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LG 42LS570T Service Manual
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Standard Repair Process Detail Technical Manual
LCD-T
V Version checking met
hod
A. Video error_Video error, video lag/stop
1. Checking method for remote controller for adjustment
Press the IN-START with the remote
controller for adjustment
Version
<ALL MODELS>
A7
Established
date
Revised
date
Error
symptom
Content
LCD TV
2010. 12 .14
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
102
104
Table of Contents
Service Manual
1
Table of Contents
2
Safety Precautions
3
Important Safety Notice
3
General Guidance
3
Leakage Current Hot Check
3
General Servicing Precautions
4
Electrostatically Sensitive (ES) Devices
4
General Soldering Guidelines
4
Servicing Precautions
4
IC Remove/Replacement
5
"Small-Signal" Discrete Transistor Removal/Replacement
5
Power Output, Transistor Device
5
Diode Removal/Replacement
5
Application Range
6
Requirement for Test
6
Specification
6
RGB Input (PC)
8
Component Video Input
8
HDMI Input
9
DTV Mode
9
PC Mode
9
Automatic Adjustment
10
ADC Adjustment
10
Adjustment Instruction
10
Lan Port Inspection
11
LAN Inspection Solution
11
Lan
11
Model Name & Serial Number Download
12
Model Name & Serial Number D/L
12
CI+ Key Checking Method
12
Wifi Mac Address Check
12
Manual Adjustment
13
Download Method
13
Edid Data
13
Manual Adjustment. Method
14
White Balance Adjustment
14
Auto Adj. Method
14
Equipment Connection MAP
14
EYE-Q Function Check
15
Local Dimming Function Check
15
Magic Motion Remote Control Test
15
LED White Balance Table
15
3D Function Test
16
Wi-Fi Test
16
LNB Voltage and 22Khz Tone Check
16
Option Selection Per Country
16
GND and Internal Pressure Check
17
Audio
17
USB S/W Download
17
Screw Specification and Application Situation
18
Screw Assembly Working Guide
18
Block Diagram
19
Exploded View
20
2012 LED/LCD TV Engineering Guide
51
EPI Interface
53
Topology
53
EPI Interface (Mini-LVDS Vs. EPI)
54
Comparison
54
HF Mini-LVDS
54
EPI (Embedded Clock P-To-P Interface)
54
Main PCB for Broadband
56
MTK5369 Block Diagram( LM76 )
57
Jack Interface
58
GP4 Backend Block Diagram (EPI & T-Con)
59
GP4 Backend Block Diagram (LVDS Tx & Local Dimming)
61
Interconnection
62
Pcbs
62
Cables
62
KEY1, KEY2 Voltage
63
Pin Configuration
63
Circuit Block Diagram
63
2012Y IR + Soft Touch PCB Pinmap
63
2012Y IR + Soft Touch LED Lighting Scenario
64
Power LED Scenario
64
Introductions of GP4 Sensor (Touch IC)
65
Manual of Touch Sensitivity
65
Touch Key Threshold Level
65
Touch EEPROM Register Change with USB Port
66
Introductions of 12Y RF Ass’y + Magic Remote Control
67
System
68
Remote Buttons (M3 Vs. M4)
69
Mute Power
69
M4 Block Diagram
70
Function List
71
RF Pairing / Un-Pairing Method
72
Introductions of 12Y WIFI Built in Ass’y
73
WIFI Built in Ass’y Feature(LGIT)
74
WIFI Built in Feature
74
WIFI Built in Block-Diagram(Arcadyan)
75
WIFI Built in Ass’y Specification
76
12Y Widevine & HDCP 2.0 & NETFLX
77
Changed BOM
81
Current
81
Contents of LCD TV Standard Repair Process
83
Video Error
85
No Video/ Normal Audio
85
No Video/ no Audio
86
Picture Problem
87
Picture Broken/ Freezing
87
Picture Problem (DVB-S/S2)
88
Tuning Fail, Picture Broken/ Freezing
88
Color Error
89
Vertical/Horizontal Bar, Residual Image, Light Spot
90
External Device Screen Error-Color Error
90
Power Error
91
No Power
91
Off When On, off While Viewing, Power Auto On/Off
92
Audio Error
93
No Audio/ Normal Video
93
Wrecked Audio/ Discontinuation/Noise
94
General Function Problem
95
Remote Control & Local Switch Checking
95
Function Error
96
External Device Recognition Error
96
Circuit Noise, Mechanical Noise
97
Noise
97
Exterior Defect
98
Contents of LCD TV Standard Repair Process Detail Technical Manual
99
Video Error_No Video/Normal Audio
100
Check White Balance Value
100
Video Error_No Video/ Audio
101
Power Board Voltage Measuring Method
101
TUNER Input Signal Strength Checking Method
102
LCD-TV Version Checking Method
103
TUNER Checking Part
105
Adjustment Test Pattern - ADJ Key
106
Exchange T-Con Board
107
Exchange PSU(LED Driver)
109
Exchange the Module
110
Un-Repairable Cases
110
Standard Repair Process Detail Technical Manual
112
Power Error _No Power
112
Check Front Display LED
112
Check Power Input Voltage and ST-BY 5V
113
Checking Method When Power Is on
114
POWER off MODE Checking Method
115
Checking Method in Menu When There Is no Audio
116
Voltage and Speaker Checking Method When There Is no Audio
117
Checking Order When There Is no Audio
117
Remote Controller Operation Checking Method
118
VCOM Adjustment
119
Sequence of the Vcom Adjustment
119
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LG 42LS570T Specifications
General
Brand
LG
Model
42LS570T
Category
LCD TV
Language
English
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