LG SL4Y Service Manual page 42

ELECTRICAL TROUBLESHOOTING GUIDE
ADAPTER POWER CIRCUIT
VCC33 is not 3.3 V
Check F301 Voltage 25 VA
Check FB304 Voltage 12 VA
Check FB305 Voltage 5.1 VA
Check R308 Voltage 3.3 VA
Check FB313 Voltage 3.3 V
OK
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
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3-20
Check Adapter
Replace Main PCB
Replace Main PCB
Replace Main PCB
Replace Main PCB
Only for training and service purposes.