LG CM4540 Service Manual

CD FUNCTION
YES
Can the
disc insert?
NO
Is Motor_open/close
OK? (IC408 Pin6,7)
NO
Refer to function
check.
YES
Disc reading
is ok?
Is no signal at spk?
YES
Is Motor ok?
(about 12 Ω)
Is load +,- ok?
YES
Check
the signal of
IC407 Pin52,53,54.
NO
YES
Check
the signal (16.0344 MHz)
at IC407
Pin51.
NO
YES
Check IC501
input/output and
control line.
NO
YES
YES
Check loading motor.
NO
IM driving (Focus and
tracking) is ok?
NO
Focus/
tracking/sled signal
is ok?
NO
Check IC408
(Motor drive IC).
NO
Is the MD(CN404
Pin22) about 190 mV?
YES
Check Vcc of IC407.
Check Cristal (X400).
NO
Replace Cristal
(X400).
Replace IC501.
Check IC408.
YES
1. CD FUNCTION
Check IM
(pick-up).
NO
3-27
CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

LG CM4540 Specifications

General

Brand	LG
Model	CM4540
Category	Stereo System
Language	English