LG 47GA6400-UD / 47GA6450-UD (CHASSIS:LA37G) Service Manual ▷ View online
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 locations.
you can see light from locations.
<GA6400-UD>
LCD TV
A1
2011. 12 .14
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 and Inverter on
2011. 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 9.
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.
2011. 12 .14
Standard Repair Process Detail Technical Manual
Power Board voltage measuring method
A. Video error_No video/ Audio
A4
Established
date
Revised
date
Error
symptom
Content
LCD TV
A4
Check the DC 24V, 12V, 3.5V.
2011. 12 .14
GA6400 : 18P
GA7900 : 24P
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