 1 Introduction Since mixed terms may cause con...

Страница 5: ...5 39 42 inch V5 MODEL 1 Introduction Y DRV BTM X LEFT B D CONTROL B D X RIGHT B D IPM Z SUS B D Y SUS B D Y DRV TOP ...

Страница 6: ...of MODULE position Back side of module 1 Introduction Model Name Bar Code Code 128 Contains the manufacture No Manufacture No The trade name of LG Electronics Manufactured date Year Month The place Origin Model Suffix PDP Module S N When you request LG to repair PDP module Please inform LG the Module S N for tracking the module s history by e system Module SERIAL NO ...

Страница 7: ...39 Voltage label Attached on back side of module Part No label Attached on board COF serial No label attached on COF PCB PART NO BOARD ASS Y PART NO BOARD NAME COF SERIAL NO 1 Introduction BOARD SERIAL NO ...

Страница 8: ...8 39 Terms of defect 1 Introduction Add short light on Add open light off Sus short light on Sus open light off Add bar light off Mal discharge Cell defect Add short light on ...

Страница 9: ... module must be Moved by two man 7 Be careful with short circuit of PDP boards when measuring any voltages 2 Precaution 2 1 Safety precautions 3 Before requesting Service please inform us a detail defect phenomenon and history of module document it can be helpful to us for a smooth service Ex COF long 2 1 fail address 1 line open Y b d problem mis discharge 1 Check panel surface and appearance of ...

Страница 10: ... the most important component in the PDP module Even a little imperfection of COF can make a serious screen problem 2 3 Handle with care COF 2 Precaution These must not happen in These must not happen in assemby assemby process process BEING PUSHED ...

Страница 11: ...nd of funtion one is an addressinng and another is a path It receives LOGIC signal from CONTROL B D and make ADDRESS PULSE generates Address discharge by ON OFF operation of FET and supplies this waveform to COF data as a path Power part Power part Signal part Signal part 1 X B D ...

Страница 12: ...es SUSTAIN discharge in panel by receiving LOGIC signal from CONTROL B D this waveform is supplied to panel through FPC Z composed with IPM FET DIODE electrolytic capacitor E R coil 3 Basic 2 Z sustain B D IPM Intelligent Power Module E R Energy recovery ...

Страница 13: ...a wave form that select Horizontal electrode Y SUSTAIN electrode sequentially potential difference is 0V between GND and Vpp of DRIVER IC in SUSTAIN period being generated potential difference between GND and Vpp only in SCAN period In case of 42 X1 use DRIVER IC IC 12 EA TOP BOTTOM each 6EA 3 Basic Scan drive IC 3 Y drive B D ...

Страница 14: ...B D Composed with IPM DIODE electrolytic capacitor FET creates signal processing Contour noise reduction ISM and an order of many FET on off of each DRIVER B D with R G B each 8bit input Use 3 3V 5V 2 kinds of power 5 Control logic Board 4 Y sustain B D 3 Basic MCM Multi Chip Module ...

Страница 15: ... Y B D One is single sided another is double side These are having pattern on it for Z B D there is no pattern single sided and Beta type all of copper surface for connecting a Logic signal between B D and B D There is 0 5mm pitch 50pin type 1mm pitch 30pin type 6 FPC Flexible Printed Circuit 7 FFC Flat Flexible Cable 3 Basic ...

Страница 16: ...et IC on it in B D without using IC PACKAGE we use a BARE IC so we can get IC with LOW COST because we do not solder IC on PCB directly a soldering defect rate decrease composition 1 FPC Heat Sink FPC for COF must have a Low Spec decline with getting damp 2 CHIP resistor CHIP CAPACITOR 3 BARE IC STV7610A WAF GOLD WIRE AL WIRE 4 EPOXY MOLDING 8 COF Chip On Film Bare IC 42 V6 COF is the same as 42V5...

