Electrical Troubleshooting Guide; Adapter Power Circuit - LG SN4A Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. ADAPTER POWER CIRCUIT

No 3.3 VA
Check F301 Voltage 25 VA
Check R371 Voltage 12 VA
Check FB305 Voltage 5.1 VA
Check R373 Voltage 3.3 VA
OK
YES
YES
YES
YES
YES
NO
NO
NO
NO
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3-15
Check Adapter
Replace IC302
Replace IC305
Replace IC301
Only for training and service purposes.