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LG SPJ2B-W Service Manual
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3-9
ELECTRICAL TROUBLESHOOTING GUIDE
4. PORTABLE FUNCTION
YES
YES
YES
YES
YES
Portable function
OK
Replace the related part.
Refer to
Power part troubleshooting.
Check IC301.
Check IC301 pin3: 5 V, pin4 3.3 V.
NO
NO
NO
Check JK300.
Check IC301 pin7, 8, 9 SDOUT.
Check IC301 pin13, 14
input waveform.
31
33
Table of Contents
Section 1 Summary
3
Table of Contents
3
Product Safety Servicing Guidelines for Audio Products
4
Servicing Precautions
5
General Servicing Precautions
5
Insulation Checking Prodedure
5
Electrostatically Sensitive (Es) Devices
5
Name of each Component
6
Wireless Subwoofer Connection
7
Hidden Key Mode
8
Software Update Guide
9
Specifications
10
Section 2 Cabinet & Main Chassis
12
Disassembly Instructions
13
How to Disassemble the Main Unit
14
How to Disassemble the Subwoofer
18
Exploded Views
20
Main Unit Section
20
Wireless Subwoofer Section
21
Packing Accessory Section
22
Section 3 Electrical
24
One Point Repair Guide
25
Power Problem
25
Speaker no Audio Output
26
Usb no Detect
27
Electrical Troubleshooting Guide
28
Smps Power Circuit
28
Key Part
30
Power Amp Part
31
Portable Function
32
Optical Function
33
Usb Part
34
Waveforms of Major Check Point
35
Crystal
35
Amp IC
36
Reset IC
37
Amp Fault
38
Wiring Diagram
40
Block Diagram
41
Circuit Voltage Chart
42
Printed Circuit Board Diagrams
43
Smps P. C. Board Diagram
43
Main P. C. Board Diagram
44
Key P. C. Board Diagram
45
Led P. C. Board Diagram
45
Section 4 Wireless Subwoofer Part
46
Electrical Troubleshooting Guide
47
Smps Power Circuit
47
Led Part
49
Power Amp Part
50
Waveforms of Major Check Point
51
Amp IC
51
Wiring Diagram
52
Block Diagram
53
Circuit Voltage Chart
54
Printed Circuit Board Diagram
55
Smps & Amp P. C. Board Diagram
55
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LG SPJ2B-W Specifications
General
Brand
LG
Model
SPJ2B-W
Category
Speakers
Language
English
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