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SPJ4B-W
LG SPJ4B-W Service Manual
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Copyright © 2017 - 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
3
2
1
Figure 1-2 (2)
Figure 1-2 (1)
HOW TO DISASSEMBLE THE MAIN UNIT
2) Remove the screw.
3) Remove the Main Frame Assembly (Main Chassis + PCBA).
1-2. Main Frame Assembly
1) Disconnect the 2 harness cables from the Main PCB Assembly.
Main Frame Assembly
FL
FR
19
21
Table of Contents
Section 1 General
3
Table of Contents
3
Esd Precautions
4
Name of each Component
5
Wireless Subwoofer Connection
6
Rear Speakers Connection (Sold Separately)
7
About Led Condition
8
Hidden Key Mode
9
Software Update Guide
10
Specifications
16
Section 2 Cabinet & Main Chassis
18
Disassembly Instructions
19
How to Disassemble the Main Unit
20
How to Disassemble the Woofer
26
Exploded Views
28
Main Unit Section
28
Wireless Subwoofer Section
29
Packing Accessory Section
30
Section 3 Electrical
32
Wiring Diagram
33
Block Diagrams
34
System Block Diagram
34
Power Block Diagram
35
One Point Repair Guide
36
Set Doesn't Booting When You Turn on the Set
36
Sound
39
Protection Error
44
Waveforms of Major Check Point
47
Crystal
47
Flash Memory
47
Tact Key
48
Usb
49
Remote Control
50
Optical
51
Portable
52
Circuit Voltage Chart
54
IC Voltage
54
Capacitor Voltage
54
Connector Voltage
54
Printed Circuit Board Diagrams
55
Main P. C. Board Diagram
55
Front P. C. Board Diagram
56
Key P. C. Board Diagram
56
Section 4 Wireless Subwoofer Part
58
Wiring Diagram
59
Block Diagram
60
One Point Repair Guide
61
Power on Error
61
Wireless Connection
63
Waveforms of Major Check Point
64
Crystal
64
Flash Memory
64
Voltage
65
Amp Voltage
66
Pwm
67
Led
68
Circuit Voltage Chart
70
Printed Circuit Board Diagrams
71
Woofer Smps & Amp P. C. Board
71
Section 5 Wireless Receiver Part (Option)
72
Wiring Diagram
73
Block Diagram
74
One Point Repair Guide
75
Electrical Troubleshooting Guide
77
Waveforms
78
Printed Circuit Board Diagrams
80
Wireless Receiver Smps P. C. Board
80
Wireless Receiver Amp P. C. Board
81
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LG SPJ4B-W Specifications
General
Brand
LG
Model
SPJ4B-W
Category
Speaker System
Language
English
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