Amp Power Supply On Smps Board - LG BH9530TW Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

2. AMP POWER SUPPLY ON SMPS BOARD

No 36 VA / 26 VA
Is the P-CTL normal?
Is the VCC
(11 V ~ 25 V) supplied to IC902
pin7?
Is IC902 normal?
Is Q901 normal?
Is D928 normal?
Power line of MAIN or AMP PCB is short.
YES
YES
YES
YES
YES
YES
NO
Check MICOM IC.
NO
Check or replace Q910.
NO
NO
NO
2-47
Is Q910 normal?
Replace IC902.
Replace Q901.
Replace D928.