LG SN4A - Page 52

3-23
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ELECTRICAL TROUBLESHOOTING GUIDE
ADAPTER POWER CIRCUIT
No RBOX_3V3
Check F301 Voltage 25 VA
Check FB305 Voltage 5.1 VA
Check Adapter
Replace IC305
YES
YES
YES
NO
NO
Check R371 Voltage 12 VA
Check R373 Voltage 3.3 VA
Replace IC302
Replace IC301
YES
YES
NO
NO
Check C371 Voltage 3.3 V
Replace IC310
YES
NO
OK