LG CM4540 Service Manual

1. POWER (SMPS)
No 5.6 VA
YES
F901 normal? Replace F901 (Use the same fuse).
YES
NO
BD901 normal? Replace BD901.
YES
NO
TH901(TH903) normal? Replace TH901.
YES
NO
Is Vcc
(10 V ~ 18 V) supplied to
IC901 Pin7?
D902 normal?
YES
NO
Check or replace D902.
Is there
about 2.5 V at
IC941 Pin1?
Replace IC941.
YES
NO
D935 normal? Replace D935.
YES
NO
D932 normal? Replace D932.
YES
NO
D931 normal? Replace D931.
YES
NO
D933 / D934 normal? Replace D933 / D934.
YES
NO
Power line of main PCB is short.
NO
3-17
AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

LG CM4540 Specifications

General

Brand	LG
Model	CM4540
Category	Stereo System
Language	English