LG RAT375 - Page 16

3-1
SECTION 3. ELECTRICAL PART
AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
1. POWER (SMPS)
No 3.7 VA
YES
Is F901 normal? Replace the F901 (Use the same fuse).
YES
NO
Is BD901 normal? Replace BD901.
YES
NO
Is TH902 normal? Replace TH902.
YES
NO
Is Vcc
(10 V ~ 18 V) supplied to
IC901 Pin7?
Is D904 normal?
YES
NO
Check or replace D904.
Is there
about 2.5 V at
IC903 Pin1?
Replace IC903.
YES
NO
Is D923 normal? Replace D923.
YES
NO
Is D921 normal? Replace D921.
YES
NO
Is D924 normal? Replace D924.
YES
NO
Is D925 normal? Replace D925.
YES
NO
Is D922 normal? Replace D922.
YES
NO
Power line of I/O PCB is short.
NO