DOWNLOAD LG 47LW9800-SA (CHASSIS:LJ12D) Service Manual ↓ Size: 21.05 MB | Pages: 109 in PDF or view online for FREE

Model
47LW9800-SA (CHASSIS:LJ12D)
Pages
109
Size
21.05 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
47lw9800-sa-chassis-lj12d.pdf
Date
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LG 47LW9800-SA (CHASSIS:LJ12D) Service Manual ▷ View online

ⓒ LG Electronics. Inc.2009
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
ⓒ LG Electronics. Inc.2009
Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
Error symptom
Content
Page
Remarks
21
B. Power error_No power
Check front display LED
A17
22
Check power input Voltage & ST-BY 5V
A18
23
Checking method when power is ON
A19
24
POWER BOARD voltage measuring method
A4
25
26
B. Power error_Off when on, off while 
viewing
POWER OFF MODE checking method
A22
27
B. Power error_Off when on, off while 
viewing
POWER BOARD PIN voltage checking 
method
A19
28
C. Audio error_No audio/Normal video  
Checking method in menu when there is no 
audio
A24
29
Voltage and speaker checking method when 
there is no audio
A25
30
C. Audio error_Wrecked
audio/discontinuation
Voltage and speaker checking method in 
case of audio error
A25
31
D. Function error_ No response in 
remote controller, key error
Remote controller operation checking 
method
A27
32
D. VCOM Adjustment
Sequence of the Vcom adjustment
A28
Continued from previous page
ⓒ LG Electronics. Inc.2009
Established 
date 
Standard Repair Process Detail Technical Manual
Revised 
date 
A1
Error 
symptom
Content
Check LCD back light with naked eye
A. Video 
error_No
video/Normal audio 
After turning on the power and disassembling the case, check with the naked eye, 
whether you can see light from 4 locations.
<ALL MODELS>
LCD  TV
A1
2010. 12 .14
ⓒ LG Electronics. Inc.2009
Standard Repair Process Detail Technical Manual
LED driver  B+ 24V measuring method
A. Video error_No video/Normal audio 
A2
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
A2
Check the DC 24V, 12V, 3.5V and Inverter on
ALEF LED 
Edge LED
P-dim
A-dim
Inverter ON
Error
GND
24V
P203
14
13
12
11
6~10
1~5
P-dim
A-dim
Inverter ON
Error
GND
24V
P202
14
13
12
11
6~10
1~5
2010. 12 .14
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