LG CM4520 Service Manual

2. μ-COM PART CHECK
μ-COM PART
CHECK
Refer to
SMPS troubleshooting.
NO
Check if
voltage of CN105 Pin10
is 3.7 VA.
Check if output of
D105(MBR0540) is 3.7 V.
NO
Check
both end voltage of
D102, D105.
Check if IC102_Pin49 and
IC102_Pin36,59 are 3.5 V.
YES
Check D102, D105.
Replace D102, D105.
NONO
X101: 32.768 kHz
X102: 9.8304 MHz
Check the operation.
OK
YES
YES
YES
YES
YES
OK
3. IC101(M24C16) CHECK
CHECK
IC102 PIN47,48
Refer to μ-COM troubleshooting.
NO
Pin47: DATA
Pin48: CLK.
Replace μ-COM.
NO
YES
Check μ-COM
voltage 3.5 V.
Check μ-COM.
YES
OK OK
YES
YES
NO
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AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

LG CM4520 Specifications

General

Brand	LG
Model	CM4520
Category	Stereo System
Language	English