LG DP372D Service Manual page 12

Manual (36 pages)

Table of Contents

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

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

1. WIRING CONNECTION DIAGRAM-1..................................................................................................3-19

2. WIRING CONNECTION DIAGRAM-2..................................................................................................3-20

BLOCK DIAGRAMS

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

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

PRINTED CIRCUIT BOARD DIAGRAMS

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

Only for training and service purposes

SECTION 3

ELECTRICAL

CONTENTS

..................................................................................................3-19

.................................................................................................................................3-21

..............................................................................................................................3-27

............................................................................................................3-47

...................................................................................3-2

.........................................................................................3-51

3-1

.................................3-11