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LG SPK8-W Service Manual
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3-9
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ONE POINT REPAIR GUIDE
NO SOUND
2-2. OPTICAL
2-2-1. Solution
Replace JACK board.
2-2-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 VA at FB201.
2) If 3.3 VA is ok, please check OPT_IN signal (R201) when optical mode.
3) If signal is abnormal, replace JACK board.
2-2-3. Service hint (Any picture / Remark)
< JACK board top view >
JK201
JK201
FB201
FB201
45
47
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
8
Rear Speakers Connection (Sold Separately)
9
Woofer & Rear Pairing Method
10
Hidden Key Mode
11
Software Update Guide
12
Specifications
15
Section 2 Cabinet & Main Chassis
16
Disassembly Instructions
17
How to Disassemble the Main Unit
18
How to Disassemble the Subwoofer
31
Exploded Views
34
Main Unit Section
34
Wireless Subwoofer Section
35
Packing Accessory Section
36
Section 3 Electrical
38
Wiring Diagram
39
Block Diagrams
40
System Block Diagram
40
Power Block Diagram
41
One Point Repair Guide
42
Booting When You Turn the Unit On, no Message or "Hello" on Front Panel
42
Sound
45
Protection Error
49
Waveforms of Major Check Point
52
Crystal
52
Flash
53
Remote Control
54
Optical
55
Circuit Voltage Chart
56
Ics
56
Capacitors
56
Connectors
56
Printed Circuit Board Diagrams
57
Smps P. C. Board Diagram
57
Main P. C. Board Diagram
59
Jack P. C. Board Diagram
60
Front P. C. Board Diagram
61
Key P. C. Board Diagram
61
Section 4 Wireless Subwoofer Part
62
Wiring Diagram
63
Block Diagram
64
One Point Repair Guide
65
Power on Error
65
Wireless Connection
67
Waveforms of Major Check Point
68
Crystal
68
Flash Memory
68
Voltage
69
Amp Voltage
70
Pwm
71
Led
72
Circuit Voltage Chart
74
Printed Circuit Board Diagrams
75
Woofer Smps & Amp P. C. Board
75
Section 5 Wireless Receiver Part (Option)
76
Wiring Diagram
77
Block Diagram
78
One Point Repair Guide
79
Electrical Troubleshooting Guide
81
Waveforms
82
Printed Circuit Board Diagrams
84
Wireless Receiver Smps P. C. Board
84
Wireless Receiver Amp P. C. Board
85
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LG SPK8-W Specifications
General
Brand
LG
Model
SPK8-W
Category
Speaker System
Language
English
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