LG 42PQ30 - User Manual

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Advanced Single Scan Troubleshooting

Training Manual

42PQ30 Plasma Display

NOTICE:

ALL INFORMATION CONTAINED WITHIN THIS PACKAGE IS

BASED ON PRE-SALES MODEL. INFORMATION SUBJECT TO

CHANGE AT FINAL PRODUCTION

Original February 16

th,

2009

Updated: April 21

, 2010

Main Page

Preliminary Matters (the Fine Print)4
Important Safety Notice4
Esd Notice5
Regulatory Information5
LG Contact Information6
Plasma Overview Section7
Basic Troubleshooting Steps8
42PQ30 Product Information9
42PQ30 Specifications Logo Familiarization11
42PQ30 Specifications Fluidmotion Familiarization13
42PQ30 Remote Control14
Disassembly Section17
42PQ30 Circuit Board Layout19
Disassembly Procedure for Circuit Board Removal20
Getting to the X Circuit Boards23
Left and Right X Drive Removal24
Circuit Operation, Troubleshooting and Circuit Alignment Section27
42PQ30 Plasma Display27
Panel Label Explanation29
Adjustment Notice30
SWITCH MODE POWER SUPPLY Troubleshooting31
Power Supply Board Layout32
Switch Mode Power Supply Overview33
Switch Mode Power Supply Circuit Layout34
Power Supply Basic Operation35
Power Supply Generic Troubleshooting Tips37
Switch Mode Power Supply Static Test40
P813 Odd Pins ID and Voltage and Diode Checks42
Y - SUS Board SECTION (Overview)44
Y - SUS Board Layout45
VSC and - VY Adjustments47
Y - Drive Signal Overview48
Y SUS Block Diagram53
Y - SUS How to Check the Output Fets54
Y - SUS P801 to Z Drive P1 Voltage and Diode Checks57
Y - SUS P207 (Drive Output Plug) TESTING61
Y - SUS FG5V, FG15V and 17V Testing62
Y - Drive Board Section63
Y - Drive Board Buffer Troubleshooting66
Y Drive BUFFER Troubleshooting69
Z - Sus Board Section70
Operating Voltages70
Z - SUS Board Layout71
Z - SUS Waveform72
VZ (Z - Bias) Adjustment73
Z - SUS Block Diagram74
Z - SUS P2 Connector to Control P101 Voltage and Diode Checks76
Control Board Section77
Control Board Identified78
Control Board Testing80
Control LVDS Signals82
Control Board Connector P111 Silkscreen Can be Misleading86
Control P101 to Z - SUS P2 Plug Information88
Left and Right X Boards Section90
TCP 3.3V B+ Check94
Main Board Section99
Main Board Layout and Identification100
Main Board Crystal X1 and X501 Check105
Main Board Plug P1001 to Ft Keys Voltage and Diode Checks108
Main Board Speaker Plug P1005 Voltage and Diode Checks110
Front LED Board Plug J1 to Main Voltage and Diode Checks113
Invisible Speaker Section117

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LG 42PQ30 Specifications

General

Brand	LG
Model	42PQ30
Category	Monitor
Language	English

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Table of Contents

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