LG CKS57F Service Manual

3-21
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ELECTRICAL TROUBLESHOOTING GUIDE
5. PWM MODULATION CHECK
PWM MODULATION PART
CHECK
• Check IC700(TAS5548) VDD 3.3 V - Pin9,14.35,50.
• Check X700 (12.288 MHz).
Replace IC700.
Refer to CD troubleshooting.
Check each line resistor output.
Replace X700(12.288 MHz).
OK
OK
OK
Check IC700 Pin21 CLK input.
Refer to
SMPS troubleshooting.
Check CN102
Pin13, 14 (12 VA).
Check
X700(12.288 MHz)
operation.
Check
IC700 input data Pin24, 25
PWM wave.
Check IC700.
Check PWM
modulator output
FL: Pin48(-),49(+)/ FR: Pin46(-),47(+).
WF : 44(-), 45(+) Other output
check.
Check
CD Assy communication
Pin20,21, 22, 23,
24.
Check
IC700 input
data.
Check X700
(12.288 MHz).
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
OK

LG CKS57F Specifications

General

Brand	LG
Model	CKS57F
Category	Stereo System
Number of Discs	1
Tuner	Yes
Channels	2.0
Bluetooth	Yes
USB Port	Yes
FM Radio	Yes
Optical Input	No
HDMI Input	No
Remote Control	Yes
Type	Mini
Playable Media	CD