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S33A1-D
LG S33A1-D Service Manual
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3-7
ELECTRICAL TROUBLESHOOTING GUIDE
1. RECEIVER BAR TROUBLESHOOTING
1-1. POWER SUPPLY ON SMPS BOARD
No 24 VA
Replace F900 (same fuse).
Check or replace D921.
Replace BD900.
YES
YES
YES
NO
NO
F900 normal?
BD900 normal?
Replace TH900.
D921 normal?
YES
YES
YES
NO
NO
TH900 normal?
Is the Vcc
(12 V ~ 24 V) supplied to IC920
Pin4?
Power Line of Main PCB is short.
19
21
Table of Contents
Section 1 General
3
Table of Contents
3
Esd Precautions
4
Micom Hidden Key Mode
5
Update Program
6
Service Information for Eeprom
6
Specifications
7
Section 2 Cabinet & Main Chassis
8
Exploded Views
10
Receiver Bar Section (Nb3530A)
10
Wireless Subwoofer Section (S33A1-D)
11
Packing Accessory Section
12
Section 3 Electrical
14
One Point Repair Guide
15
Electrical Troubleshooting Guide
20
Receiver Bar Troubleshooting
20
Waveforms of Major Check Point
24
Wiring Diagrams
28
Receiver Bar Wiring Diagram
28
Wireless Subwoofer Wiring Diagram
29
Block Diagrams
30
Receiver Bar Block Diagrams
31
Wireless Subwoofer Block Diagram
32
Circuit Diagrams
33
Receiver Bar Circuit Diagrams
34
Circuit Voltage Chart
39
Printed Circuit Board Diagrams
41
Receiver Bar Printed Circuit Board Diagrams
42
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LG S33A1-D Specifications
General
Brand
LG
Model
S33A1-D
Category
Speaker System
Language
English
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