LG 47LM8600 / 47LM8650 (CHASSIS:LA23E) Service Manual ▷ View online
Interconnection – sub PCB( XXLM9600 Series )
RF MOTION ASSY
To Main
SPK unit
3
WIFI ASSY
4
RF MOTION ASSY
5
Local Key
PCB
1
IR Key PCB
Speaker cover Assy
IR PCB
WIFI ASSY
Contents of LCD TV Standard Repair Process
No.
Error symptom (High
category)
category)
Error symptom (Mid category)
Page
Remarks
1
A. Video error
No video/Normal audio
1
2
No video/No audio
2
3
Picture broken/ Freezing
3
4
Color error
4
5
Vertical/Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
5
6
B. Power error
No power
6
7
Off when on, off while viewing, power
auto on/off
auto on/off
7
8
C. Audio error
No audio/Normal video
8
9
Wrecked audio/discontinuation/noise
9
10
D. Function error
Remote control & Local switch checking
10
M4 operating checking
11
11
12
Wifi operating checking
12
13
External device recognition error
13
14
E. Noise
Circuit noise, mechanical noise
14
15
F. Exterior error
Exterior defect
15
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
Normal
audio
Y
N
Move to No
video/No audio
video/No audio
No video
Normal audio
Normal audio
Check Back Light
On with naked eye
On with naked eye
On
Y
N
Check Power
Board
24V, 12V,3.5V etc.
Board
24V, 12V,3.5V etc.
Normal
voltage
Y
N
Replace T-con
Board or module
And Adjust VCOM
Board or module
And Adjust VCOM
Repair Power
Board or parts
Board or parts
Check Power Board 24V output
Normal
voltage
voltage
Y
Replace Inverter
or module
or module
N
Repair Power
Board or parts
Board or parts
End
Always check & record S/W Version and White
Balance value before replacing the Main Board
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
※Precaution
Established
date
Standard Repair Process
Revised date
1/15
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
☞A4
☞A1
☞A2
☞A7 & A3
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)
1
2012.01.16
Normal
voltage?
Check various
voltages of Power
Board ( 3.5V,12V,20V
or 24V…)
voltages of Power
Board ( 3.5V,12V,20V
or 24V…)
No Video/
No audio
No audio
Check and
replace
MAIN B/D
replace
MAIN B/D
Y
Replace Power
Board and repair
parts
Board and repair
parts
N
End
Standard Repair Process
A. Video error
No video/ No audio
☞A4
Established
date
Revised date
2/15
LCD TV
Error
symptom
2
2012.01.16
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