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S35A1-W
LG S35A1-W Service Manual
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3-13
ELECTRICAL TROUBLESHOOTING GUIDE
4. AMP PROTECTION
“S-PROTEC” appears on the FLD.
OK.
Replace IC701.
12 V: CHECK Q701 Part.
32 V: CHECK SMPS Part.
Replace TI AMP IC(IC701, IC702)
Power on.
After unplug power cord, connect again.
“Goodbye”
Display, automatic standby
Is the IC701 pin16, 17
“LOW” signal(0 V)?
Is the AMP IC Power
12 V, 32 V normal?
NO
NO
NO
YES
YES
YES
YES
YES
YES
25
27
Table of Contents
Section 1 General
3
Table of Contents
3
Esd Precautions
4
Hidden Key Mode
5
Service Information for Eeprom
5
Mcs / Eq Hidden Key Guide
6
Mcs / Eq Program Update Guide
6
Specifications
7
Section 2 Cabinet & Main Chassis
8
Exploded Views
10
Main Set Section
10
Subwoofer Section
11
Packing Accessory Section
12
Section 3 Electrical
14
One Point Repair Guide
15
Power Problem (Pvdd)
15
Power on Error
16
Sound (Portable Function)
17
Bluetooth
18
Sound (Optical)
19
Electrical Troubleshooting Guide
20
Power Supply Circuit
20
Front Circuit
21
Test & Debug Flow
23
Amp Protection
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 - Power Circuit Diagram
42
Main - Pwm & Amp Circuit Diagram
43
Display/ Key/ Usb Circuit Diagram
44
Circuit Voltage Chart
45
Printed Circuit Board Diagrams
46
Smps P. C. Board Diagram
46
Main P. C. Board Diagram
47
Display P. C. Board Diagram
48
Key P. C. Board Diagram
48
Usb P. C. Board Diagram
48
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Owner's Manual
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LG S35A1-W Specifications
General
Brand
LG
Model
S35A1-W
Category
Speaker System
Language
English
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