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42LH250C (CHASSIS:LD91Z) - LG TV Service Manual (repair manual). Page 45

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Check Power connector
OK ?
Replace Power Board
NO
YES
Replace Power Board
NO
Replace MAIN B’D IC801
NO
Replace MAIN B’D IC805
NO
Replace MAIN B’D IC806
NO
Replace MAIN B’D IC100
NO
Replace MAIN B’D IC103
Serial Flash
NO
Replace MAIN B’D 
IC300, IC301 DDR2 Memory
NO
Replace MAIN B’D IC100
NO
Making 
Revision 
2009. 2 . 1
LCD TV
Symptom
Power-Up Boot Fail
19~22LH250C
P801 Pin #5~#6
Voltage Level = 5V ?
YES
P801 Pin #1, 2 = 15V?
MAIN B’D L803 = 3.3V ?
YES
MAIN B’D L813 = 1.26V ?
YES
MAIN B’D L805 = 3.3V ?
YES
Check MAIN B’D X100 Clock
12MHz
YES
Replace MAIN B’D IC102
NAND FLASH
YES
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