LG W4-4 - Page 64

2-49
ELECTRICAL TROUBLESHOOTING GUIDE
No 12 V (12V_LOADER)
Is the
VCC supplied to IC153
pin2?
Check 14 VA on SMPS board.
YES
YES
NO
Is there
signal at IC153
pin1?
Check IC100 pin68 (LDO_CTRL).
Check IC153 and replace.
YES
NO
No 9.5 V (A9P5V)
Is the
VCC supplied to IC305
pin3?
Check IC153 pin4 (12V_LOADER).
YES
YES
NO
Check IC305 and replace.
Is there signal at IC305 pin1?
YES