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LG S55A3-D Service Manual
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3-7
ONE POINT REPAIR GUIDE
6. NO SOUND (OPTICAL)
6-1. Solution
Replace IC507 on MAIN board.
6-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 V of 3.3VA at L503.
If you can check 3.3 V, please confirm OPT_DET signal (R5R8) in MAIN board when optical mode.
2) In spite of process 1), set has abnormal output, then replace IC507.
6-3. Service hint (Any picture / Remark)
< MAIN board top view >
JK501
JK501
IC507
IC507
L503
L503
R5R8
R5R8
21
23
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
Exploded Views
12
Main Set Section
12
Wireless Subwoofer Section
13
Packing Accessory Section
14
Section 3 Electrical
16
One Point Repair Guide
17
Power Problem (Pvdd)
17
Power on Error
18
Sound (Portable Function)
19
Wireless
20
Bluetooth
21
Sound (Optical)
22
D(DC) Protection
23
S(Shut Down) Protection
24
B(Burnt) Protection
25
Waveforms of Major Check Point
26
Crystal
26
Flash Memory
27
Tact Key
28
Usb
29
Remote Control
30
Optical
31
Portable
32
Audio Pwm
34
Audio Amp
35
Wiring Diagram
36
Block Diagrams
37
System Block Diagram
37
Power Block Diagram
38
Circuit Diagrams
39
Smps Circuit Diagram
39
Main - Dsp Circuit Diagram
40
Main - Interface Circuit Diagram
41
Main - Pwm & Amp Circuit Diagram
42
Main - Power Circuit Diagram
43
Front Circuit Diagram
44
Circuit Voltage Chart
45
Ics
45
Connectors
46
Printed Circuit Board Diagrams
47
Smps P. C. Board Diagram
47
Main P. C. Board Diagram
48
Front P. C. Board Diagram
49
Section 4 Wireless Subwoofer Part
50
One Point Repair Guide
51
Power Problem (Pvdd)
51
Power on Error
52
Wireless Connection
54
Waveforms of Major Check Point
55
Voltage
55
Amp Voltage
56
Pwm
57
Led
58
Wiring Diagram
60
Block Diagram
61
Circuit Diagrams
62
Woofer Smps Circuit Diagram
62
Woofer Amp Circuit Diagram
63
Woofer Key Circuit Diagram
64
Printed Circuit Board Diagrams
65
Woofer Smps P. C. Board
65
Woofer Amp P. C. Board
66
Woofer Key P. C. Board
66
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Owner's Manual
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LG S55A3-D Specifications
General
Brand
LG
Model
S55A3-D
Category
Speaker System
Language
English
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