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LG SPJ9B-W Service Manual
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3-14
ONE POINT REPAIR GUIDE
PROTECTION ERROR
No display or No Sound.
3-3. B(BURNT) PROTECTION
3-3-1. Solution
Replace MAIN board.
3-3-2. How to troubleshoot (Countermeasure)
1) Check voltage 20 V of IC706, IC708, IC707, IC710 at pin17, 18, 19, 31, 32, if 12 V has problem refer to
STEP 1-1.
2) If 20 V is OK, replace MAIN board.
3-3-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC710
IC710
IC707
IC707
IC708
IC708
IC706
IC706
50
52
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
17
Section 2 Cabinet & Main Chassis
18
Disassembly Instructions
19
How to Disassemble the Main Unit
20
How to Disassemble the Subwoofer
29
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
Booting When You Turn the Unit On, no Message or "Hello" on Front Panel
42
One Point Repair Guide
42
Sound
46
Protection Error
50
Crystal
52
Waveforms of Major Check Point
52
Flash
54
Tact Key
55
Remote Control
56
Optical
57
Capacitors
58
Circuit Voltage Chart
58
Connectors
58
Ics
58
Printed Circuit Board Diagrams
59
Smps P. C. Board Diagram
59
Main P. C. Board Diagram
61
Hdmi/ Jack P. C. Board Diagram
62
Front P. C. Board Diagram
63
Key P. C. Board Diagram
63
Section 4 Wireless Subwoofer Part
64
Wiring Diagram
65
Block Diagram
66
One Point Repair Guide
67
Power Problem
67
Power on Error (12 V, 5 Va)
69
Power on Error (3.3 Va, 3 V)
70
Wireless Connection
71
Crystal
72
Flash Memory
72
Waveforms of Major Check Point
72
Voltage
73
Amp Voltage
75
Pwm
76
Led
77
Capacitors
78
Circuit Voltage Chart
78
Connector
78
Ics
78
Printed Circuit Board Diagrams
79
Woofer Smps P. C. Board
79
Woofer Amp P. C. Board
80
Woofer Key P. C. Board
80
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LG SPJ9B-W Specifications
General
Brand
LG
Model
SPJ9B-W
Category
Speaker System
Language
English
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