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LG LAP240 User Manual
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4.1ch Base Speaker
SERVICE MANUAL
MODEL: LAP240
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Website http://biz.lgservice.com
Internal Use Only
MODEL: LAP240
SERVICE MANUAL
2
Table of Contents
Section 1 General
3
Table of Contents
3
Esd Precautions
4
Software Update Method
5
Software Download
6
Connection of the Jig
6
Software Download
9
Specifications
18
Section 2 Cabinet & Main Chassis
20
Disassembly Instructions
21
Cabinet and Main Frame Section (Lap240)
26
Exploded Views
26
Packing Accessory Section
28
Section 3 Electrical
30
One Point Repair Guide
31
Power Problem (20 Va)
31
Power on
32
Audio Output
33
Audio out in Optical Function
34
Audio Output in Bt Function
35
Electrical Troubleshooting Guide
36
Power Supply on Smps Board
36
Power Supply on Main Board
37
Power Supply on Amp Board
38
System Part
39
Audio Output in Bt Function
40
Audio Output in Optical Function
40
System Part - Led
42
System Part - Micom
42
Waveforms of Major Check Point
42
Audio Part - Bt Uart Input
43
Audio Part - Optical Input
43
System Part - Dac Interface
44
System Part - Dsp X-Tal I/O
44
Audio Part - Dac Output
45
Audio Part - Dsp I2S
45
Audio Part - Line Driver Output
46
Audio Part - Volume IC Output
46
Audio Part - Amp IC Output
47
Wiring Diagram
48
Block Diagram
49
Circuit Diagrams
50
Main - Smps Circuit Diagram
50
Main - Power Circuit Diagram
51
Main - Micom Circuit Diagram
52
Main - Audio Dsp Circuit Diagram
53
Main - Dac/ Amp Circuit Diagram
54
Key Circuit Diagram
55
Led Circuit Diagram
55
Circuit Voltage Chart
56
Main P. C. Board
57
Printed Circuit Board Diagrams
57
Key P. C. Board
59
Led P. C. Board
59
4
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LG LAP240 Specifications
General
Brand
LG
Model
LAP240
Category
Speakers
Type
Portable Bluetooth Speaker
Battery Life
Up to 10 hours
Water Resistance
No
Connectivity
Bluetooth
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