DOWNLOAD LG 55LV770S (CHASSIS:LD12D) Service Manual ↓ Size: 14.21 MB | Pages: 86 in PDF or view online for FREE

Model
55LV770S (CHASSIS:LD12D)
Pages
86
Size
14.21 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
55lv770s-chassis-ld12d.pdf
Date
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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
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 : LVDS
A11 : Driver b’d
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
19
Exchange Module itself (1)
A-4/5
20
Exchange Module itself (2)
A-5/5
Continue to the next page
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
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 
P203
1~5
24V
6~10
GND
11
Error
12
Inverter ON
13
A-dim
14
P-dim
P202
1~5
24V
6~10
GND
11
Error
12
Inverter ON
13
A-dim
14
P-dim
2010.12.14
Entry method
1. Press the ADJ button on the remote controller for adjustment.
2. Enter into White Balance of item 6. 
3. After recording the R, G, B (GAIN, Cut) value of Color Temp 
(Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD.
Standard Repair Process Detail Technical Manual
Check White Balance value
A. Video error_No video/Normal audio 
<ALL MODELS>
A3
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
A3
Entry method
1. Press the ADJ button on the remote controller for adjustment.
2. Enter into White Balance of item 7. 
3. After recording the R, G, B (GAIN, Cut) value of Color Temp 
(Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD.
2010.12.14
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