Electrical Troubleshooting Guide; Smps Part - LG MCD206 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. SMPS PART

31 V abnormal
F901 nomal?
BD901 nomal?
TH901 nomal?
Is VCC (9V-25V)
supplied to IC901 pin4?
D941 nomal?
Replace ZD908.
YES
YES
YES
YES
YES
NO
NO
Replace F901 (Use same type fuse).
NO
NO
NO
NO
3-2
Replace BD901.
Replace TH901.
Q904 nomal?
NO
Check or replace Q904.
Replace D941.