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Portable DVD Player
DP450P
LG DP450P Service Manual
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3-11
MAIN PART
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER (DC-DC CONVERTER CIRCUIT)
A. NO POWER ON BY ADAPTOR
B. NO POWER ON BY BATTERY
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
Is ADAPTOR
out 12V?
Is D606 OK?
Is BATTERY OK?
Replace ADAPTOR
Replace D606
No +12V
Replace U401
Is U202 1.8V OK?
Replace U202
Replace U202
Is Q402 5V OK?
Replace U401
Replace U401
Is U401
3.3V OK?
VCOM signal?
(Vip 4.5)
Is U401
5V OK?
Is U401
5V OK?
No LCD_3.3V
No S3.3V
No A+5V
No M5V
VCC_5V
No 5VA
Replace BATTERY
No power on
by ADAPTOR
No power on
by BATTERY
17
19
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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