LG SJ2 - Page 29

3-6
SMPS POWER CIRCUIT
YES
YES
YES
YES
YES
YES
YES
YES
No 3.3 VA
No 1.2 VA
Check 3.3 VA network, the device
a short circuit will cause no output.
Check 1.2 VA network, the device
a short circuit will cause no output.
Check SMPS.
Check SMPS.
Replace IC101.
Replace IC102.
Check IC100.
Replace IC100.
NO
NO
NO
NO
NO
NO
Check FB100 voltage 23 V.
Check FB100 voltage 21 V.
Check IC101 voltage 3.3 V.
Check IC102 voltage 1.2 V.
Check IC100 voltage 5 V.
Check IC100 voltage 5 V.
ELECTRICAL TROUBLESHOOTING GUIDE