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SPD75A
LG SPD75A Service Manual
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3-9
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
< MAIN board top view >
ONE POINT REPAIR GUIDE
NO SOUND
2-2. OPTICAL
2-2-1. Solution
Replace MAIN board.
2-2-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 VA at L200 of JK202.
2) If 3.3 VA is OK, please check OPT_IN signal(R257) when optical mode.
3) If signal abnormal, replace MAIN board.
2-2-3. Service hint (Any picture / Remark)
JK202
JK202
R257
R257
L200
L200
41
43
Table of Contents
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
18
Disassembly Instructions
21
How to Disassemble the Main Unit
22
How to Disassemble the Subwoofer
26
Exploded Views
28
Main Unit (Sn8) Section
28
Wireless Subwoofer (Spn8-W) Section
30
Packing Accessory Section
32
Wiring Diagram
35
Block Diagrams
36
System Block Diagram
36
Power Block Diagram
37
One Point Repair Guide
38
Booting When You Turn the Unit On, no Message or "Hello" on Front Panel
38
Sound
41
Protection Error
45
Waveforms of Major Check Point
48
Crystal
48
Remote Control
49
Optical
50
Circuit Voltage Chart
52
Printed Circuit Board Diagrams
53
Main P. C. Board Diagram
53
Amp P. C. Board Diagram
54
Front Led P. C. Board Diagram
55
MIC & Touch P. C. Board Diagram
55
Wiring Diagram
57
Block Diagram
58
One Point Repair Guide
59
Power on Error
59
Wireless Connection
61
Waveforms of Major Check Point
62
Crystal
62
Flash Memory
62
Voltage
63
Amp Voltage
64
Pwm
65
Led
66
Circuit Voltage Chart
68
Printed Circuit Board Diagrams
69
Woofer Smps & Amp P. C. Board
69
Wiring Diagram
71
Block Diagram
72
One Point Repair Guide
73
Electrical Troubleshooting Guide
75
Waveforms
76
Printed Circuit Board Diagrams
78
Wireless Receiver Smps P. C. Board
78
Wireless Receiver Amp P. C. Board
79
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Owner's Manual
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LG SPD75A Specifications
General
Brand
LG
Model
SPD75A
Category
Speaker System
Language
English
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