LG DP351G Service Manual page 12

LCD PART
...................................................................................................................................................3-2
LCD ELECTRICAL TROUBLESHOOTING GUIDE
BLOCK DIAGRAM
......................................................................................................................................3-3
CIRCUIT DIAGRAM
PRINTED CIRCUIT BOARD DIAGRAM
MAIN PART
...............................................................................................................................................3-11
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
1. DC-DC CONVERTER CIRCUIT ...........................................................................................................3-11
2. MPEG CIRCUIT ...................................................................................................................................3-14
3. RF/SERVO CIRCUIT............................................................................................................................3-15
4. CHARGING CIRCUIT ..........................................................................................................................3-18
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
1. SYSTEM 27MHz CLOCK, RESET & FLASH R/W SIGNAL ................................................................3-19
2. SDRAM CLOCK ...................................................................................................................................3-19
3. DISC TYPE JUDGEMENT WAVEFORM .............................................................................................3-20
4. FOCUS ON WAVEFORM.....................................................................................................................3-22
5. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)..............................................................3-22
6. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) ..................................................3-23
7. MT1389 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF) ..........................................................3-24
8. MT1389 VIDEO OUTPUT WAVEFORM ..............................................................................................3-24
9. AUDIO OUTPUT FROM AUDIO DAC..................................................................................................3-25
WIRING CONNECTION DIAGRAMS
1. WIRING CONNECTION DIAGRAMS-1 ...............................................................................................3-26
2. WIRING CONNECTION DIAGRAMS-2 ...............................................................................................3-27
BLOCK DIAGRAMS
1. OVERALL BLOCK DIAGRAM ..............................................................................................................3-29
2. POWER BLOCK DIAGRAM.................................................................................................................3-31
3. SERVO BLOCK DIAGRAM..................................................................................................................3-33
4. SYSTEM BLOCK DIAGRAM................................................................................................................3-35
5. AV BLOCK DIAGRAM ..........................................................................................................................3-37
CIRCUIT DIAGRAMS
1. MPEG CIRCUIT DIAGRAM .................................................................................................................3-39
2. MEMORY CIRCUIT DIAGRAM ............................................................................................................3-41
3. OPU & MOTOR CIRCUIT DIAGRAM ..................................................................................................3-43
4. AV CIRCUIT DIAGRAM........................................................................................................................3-45
5. CHARGE CIRCUIT DIAGRAM.............................................................................................................3-47
6. LCD I/F CIRCUIT DIAGRAM................................................................................................................3-49
7. KEY MENU CIRCUIT DIAGRAM .........................................................................................................3-51
• CIRCUIT VOLTAGE CHART
PRINTED CIRCUIT BOARD DIAGRAMS
1. MAIN P.C.BOARD ................................................................................................................................3-57
2. KEY MENU P.C.BOARD ......................................................................................................................3-61
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
SECTION 3
ELECTRICAL
CONTENTS
...................................................................................................................................3-5
..............................................................................................3-7
..................................................................................................3-26
.................................................................................................................................3-29
..............................................................................................................................3-39
..............................................................................................................3-53
.........................................................................3-2
.....................................................................3-11
.........................................................................................3-57
3-1
.................................3-19
LGE Internal Use Only