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SPH4B-W
LG SPH4B-W Service Manual
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3-16
Copyright © 2021 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ELECTRICAL TROUBLESHOOTING GUIDE
Q301 is not 12 V
Check F301 Voltage 25 VA
Check Adapter
Replace Main PCB
NO
YES
NO
Check FB304 Voltage 12 VA
Check R774
Voltage 12 V
Check Q301 2pin
Voltage 12 V
Check IC302
YES
YES
YES
NO
NO
OK
OK
ADAPTER POWER CIRCUIT
YES
44
46
Table of Contents
Section 1 General
3
Table of Contents
3
Esd Precautions
4
Location of Customer Controls
5
Wireless Subwoofer Connection
6
Rear Speakers Connection
7
Hidden Key Mode
8
Firmware Update Guide
9
Specifications
12
Section 2 Cabinet & Main Chassis
14
Disassembly Instructions
15
How to Disassemble the Main Set
16
Exploded Views
20
Main Unit Section
20
Wireless Subwoofer Section
22
Wireless Receiver Section
24
Rear Speaker Section
26
Packing Accessory Section
28
Section 3 Electrical
30
Wiring Diagram
31
Block Diagrams
32
System Block Diagram
32
Power Block Diagram
33
Booting When You Turn the Unit On, no Message or "Hello" on Front Panel
34
One Point Repair Guide
34
Sound
38
Protection Error
41
Adapter Power Circuit
43
Electrical Troubleshooting Guide
43
Key Part
52
Usb Function
53
Optical Function
54
Crystal
55
Flash Memory
55
Waveforms of Major Check Point
55
Tact Key
56
Usb
57
Remote Control
58
Optical
59
Circuit Voltage Chart
62
Main P. C. Board Diagram
63
Printed Circuit Board Diagrams
63
Key P. C. Board Diagram
64
Section 4 Wireless Subwoofer Part
66
One Point Repair Guide
67
Power Problem (Pvdd)
67
Power on Error
68
Wireless Connection
70
Voltage
71
Waveforms of Major Check Point
71
Amp Voltage
72
Pwm
73
Led
74
Wiring Diagram
76
Block Diagram
77
Printed Circuit Board Diagrams
78
Woofer Smps P. C. Board
78
Woofer Amp P. C. Board
79
Woofer Key P. C. Board
79
Section 5 Wireless Receiver Part
80
Wiring Diagram
81
Block Diagram
82
One Point Repair Guide
83
Electrical Troubleshooting Guide
85
Waveforms
86
Printed Circuit Board Diagrams
88
Wireless Receiver Smps P. C. Board
88
Wireless Receiver Amp P. C. Board
89
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LG SPH4B-W Specifications
General
Brand
LG
Model
SPH4B-W
Category
Speaker System
Language
English
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