Electrical Troubleshooting Guide; Smps Troubleshooting Flow - LG BP540N Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. SMPS TROUBLESHOOTING FLOW

No 5.3 VA
Is F101 normal?
Is R101 normal?
Is D103/ D104/
D105/ D106 normal?
Is Vcc (13 V ~ 27 V)
supplied to IC101 pin7?
Is D127 normal?
Is there about 2.5 V
at IC103 pin1?
Is IC102 normal?
Is D126, D130 Normal?
Power line of MAIN board is short.
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
Replace F101 (Use the same fuse).
NO
NO
Replace D103/ D104/ D105/ D106.
NO
Check or replace D102.
NO
NO
NO
NO
Replace D126, D130.
3-42
Replace R101.
Is D102 normal?
NO
Replace D127.
Replace IC103.
Replace IC102.