LG MCD23 User Manual

3-5
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
8. PWM MODULATION PART CHECK
P7905 PIN9,10
3.3V Check
PWM MODULATION
PART CHECK
Refer to SMPS
Troubleshooting
NO
NO
NO
Check
X601 12.288MHz
Operation.
IC604
PIN86 CLK INPUT
Check
Check
IC100(LC87Fxx)
PIN22:PWM REST
PIN79:PWM SDA
PIN80:PWM SCL
OUTPUT
YES
YES
YES
YES
YES
YES
YES
YES
Check
IC604(PS9830)
DATA INPUT PIN23
PWM WAVE
Check.
Check PWM
Modulator output
FL:PIN75(+),74(-)
FR:PIN71(+),70(-)
OTHER OUTPUT
Check
Check IC604(PS9830)
VDD PIN VOLTAGE
(3,10,22,29,39,47,56,65,72,87,94)
Check X601 PIN2 :3.3V
OK
Replace X601.
NO
YES
Check X601
12.288MHz
OK
Replace R671,R670,R665
NO
YES
Check LINE
Resistor output
SDA:R671,SCL:R670
RST:R665
Refer to CD troubleshooting
NO
Check
CD ASSY Communication
P7403
Check each LINE
Resistor output
NO
Check
IC604(PS9830) DATA
INPUT
OK
YES
YES
OK
Replace IC604.
NO
Check
IC604(PS9830)
YES
OK
NO
NO

LG MCD23 Specifications

General

Brand	LG
Model	MCD23
Category	Stereo System
Language	English