LG SJ2 - Page 48

4-3
SMPS POWER CIRCUIT
YES
YES
YES
YES
YES
No 3.3 VA
Check 3.3 VA network, the device
a short circuit will cause no output.
Check SMPS.
Check Q203.
Check IC300.
Check U201.
NO
NO
NO
NO
Check C940 voltage 24 V.
Check Q203 voltage 3.3 V.
Check IC300 voltage 3.3 V.
Check U201 pin8, 31
voltage 3.3 V.
ELECTRICAL TROUBLESHOOTING GUIDE