LG DP372D - Section 3 Electrical

3-1
Copyright © 2008 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. .................................................................3-11
2. SDRAM CLOCK ...................................................................................................................................3-13
3. TRAY OPEN/CLOSE SIGNAL..............................................................................................................3-13
4. SLED CONTROL RELATED SIGNAL..................................................................................................3-14
5. LASER POWER CONTROL RELATED SIGNAL.................................................................................3-15
6. SPINDLE CONTROL WAVEFORM......................................................................................................3-15
7. FOCUS ON WAVEFORM.....................................................................................................................3-16
8. TRACKING CONTROL RELATED SIGNAL(System checking) ...........................................................3-17
9. 1389P VIDEO OUTPUT WAVEFORM .................................................................................................3-18
10. AUDIO OUTPUT FROM 1389P ...........................................................................................................3-18
WIRING CONNECTION DIAGRAMS..................................................................................................3-19
1. WIRING CONNECTION DIAGRAM-1..................................................................................................3-19
2. WIRING CONNECTION DIAGRAM-2..................................................................................................3-20
BLOCK DIAGRAMS.................................................................................................................................3-21
1. OVERALL BLOCK DIAGRAM..............................................................................................................3-21
2. POWER BLOCK DIAGRAM.................................................................................................................3-22
3. SERVO BLOCK DIAGRAM..................................................................................................................3-23
4. SYSTEM BLOCK DIAGRAM................................................................................................................3-24
5. AV BLOCK DIAGRAM ..........................................................................................................................3-25
6. LCD BLOCK DIAGRAM .......................................................................................................................3-26
CIRCUIT DIAGRAMS ..............................................................................................................................3-27
1. MPEG CIRCUIT DIAGRAM .................................................................................................................3-27
2. MEMORY CIRCUIT DIAGRAM............................................................................................................3-29
3. OPU & MOTOR CIRCUIT DIAGRAM ..................................................................................................3-31
4. AV CIRCUIT DIAGRAM........................................................................................................................3-33
5. CHARGE CIRCUIT DIAGRAM.............................................................................................................3-35
6. LCD IF CIRCUIT DIAGRAM.................................................................................................................3-37
7. TUNER CIRCUIT DIAGRAM................................................................................................................3-39
8. MENU KEY CIRCUIT DIAGRAM .........................................................................................................3-41
9. LED DRIVER CIRCUIT DIAGRAM ......................................................................................................3-43
10. FRONT KEY CIRCUIT DIAGRAM........................................................................................................3-45
CIRCUIT VOLTAGE CHART ............................................................................................................3-47
PRINTED CIRCUIT BOARD DIAGRAMS .........................................................................................3-51
1. MAIN P.C.BOARD ................................................................................................................................3-51
2. LCD P.C.BOARD ..................................................................................................................................3-55
3. INVERTER P.C.BOARD .......................................................................................................................3-55
4. KEY P.C.BOARD ..................................................................................................................................3-57