LG DP471B User Manual

3-1
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE ...................................................................................3-2
1. POWER CHECK FLOW ........................................................................................................................3-2
2. SYSTEM OPERATION FLOW ...............................................................................................................3-3
3. SYSTEM TEST FLOW ...........................................................................................................................3-4
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ................................3-11
1. SYSTEM 27MHZ CLOCK, RESET, FLASH SCK SIGNAL. ..................................................................3-9
2. SDRAM CLOCK ...................................................................................................................................3-11
3. TRAY OPEN/CLOSE SIGNAL .............................................................................................................3-11
4. SLED CONTROL RELATED SIGNAL .................................................................................................3-12
5. LASER POWER CONTROL RELATED SIGNAL ................................................................................3-13
6. SPINDLE CONTROL WAVEFORM .....................................................................................................3-13
7. FOCUS ON WAVEFORM ....................................................................................................................3-14
8. TRACKING CONTROL RELATED SIGNAL(SYSTEM CHECKING) ...................................................3-15
9. VIDEO OUTPUT WAVEFORM ............................................................................................................3-16
10. AUDIO OUTPUT ..................................................................................................................................3-16
WIRING CONNECTION DIAGRAM ....................................................................................................3-17
BLOCK DIAGRAMS ................................................................................................................................3-18
1. OVERALL BLOCK DIAGRAM .............................................................................................................3-18
2. SYSTEM BLOCK DIAGRAM ...............................................................................................................3-19
3. DC BLOCK DIAGRAM .........................................................................................................................3-20
CIRCUIT DIAGRAMS ..............................................................................................................................3-27
1. LCD I/F CIRCUIT DIAGRAM ...............................................................................................................3-21
2. OPU CIRCUIT DIAGRAM ....................................................................................................................3-23
3. HP/SPK AMP CIRCUIT DIAGRAM ......................................................................................................3-25
4. AUDIO I/F CIRCUIT DIAGRAM ...........................................................................................................3-27
5. MOTOR DRIVE CIRCUIT DIAGRAM ..................................................................................................3-29
6. MEMORY CIRCUIT DIAGRAM............................................................................................................3-31
7. MPEG CIRCUIT DIAGRAM .................................................................................................................3-33
8. VIDEO CONTROLER CIRCUIT DIAGRAM .........................................................................................3-35
9. AV I/F CIRCUIT DIAGRAM ..................................................................................................................3-37
10. USB I/F CIRCUIT DIAGRAM ...............................................................................................................3-39
11. LCD POWER CIRCUIT DIAGRAM ......................................................................................................3-41
12. MPEG POWER CIRCUIT DIAGRAM ..................................................................................................3-43
13. INPUT POWER CIRCUIT DIAGRAM ..................................................................................................3-45
14. B/L POWER CIRCUIT DIAGRAM ........................................................................................................3-47
15. CHARGER POWER CIRCUIT DIAGRAM ...........................................................................................3-49
16. SWITCH & VIDEO BUFFER CIRCUIT DIAGRAM ..............................................................................3-51
CIRCUIT VOLTAGE CHART ...........................................................................................................3-53
PRINTED CIRCUIT BOARD DIAGRAMS .........................................................................................3-57
1. MAIN P.C. BOARD ..............................................................................................................................3-57
2. LCD P.C. BOARD ................................................................................................................................3-57

LG DP471B Specifications

General

Brand	LG
Model	DP471B
Category	Portable DVD Player
Language	English