LG 55LN57XX / 55LN5758 / 55LN575S / 55LN575V (CHASSIS:LD33B) Service Manual ▷ View online
40 / 88
Standard Repair Process Detail Technical Manual
LCD TV connection diagram (1)
A. Video error _Vertical/Horizontal bar, residual
image, light spot
As the part connecting to the external input, check the screen condition by signal
A8
Established
date
Revised
date
Error
symptom
Content
LCD TV
<ALL MODELS>
2012. 12 .06
41 / 88
Checking method:
1. Check the signal strength or check whether the screen is normal when the external device is connected.
2. After measuring each voltage from power supply, finally replace the MAIN BOARD.
Standard Repair Process Detail Technical Manual
TUNER checking part
A. Video error_Video error, video lag/stop
<ALL MODELS>
A9
Established
date
Revised
date
Error
symptom
Content
LCD TV
2012. 12 .06
42 / 88
Standard Repair Process Detail Technical Manual
Adjustment Test pattern - ADJ Key
A. Video error_Color error
You can view 6 types of patterns using the ADJ Key
Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..)
4.Video error (Classification of MODULE or Main-B/D!)
A12
Established
date
Revised
date
Error
symptom
Content
LCD TV
2012. 12 .06
43 / 88
Solder defect, CNT Broken
T-Con Defect, CNT Broken
T-Con Defect, CNT Broken
T-Con Defect, CNT Broken
Solder defect, CNT Broken
Solder defect, CNT Broken
Solder defect, CNT Broken
Solder defect, CNT Broken
Abnormal Power Section
Solder defect, Short/Crack
Abnormal Power Section
Solder defect, Short/Crack
Appendix : Exchange EPI Cable or Main B/D (1)
Click on the first or last page to see other 55LN57XX / 55LN5758 / 55LN575S / 55LN575V (CHASSIS:LD33B) service manuals if exist.