LG 55LM610C / 55LM615S / 55LM615T (CHASSIS:LD21B) Service Manual ▷ View online
Contents of LCD TV Standard Repair Process
No.
Error symptom (High category)
Error symptom (Mid category)
Page
Remarks
1
A. Video error
No video/Normal audio
1
2
No video/No audio
2
3
Tuning fail, Picture broken/ Freezing
3, 4
4
Color error
5
5
Vertical/Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
6
6
B. Power error
No power
7
7
Off when on, off while viewing, power
auto on/off
auto on/off
8
8
C. Audio error
No audio/Normal video
9
9
Wrecked audio/discontinuation/noise
10
10
D. Function error
Remote control & Local switch checking
11
11
External device recognition error
12
12
E. Noise
Circuit noise, mechanical noise
13
13
F. Exterior error
Exterior defect
14
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
Error symptom
Content
Page
Remarks
1
A. Video error_ No video/Normal
audio
audio
Check LCD back light with naked eye
A1
2
LED driver B+ 24V measuring method
A2
3
Check White Balance value
A3
4
Power Board voltage measuring method
A4
6
A. Video error_ No video/Video
lag/stop
lag/stop
TUNER input signal strength checking method
A5
7
LCD-TV Version checking method
A6
9
A. Video error_Color
error
LCD TV connection diagram
A7
10
Check Link Cable (LVDS) reconnection
condition
condition
A8
A9
A9
11
Adjustment Test pattern -
ADJ Key
A10
12
A. Video error_Vertical/Horizontal bar,
residual image, light spot
residual image, light spot
LCD TV connection diagram
A8
13
Check Link Cable (LVDS) reconnection
condition
condition
A8
A9
A9
14
Adjustment Test pattern -
ADJ Key
A10
15
<Appendix>
Defected Type caused by T-Con/
Inverter/ Module
Defected Type caused by T-Con/
Inverter/ Module
Exchange T-Con Board (1)
A-1/5
16
Exchange T-Con Board (2)
A-2/5
17
Exchange LED driver Board (PSU)
A-3/5
55” : driver board
Other : PSU
Other : PSU
18
Exchange Module itself (1)
A-4/5
19
Exchange Module itself (2)
A-5/5
Continue to the next page
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
12v,3.5v etc.
Board
12v,3.5v etc.
Normal
voltage
Y
N
Replace T-con
Board or module
Board or module
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
1/14
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
☞A4
☞A1
☞A2
☞A6 & 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,,,)
2012. 01 .14
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
2/14
LCD TV
Error
symptom
2012 . 01
.14
.14
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