LG PE/PL-43 Service Manual page 22

6. NO POWER ON
Check input voltage of
IC001#6,8,22,40,56,73,75,92
YES
Check IC001 #52,53
(OSC)
YES
Check IC001 #11,12 (SCL,SDA)
YES
Check IC001 #44 (ABN)
HIGH
Check IC001 #34 ( IR ),
#31~38 (Key In)
NO
Check SMPS Board
NO
NO
Replace Q003, Q004
LOW
Check Abnormnal Circuit
NO
Check P004A connector
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Replace X001