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Portable DVD Player
DP450P
LG DP450P Service Manual
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3-12
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
F. DISC ERROR
Disc error
Check Disc
Refer to SERVO part
Replace B/D
YES
YES
YES
C. AUDIO OUT ABNORMAL
Audio out abnormal
Check Audio jack & mode
Check A+5V
Check signals from MPEG
Replace IC(U502)
YES
YES
YES
YES
E. PICTURE ABNORMAL
Picture abnormal
Check the disc.
Refer to SERVO part
Check DCLK signal of MPEG part
Check MPEG (IC U201)
Replace B/D
YES
YES
YES
YES
YES
D. VIDEO OUT ABNORMAL
Video out abnormal
Check Video jack & mode
Check A+5V
Check signals from MPEG
Check IC(U502)
YES
YES
YES
YES
18
20
Table of Contents
Section 1 Summary
3
Default Chapter
3
Table of Contents
3
Product Safety Servicing Guidelines for Video Products
4
Servicing Precautions
5
General Servicing Precautions
5
Insulation Checking Prodedure
5
Electrostatically Sensitive (Es) Devices
5
Specifications
6
Liquid Crystal Display
6
Exploded Views
8
Exploded Views
9
Cabinet and Main Frame Section
9
Packing Accessory Section
10
Section 3 Electrical
12
Lcd Part
13
Lcd Electrical Troubleshooting Guide
13
Block Diagram
14
Circuit Diagram
15
Printed Circuit Board Diagram
16
Main Part
18
Main Electrical Troubleshooting Guide
18
Power (DC-DC Converter Circuit)
18
Mpeg Circuit
21
Rf/Servo Circuit
22
Charging Circuit
25
Details and Waveforms on System Test and Debugging
26
SYSTEM 27Mhz CLOCK
26
Sdram Clock
26
Mt1389 Video Output Waveform
27
Audio Output from Audio Dac
27
Block Diagrams
28
Overall Block Diagram
28
Power Block Diagram
29
Servo Block Diagram
30
System Block Diagram
31
A/V Block Diagram
32
Circuit Diagrams
34
Mpeg Circuit Diagram
34
Memory Circuit Diagram
35
Opu & Motor Circuit Diagram
36
Av Circuit Diagram
37
Charge Circuit Diagram
38
Lcd I/F Circuit Diagram
39
Key Circuit Diagram
40
Circuit Voltage Chart
41
Printed Circuit Board Diagrams
43
Main P.C.board
43
Key P.C.board
45
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LG DP450P Specifications
General
Brand
LG
Model
DP450P
Category
Portable DVD Player
Language
English
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