Electrical Troubleshooting Guide; System Power Supply On Smps Board - LG S94T1-S Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. SYSTEM POWER SUPPLY ON SMPS BOARD

No 3.8 VA
Is F901 normal?
Is TH901 normal ?
Is BD901 normal?
Is the VCC
(11 V ~ 25 V) supplied to IC901
pin4?
Power line of MAIN PCB is short.
YES
YES
YES
YES
YES
NO
Replace F901 (same fuse).
NO
NO
NO
Is D922 / D923 normal?
Check or replace D922 / D923.
2-44
Replace TH901.
Replace BD901.