Read LG 42SL90QD-DA (CHASSIS:LT91L) Service Manual online
P800 Pin #20
Voltage level = 2V ↑
Check Power connector
OK ?
Replace Power Board
YES
NO
YES
NO
YES
Replace MAIN B’D Q802
MAIN B’D L810 = 12V ?
Replace MAIN B’D Q805
NO
Replace Main Board
YES
P800 Pin #13, 14 = 12V
P800 Pin #17, 18 = 24V ?
Check LVDS Cable
OK ?
YES
Replace LVDS Cable
NO
Making
전자 - 6-2
Revision
2009. 2 . 1
LCD TV
Symptom
No OSD
2/25
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