DOWNLOAD LG 55LM6400 / 55LM6410 / 55LM641Y (CHASSIS:LB22E) Service Manual ↓ Size: 8.27 MB | Pages: 78 in PDF or view online for FREE

Model
55LM6400 55LM6410 55LM641Y (CHASSIS:LB22E)
Pages
78
Size
8.27 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
55lm6400-55lm6410-55lm641y-chassis-lb22e.pdf
Date

LG 55LM6400 / 55LM6410 / 55LM641Y (CHASSIS:LB22E) Service Manual ▷ View online

2012 LED/LCD TV
Engineering guide
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
No video/No audio
2
3
Video error, video lag/stop, fail tunning
3, 4
4
Color error
5
5
Vertical/Horizontal bar, residual image, 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
8
8
C. Audio error
No audio/Normal video  
9
9
Wrecked audio/discontinuation/noise
10
10
D. Function error
No response in remote controller, key error, 
recording error, memory error
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 
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 
TUNER input signal strength checking method
A6
7
LCD-TV Version checking method
A7
9
A. Video error_Color
 
error
LCD TV connection diagram 
A8
10
Tuner Checking Part
A9
11
Check Link Cable (LVDS) reconnection 
condition
A10
A11
A10 : 32/37/42/47/55
A11 : 32 AUO
12
Adjustment Test pattern -
 
ADJ Key
A12
13
A. Video error_Vertical/Horizontal bar, 
residual image, light spot 
LCD TV connection diagram 
A8
14
Check Link Cable (LVDS) reconnection 
condition
A10
A11
A10 : 32/37/42/47/55
A11 : 32 AUO
15
Adjustment Test pattern -
 
ADJ Key
A12
16
<Appendix>
Defected Type caused by T-Con/ 
Inverter/ Module
Exchange T-Con Board (1)
A-1/5
17
Exchange T-Con Board (2)
A-2/5
18
Exchange LED driver Board (PSU) 
A-3/5
55” : driver board
Other : PSU
19
Exchange Module itself (1)
A-4/5
20
Exchange Module itself (2)
A-5/5
Continue to the next page
Normal 
audio
Y
N
Move to No 
video/No audio
No video
Normal audio
Check Back Light
On with naked eye
On
Y
N
Check Power Board
12v,3.5v  etc.
Normal 
voltage
Y
N
Replace T-con Board 
or module
And Adjust VCOM
Repair Power Board 
or parts
Check Power Board 24v output
Normal
voltage
Y
Replace Inverter 
or module
N
Repair Power 
Board or parts
End
Always check & record S/W Version and White 
Balance value before replacing the Main Board
Replace Main Board 
Re-enter White Balance value
※Precaution
Established
date 
Standard Repair Process
Revised date 
1/13
LCD  TV
Error
symptom
A. Video error
No video/ Normal audio 
A4
A1
A2
A28
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,,,)
2010. 12 .14
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