Страница 17: ...K CAPACITOR DIODE IC LINEAR RESISTOR TRANSISTOR FETS description Attached at Z B D and Y B D make Sustain waveform Sustainer supply a square wave to panel to make a video 9 IPM Intelligent Power Module 3 Basic IPM Sustain Step ...

Страница 18: ...ck PSU output Va Vs 5v Check Y Z b d input voltage Replace ctrl b d Replace Y Z b d Check panel appearance Check COF Replace ctrl b d Replace X b d Check FPC Replace Y drv b d Replace Y sus b d Replace ctrl b d Replace Y drv b d Replace Y sus b d 4 Trouble shooting N Y Y Y Y N Fast check up Include exhausting tip GLASS crack Check all FUSE N Replace ctrl b d ...

Страница 19: ...ct vertical defect mal discharge on screen No display Please follow the no display trouble shooting N Bar defect appeared Line defect Y Please follow bar defect trouble shooting N N Y Please follow the line defect trouble shooting Y Please follow the mal discharge trouble shooting ...

Страница 20: ...to the next section 4 Trouble shooting No display 1 Connector Confirm every Connector PSU Y SUS CTRL Z SUS module may not be normal by mis connection which can not send signal and power Also Mis connection for a long time has a specific b d failed Signal input LVDS CTRL B D Y SUS CTRL B D Z SUS X B D X B D ...

Страница 21: ...m state of panel If there is problem replace the module in case of vacuum breakdown module makes a shaking noise because of inside gas ventilation there may be a small crack which could not see with naked eyes And this noise is different from Capacitor noise 2 Exhaust tip Crack NORMAL CRACKED ...

Страница 22: ... converted from AC V to DC V voltage Check 5V Va Vs When PSU Protection occurred Check Short between Y SUS Z SUS B D 3 PSU Power Supply Unit SW Normal Vs Voltage ADJ Vs About 180 195 V Va Voltage ADJ Va About 55 65 V if not same Confirm input voltage Adjust voltages 4 Trouble shooting Multi meter Touch point 5V Va Vs must accord with Module Label ...

Страница 23: ... not CHECK OSC X1 output 3 Check CTRL input voltage 4 CHECK 3 3V 5V 5 Check IC 404 3 3V IC 54 2 5V 4 Ctrl B D Probe Touching point Input voltage Diode OSC X2 4 Trouble shooting P300 Check oscillating state normal 100 MHZ Be careful with physical shock ...

Страница 24: ...een GND and Y SUS output SUSUP OC2 SUSDN OC1 forward 0 4 reverse OVERLOAD 4 Check whether output voltages agrees with voltage that represented in label setdn Vy FS2 4 Trouble shooting F2 Vs FUSE 6 3A Vscw setup Ve Vsetup Check whether output voltages agrees with voltage that represented in label ...

Страница 25: ...us B D Va FUSE 6 3V Vs FUSE 6 3A 1 Check the FUSE 2 Check input voltages Va 5V Vs 3 Check FPC out put diode value 4 Check ramp waveform Check the FUSE Check input voltages Variable resistor of Z RAMP waveform slope Variable resistor ...

Страница 26: ...26 39 4 Trouble shooting FPC Separating Separate the fixed Screw of Z Board Pull out Lock as shown in arrow Pull FPC Connector as shown in arrow Condition in Lock part is pulled ...

Страница 27: ...omatically within 2 3 min from power on Power protection function protect the boards when occurred short on circuits of PDP module or power problem If can not impress power even after replacing PSU find out where the short occurred PSU makers DAEGIL PSU diode on board ORIGIN PSU No diode ...

Страница 28: ...fect bar Check each section with following method if there is problem replace or repair that part If not go to the next section 1 Connector Check COF connector If not connected well it will Make a bar defect Bar Check here Check here Off ...

Страница 29: ... Trouble shooting 2 Checking COF Confirm whether COF was torn And then check input of COF resistor and IC COF 6 is torn partly Tearing COF Separating Lift up lock as shown in narrow Pull COF as shown in narrow ...

