LG FAS166F User Manual

3-19
ELECTRICAL TROUBLESHOOTING GUIDE
8. PWM MODULATION CHECK
PWM modulation
part check
Refer to
SMPS troubleshooting.
Replace X601.
Replace IC703.
Check IC701(PS9851)
VDD Pin voltage(16,24,29,32,35,40,48).
Check X601 Pin2: 3.3 V.
Check IC701 Pin51 CLK input.
Replace related resistor.
Replace IC500.
Replace IC701.
Check
CN700 Pin1
5 V.
Check
X700 19.2 MHz
operation.
NO
NO
NO
NO
NO
NO
Check
line resistor output
SDA: R153, SCL: R155,
RST: R131.
Check
IC500 DVD MPEG
I2S output.
Check
IC701(PS9851).
IC101
Pin38: PWM RESET
Pin85: PWM SDA
Pin84: PWM SCL
output
Check
IC701(PS9851) data input
Pin14 PWM wave.
Check
PWM modulator output
FL:Pin27(+),28(-) FR:Pin30(+),31(-)
other output
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
OK
OK
OK
OK

LG FAS166F Specifications

General

Brand	LG
Model	FAS166F
Category	Stereo System
Language	English