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LG CM4540 Service Manual
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5. PWM MODULATION CHECK
PWM MODULATION PART CHECK
Check
CN501 Pin7,8
(5.6 V)
• Check IC601(TAS5548)
VDD 3.3 V - Pin9,14.35,50.
• Check X601 (12.288 MHz).
NO
Refer to
SMPS troubleshooting.
Check
X601(12.288 MHz)
operation.
NO
Replace
X601(12.288 MHz).
Check X601
(12.288 MHz).
OK
YES
NO
Check
IC601 Pin21 CLK
input.
Check IC501
(MLC3730)
Pin B3: RESET
Pin A1: SDA
Pin A2: SCL
output.
NO
Replace R53E,R53C,R53B.
Check line
resistor output
RST: R53E / SCL: R53C /
SDA: R53B.
NO
YES
YES
YES
YES
YES
YES
OK
YES
A
3-22
AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
40
42
Table of Contents
Section 1 Summary
3
Table of Contents
3
Servicing Precautions
4
Esd Precautions
6
Hidden Key Mode
7
Service Information for Eeprom
8
Program Download & Update Guide
9
Mcs Program
9
Eq Program
10
Specifications
11
Section 2 Cabinet & Main Chassis
12
Cabinet and Main Frame Section (Cm4540)
14
Exploded Views
14
Mechanism Deck Section (Dp17Tm3)
15
Packing Accessory Section
16
Speaker Section
17
Section 3 Electrical
20
One Point Repair Guide
21
Power
21
Booting When Power on the Set
23
Vfd Is Not Displayed When Power on the Set
24
Operation of MD
26
Sound
31
Audio Electrical Troubleshooting Guide
36
Power (Smps)
36
Ic504(M24C16) Check
39
Mcs Part Check
39
Fld Display Check
40
Pwm Modulation Check
41
Power Amp Part Check
43
Tuner / aux Function Check
44
Tuner Function Check
45
CD Function
46
Cdp Electrical Troubleshooting Guide
46
Double Usb Function
47
Sdram
48
Servo
48
Waveforms of Major Check Point
48
Audio Path
49
Usb
50
Wiring Diagram
52
Block Diagrams
53
System Block Diagram
53
Smps Block Diagram
54
Audio Path Block Diagram
55
Power Diagram
56
Circuit Diagrams
57
Smps Circuit Diagram
57
Main - Dsp Circuit Diagram
58
Main - Servo Circuit Diagram
59
Main - Adc/ Pwm Circuit Diagram
60
Main - Amp Circuit Diagram
61
Front Circuit Diagram
62
Circuit Voltage Chart
63
Ics
63
Capacitors
64
Printed Circuit Board Diagrams
65
Smps P.C.board
65
Main P.C.board
66
Front P.C.board
67
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Owner's Manual
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LG CM4540 Specifications
General
Brand
LG
Model
CM4540
Category
Stereo System
Language
English
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