LG 55UH615 - Main Board Exchange Procedures (2)

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Abnormal Power Section

Solder defect, Short/Crack

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Solder defect, Short/Crack

Fuse Open, Abnormal power section

Noise

GRADATION

Abnormal Display

Appendix : Exchange Main Board (2)

A - 2/5

Only for training and service purposes

LGE Internal Use Only

Main Page

Contents2
Safety Precautions3
Important Safety Notice3
General Guidance3
Leakage Current Hot Check3
Servicing Precautions4
General Servicing Precautions4
Electrostatically Sensitive (ES) Devices4
General Soldering Guidelines4
IC Remove/Replacement5
Circuit Board Foil Repair5
At IC Connections5
Power Output, Transistor Device5
Specification6
Application Range6
Test Condition6
Test Method6
Module Specification7
External Input Format8
2D Mode8
Component Input8
HDMI Input (PC/DTV)8
3D Mode10
HDMI Input 1.4B10
HDMI 1.4/2.0(3D Supported Mode Manaually)11
HDMI-PC Input (3D)11
RF Input12
USB, DLNA (Movie) Input (3D Supported Mode Manually)12
USB, DLNA (Photo) Input (3D Supported Mode Manually)12
Component Input(3D Supported Mode Manually)13
Miracast, Widi13
Adjustment Instruction14
Automatic Adjustment14
ADC Adjustment14
Equipment & Condition14
Communication Port Connection15
Download Process15
LAN Inspection15
LAN Inspection Solution15
LAN PORT Inspection16
Model Name & Serial Number D/L16
Wifi Mac Address Check16
Using RS232 Command16
Manual Adjustment17
Edid17
Edid Data17
Camera Port Inspection21
V-COM Adjust21
Equipment Connection MAP21
White Balance Adjustment22
Adj. Command (Protocol)22
Auto WB Calibration22
Local Dimming Function Check23
Magic Motion Remocon Test24
3D Function Test24
HDMI ARC Function Inspection24
EYE-Q Green Function Inspection24
GND and Internal Pressure Check25
AUDIO Output Check25
USB S/W Download25
Block Diagram26
K2Lp Circuit Block Diagram26
K2Lp I2C Block Diagram27
K2Lp Power Block28
UH61 Main28
Tuner/CI Block Diagram29
Video/Audio in Block Diagram30
Audio out Block Diagram31
Hdmi32
Usb / Wifi / Uart33
Exploded View34
Wol&Instant on36
DDR Power for Instant on36
Trouble Shooting Guide60
Contents of Standard Repair Process61
Video Error62
No Video/ Normal Audio62
No Video/ no Audio63
Picture Broken/ Freezing64
Color Error65
Vertical/Horizontal Bar, Residual Image, Light Spot66
External Device Screen Error-Color Error66
Power Error67
No Power67
Off When On, off While Viewing, Power Auto On/Off68
Audio Error69
No Audio/ Normal Video69
Wrecked Audio/ Discontinuation/Noise70
Function Error71
Remote Control & Local Switch Checking71
Remote Control(R/C) Operating Error71
MR13 Operating Checking72
Wifi Operating Checking73
Camera Operating Checking74
External Device Recognition Error75
Noise76
Circuit Noise, Mechanical Noise76
Exterior Defect77
Contents of Standard Repair Process Detail Technical Manual78
Check LCD Back Light with Naked Eye80
Check White Balance Value81
TUNER Input Signal Strength Checking Method82
Version Checking Method83
Checking Method for Remote Control for Adjustment83
TUNER Checking Part84
Connection Diagram85
Video Error_Color Error86
Check Link Cable(VX1) Reconnection Condition86
Adjustment Test Pattern - ADJ Key87
Exchange Main Board88
Solder Defect, CNT Broken88
Exchange Power Board (PSU)90
Exchange the Module91
Panel Mura, Light Leakage91
Check Front Power Indicator93
Check Power Input Voltage and ST-BY 3.5V94
POWER off MODE Checking Method95
Checking Method in Menu When There Is no Audio96
Voltage and Speaker Checking Method When There Is no Audio97
Remote Control Operation Checking Method98
Remote Controloperation Checking Method99

LG 55UH615 - Main Board Exchange Procedures (2)

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