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S55A1-D
LG S55A1-D Service Manual
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3-2
ONE POINT REPAIR GUIDE
1. NO POWER PROBLEM (PVDD)
No power problem occurs when you power on the unit
1-1. Solution
Replace SMPS board.
1-2. How to troubleshoot (Countermeasure)
1) Check the PVDD voltage 18.7 V at pin1, 2, 3.
When you check the no power at this point, then replace SMPS board.
1-3. Service hint (Any picture / Remark)
< MAIN board top view >
PVDD
PVDD
18
20
Table of Contents
Section 1 General
3
Table of Contents
3
Esd Precautions
4
Wireless Subwoofer Connection
5
Hidden Key Mode
6
Mcs / Eq Hidden Key Guide
7
Mcs / Eq Program Update Guide
8
Specifications
9
Section 2 Cabinet & Main Chassis
10
Disassembly Instructions
11
Exploded Views
14
Main Set Section
14
Wireless Subwoofer Section
15
Packing Accessory Section
16
Section 3 Electrical
18
One Point Repair Guide
19
Power Problem (Pvdd)
19
Power on Error
20
Sound (Portable Function)
21
Wireless
22
Bluetooth
23
Sound (Usb)
24
Sound (Optical)
25
Hdmi Problem
26
Waveforms of Major Check Point
27
Crystal
27
Flash Memory
28
Tact Key
29
Usb
30
Remote Control
31
Optical
32
Portable
33
Audio Pwm
34
Audio Amp
36
Wiring Diagram
38
Block Diagram
39
Circuit Diagrams
40
Smps Circuit Diagram
40
Main - Dsp Circuit Diagram
41
Main - Pwm & Amp Circuit Diagram
42
Main - Power Circuit Diagram
43
Hdmi & Jack Circuit Diagram
44
Front Circuit Diagram
45
Tact Key Circuit Diagram
46
Circuit Voltage Chart
47
Printed Circuit Board Diagrams
48
Smps P. C. Board Diagram
48
Main P. C. Board Diagram
49
Hdmi & Jack P. C. Board Diagram
50
Front P. C. Board Diagram
50
Tact Key P. C. Board Diagram
50
Section 4 Wireless Subwoofer Part
52
One Point Repair Guide
53
Power Problem (Pvdd)
53
Power on Error
54
Wireless Connection
56
Waveforms of Major Check Point
57
Voltage
57
Amp Voltage
58
Pwm
59
Led
60
Wiring Diagram
62
Block Diagram
63
Circuit Diagrams
64
Woofer Smps Circuit Diagram
64
Woofer Amp Circuit Diagram
65
Woofer Key Circuit Diagram
66
Printed Circuit Board Diagrams
67
Woofer Smps P. C. Board
67
Woofer Amp P. C. Board
68
Woofer Key P. C. Board
68
Other manuals for LG S55A1-D
Owner's Manual
59 pages
Simple Manual
2 pages
4
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LG S55A1-D Specifications
General
Brand
LG
Model
S55A1-D
Category
Speaker System
Language
English
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