Read LG 42SL8000-ZB / 42SL8500-ZA (CHASSIS:LD91K) Service Manual online
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2. No OSD
P800 Pin #20
Voltage level = 2V
Check Power connector
OK ?
Replace Power Board
YES
NO
YES
P800 Pin #13, 14 = 12V
P800 Pin #17, 18 = 24V ?
NO
Replace Power Board
YES
NO
Replace MAIN B’D Q802
MAIN B’ D L810 = 12V ?
Replace MAIN B’ D Q806
YES
NO
MAIN B’ D C854 = 1.8V ?
Replace MAIN B’ D IC807
YES
NO
MAIN B’ D C833 = 1.26V ?
Replace MAIN B’ D IC802
YES
NO
Check MAIN B’ D X900 Clock
12MHz
Replace MAIN B’ D IC900
YES
NO
Replace MAIN B’ D IC902
Serial FLASH
YES
Replace MAIN B’ D
IC1000, IC1001 DDR2 Memory
NO
P800 Pin #13, 14 = 12V
P800 Pin #17, 18 = 24V ?
P900~T-con LVDS Cable
OK ?
YES
Replace LVDS Cable
NO
Replace MAIN B’D IC900
NO
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