Страница 30: ...stor With Digital multi meter DMM If the resistor is normal the resistor value will be 10 2 10 8 Ω But if not the value will be 0 or infinity and replace the resistor 4 Trouble shooting Resistor COF short circuit check Check the short circuit between Va and GND short If it is short cof is failed Va GND ...

Страница 31: ...o check 1 contact DMM terminal to a right terminal of condenser GND and DMM terminal to a right terminal of IC normal value is 0 68 fig 1 2 contact DMM terminal to Output terminal of resistor and DMM terminal to a right terminal of IC normal value is 0 745 fig 2 Fig 1 Fig 2 Checking address COF input of resistor and IC 4 Trouble shooting Confirm this position ...

Страница 32: ...output A flow of address signal In this figure we can easily suppose what will be appeared on screen when a specific part failed Diagram of ctrl b d 3 Ctrl B D CTRL B D supplies video signal to COF So if there is a bar defect on screen It may be the ctrl b d problem 4 Trouble shooting ...

Страница 33: ...hort Line open or short with same distance 1 line open 1 electrode open This is an MCM of Ctrl b d defect MCM can not be replaced separately So replace the ctrl b d In case of 1 line open or short check foreign substances in COF connector First blow up the connector with your mouth to remove foreign substances which may be on it And then if the same line appears replace the panel MCM Multi Chip Mo...

Страница 34: ...s Case 1 Buffer IC fail COF IC 1 2 192 line 96 96 open COF IC 3 4 64 16 ⅹ 4 line open with fixed interval there is on off Repetition 16 line open case 2 Array resistor fail COF IC1 16 line COF IC2 16 line open 96 line open case3 COF IC fail 96 line open ...

Страница 35: ...nd rear panel electrode defect or panel electrode open short replace the panel 1 Connector It can make a horizontal bar that connector on Y b d and Z b d did not plugged well Because sustain voltage can not be supplied to panel So check connectors FPC Y drv Y drv first Horizontal bar Disconnected Disconnected Screen off ...

Страница 36: ... IC check Check diode value of the right side part of output pin Normal diode value in case of TI IC 0 6 0 7 It can be Defect diode value 0 018 different from each IC Maker Check here with DMM either forward or reverse is ok DMM DMM ...

Страница 37: ...ide ctrl b d Y b d is just normal First sweep the FPC electrode with a clean cloth or blow up the electrode to remove particles And then check the FPC and panel with your eyes FPC electrode open Panel electrode Insulation break down Horizontal 1 line 2 Check scan IC Check with a same way that presented in Horizontal bar ...

Страница 38: ... mal discharge appearance is problem of y drv y z b d check these boards when occurred Checking order 1 Confirm Y Z SUS signal cable 2 Check Y DRV IC FAIL 3 Check Y sus b d voltages Vy Vscw 4 Check Y Z SUS IPM fail 5 Replace CTRL b d Mal discharge ...

Страница 39: ...t 1 GND Sus out 2 Sus out Vs 3 ER DN ER COM 4 ER COM ER UP when each 4 nodes TEST Diode value is infinity OK Specially the value of ER UP COM DN in the Y Z board should be checked all of them but the terminal of Vs Sus out GND we just check one of IPM because it is parallel Æ if no problems check 15V Y Z B D with GND Î Forward value 0 3V Reverse value infinite If no problems ...

Страница 40: ...PCB B D defect only Serial No X L TOP UP X C TOP X R TOP PSU X L BTM LOW X C BTM X R BTM DC DC Y SUS Y DRV TOP Y DRV BTM CTRL Z SUS etc No the last line number of white label on B D Issued place Office or living room Condition in use Use as monitor Detailed repair records and the result including date Replace Control Board 2004 04 06 Not improved COF defect only Serial No Ex Long 2 4 IC Fail or Re...

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