Read LG 42SL90QD-DA (CHASSIS:LT91L) Service Manual online
P800 Pin #7~#10
Voltage Level = 5V ?
P800 Pin #2
Voltage level = 5V ?
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 Q801
MAIN B’D L815 = 3.3V ?
Replace MAIN B’D IC804
YES
NO
MAIN B’D L816 = 1.26V ?
Replace MAIN B’D IC805
YES
NO
MAIN B’D L809 = 1.8V ?
Replace MAIN B’D IC807
YES
NO
Check MAIN B’D X100 Clock
12MHz
Replace MAIN B’D IC100
YES
NO
Replace MAIN B’D IC102
NAND FLASH
YES
Replace MAIN B’D IC103
Serial Flash
NO
Replace MAIN B’D
IC300, IC301 DDR2 Memory
NO
Replace MAIN B’D IC100
NO
Making
전자 - 6-2
Revision
2009. 2 . 1
1/25
LCD TV
Symptom
Power-Up Boot Fail
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