LG MCV903 Series Service Manual

3-16
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
15. PWM MODULATION PART CHECK III (HEAD PHONES)
HP/PWM output waveform
YES
PWM MODULATION
PART CHECK III
Replace the related
part
Replace the related
part
Check the
output waveform at both
terminals of HP :R854,
855,865,864
YES
YES
YES
NO
OK
YES
OK
YES
OK
Check HP/SENS HIGH
YES
Check the
operation condition
of IC802
Check R857,861
Check the
power at both terminals
of R859,860
Check the IC802 ±12V
input power
FL:(-)C859,
FL:(+)C860
FR:(-)C852,
FR:(+)853
YES
Check the
PWM MODULATOR
output HP:/L40(+)41(-)
HP:/R45(+)46(-)
YES
OK
Check Q803 BASE
LOWE
P7302 18PIN,16PIN
Check HP output (check
the abnormal operation
of SIG 0.9V)
NO
NO
NO
NO
NO

LG MCV903 Series Specifications

General

Brand	LG
Model	MCV903 Series
Category	Stereo System
Language	English