LG RAT376B Service Manual page 36

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
No PVDD
YES
Is F901 normal?
YES
Is BD901 normal?
YES
Is TH901 normal?
Is Vcc
(10 V ~ 18 V) supplied to
IC902 Pin7?
YES
Is Q902 normal?
YES
Is D929 normal?
YES
Is there about 2.5 V
at IC904 Pin1?
YES
Power line of main PCB is short.
NO
Replace F901 (Use the same fuse).
NO
Replace BD901.
NO
Replace TH901.
NO
Is D905 normal?
YES
Is Q910 base "H"?
YES
• Check P-CTRL "H" signal from μ-COM. •
Check PC902.
Check or replace Q910.
NO
Replace Q902.
NO
Replace D929.
NO
Replace IC904.
3-17
NO
Check or replace D905.
NO