LG CMS4540F/W Service Manual

6. POWER AMP PART CHECK
POWER AMP PART CHECK
Refer to SMPS troubleshooting.
NO
Check
CN501 Pin10: +12 V
Pin1,2,3: 37 V.
YES
YES
Check IC701, IC702
Pin29, 30, 31, 36, 37, 38 input voltage.
YES
Check each line resistor output voltage.
NO
Check IC701, IC702
Pin2: +12 V input.
Check IC701, IC702
Pin27, 28, 32, 35, 39, 40.
Replace the coil.
NO
Check output
line coil.
Check PWM Modulator input
IC701 Pin5, 6, 14, 15 / IC702 Pin5, 6.
YES
YES
YES
YES
OK
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AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

LG CMS4540F/W Specifications

General

Brand	LG
Model	CMS4540F/W
Category	Stereo System
Language	English