LG FH6 - Page 41

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2. POWER SUPPLY ON MAIN BOARD
ELECTRICAL TROUBLESHOOTING GUIDE
No 3.3 V
No 3.3 VA
Check 5.5 VA on SMPS board.
Check 5.5 VA on SMPS board.Check IC303 and replace.
Check IC501 pin150
(PWR_CTRL).
Check or replace D302.
Check or replace D301 & D304.
Check or replace D301 & D304.
Check IC304 and replace.
Is the
VCC supplied to IC304
pin3?
Is the
VCC supplied to IC303
pin3?
Is D302 normal?
Are D301 & D304
normal?
Are D301 & D304
normal?
Is there
signal at IC304
pin2 ?
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YESYES
YES
YES