LG CM4520 Service Manual

1. POWER (SMPS)
No 3.7 VA
YES
F901 normal? Replace F901 (Use the same fuse).
YES
NO
BD901 normal? Replace BD901.
YES
NO
TH901 normal? Replace TH901.
YES
NO
Is Vcc
(10 V ~ 18 V) supplied to
IC901 Pin7?
D904 normal?
YES
NO
Check or replace D904.
Is there
about 2.5 V at
IC903 Pin1?
Replace IC903.
YES
NO
D923 normal? Replace D923.
YES
NO
D921 normal? Replace D921.
YES
NO
D924 normal? Replace D924.
YES
NO
D925 normal? Replace D925.
YES
NO
D922 normal? Replace D922.
YES
NO
Power line of I/O PCB is short.
NO
3-16
AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

LG CM4520 Specifications

General

Brand	LG
Model	CM4520
Category	Stereo System
Language	English