LG 55LW5600 - Troubleshooting Manual

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55LW5600055LW56000

1080P

Direct View LCD

55LW5600055LW56000

LED Backlights

Training

LCD-DV Troubleshooting

55" Class 1080P 120Hz LED

TV SmartTV (54.6" diagonally)

Published July 30

, 2011

Main Page

Overview of Topics3
Safety Notice4
ESD Notice5
Overview7
Safety and Handling Regulations7
Checking Points to be Considered7
Basic Troubleshooting Steps8
Product Information9
Wireless Media Box10
Wireless Network Adaptor11
Basic Specifications12
Key TV Features12
Logo Familiarization13
Remote Control16
TV Rear Input / Output Jacks17
Software Updates (New and Changed Functions)18
Generic Plasma USB Automatic Software Download Instructions19
Manual Software Download20
Product and Service Info. Menu21
Accessing the Host Diagnostic Screen22
Understanding the Host Diagnostic Screen23
Accessing the Service Menu24
Service Menu First Page25
Model Number Download Screen26
To Change the Model Number26
UTT Reset (in START) Screen27
EDID Download Screens28
Product Dimensions29
Passive 3D30
Advantages of Passive 3D31
PR Type of 3D Display32
FPR 3D Display Design33
Polarizer State34
LCD 3D Formatter35
LG 3D TV 3D Broadcasting36
3D for All Types of Broadcasting Signals36
3D Settings Menu37
Disassembly38
Backlight Structure39
Panel Structure and Local Dimming39
LED Array39
Removing the Back Cover40
Circuit Board Layout41
Connector Identification Diagram42
Power Supply Board Removal43
Removing the Main Board44
Removing the T-CON45
Removing LVDS46
Removing Ribbons46
Removing the Front IR Page47
Troubleshooting49
Power Supply50
Power Supply Drawing51
Power Supply Start up Sequence52
Television Turn on Commands Circuit Drawing53
Power Supply Board Low Voltage Tests54
2 Sided Edge Lit Panel (V6) 201156
63V Power Supply for the Backlights Section of the SMPS57
P202 and P203 Backlight Driver Section of SMPS Association with Tps58
P202 / P203 Power Supply Connector Voltage and Diode Check59
Local Dimming Drive Waveforms60
Voltages and Diode Checks61
Power Supply Connector Voltage and Diode Check62
SK100 and AC Fuse Power Supply Voltage and Diode Check63
F101 and F501 Power Supply Voltage Checks64
Main Board65
Main Board Layout66
Main Board (Front and Back Side) Component Layout67
Main Board (Front) Component Layout68
Main (Front Side) Component Voltages69
Main Board (Back Side) Component Layout70
Main (Back Side) Component Voltages71
Main Board X601, X602 and X5201 Crystal Checks72
Audio Amplification for Speakers Information73
Main Board Connector to Speakers Voltage and Diode Check74
Main Board Connector to Power Supply Voltage and Diode Check75
“Main” to “T-CON” Voltage and Diode Check76
Table of Contents77
Main Board to (Ft. Ir/Intelligent Sensor) Voltage and Diode Check78
“Main” to “Motion Remote” (Voltage and Diode Check)79
Main Wireless Media Box Dongle Jack (Voltage and Diode Check)80
TFT-LCD Controller Board81
T-CON (TFT Drive) with (Shield Removed) Components Identified83
T-CON (TFT Drive) Board Panel Test84
CN1 T-CON Connector CN1 to the Main PWB (Voltage and Diode Check)85
CN2 T-CON to the Main PWB (Voltage and Diode Check)86
Txc0P 1.18V 1.13V86
Txc1N 1.23V 1.12V86
Txc1P 1.16V 1.12V86
Txc2N 1.25V 1.10V86
Txc2P 1.16V 1.10V86
- Front (IR, Intelligent Sensor and Power LED)87
- Gaining Access to the Front Ir/Key Board88
- Front IR Component Identification89
- J1 Front Ir/Soft Touch Key Board Voltage and Diode Check90
Gnd Gnd Gnd90
- Soft Touch Key Resistance and Voltages91
- Motion Remote Board92
- Motion Remote Receiver Board Voltage and Diode Check93
Gnd Gnd Gnd93
- Invisible Speaker94
- Interconnect Diagram (11 X 17 Foldout Section)95
- Semiconductors97

LG 55LW5600 - Troubleshooting Manual

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