Electrical Troubleshooting Guide; Smps Power Circuit - LG SJ2 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. SMPS POWER CIRCUIT

No 23 V
F900 normal?
NTC900 normal?
BD900 normal?
Is the Vcc (16 V~17 V)
supplied to IC900 pin6?
The IC902 is short.
YES
YES
YES
YES
YES
NO
Replace F900 (same fuse).
NO
NO
Check or replace IC900.
NO
3-5
Replace NTC900.
Replace BD900.
NO
IC900 normal?
YES
OK