3-1
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
SECTION 3
ELECTRICAL
CONTENTS
LCD PART
...................................................................................................................................................3-2
LCD ADJUSTMENTS
................................................................................................................................3-2
LCD ELECTRICAL TROUBLESHOOTING GUIDE
.........................................................................3-3
BLOCK DIAGRAM
......................................................................................................................................3-5
CIRCUIT DIAGRAM
...................................................................................................................................3-7
CIRCUIT VOLTAGE CHART
...................................................................................................................3-9
PRINTED CIRCUIT BOARD DIAGRAM
............................................................................................3-10
MAIN PART
...............................................................................................................................................3-11
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
.....................................................................3-11
1. POWER (DC-DC CONVERTER) CIRCUIT..........................................................................................3-11
2. MPEG CIRCUIT ...................................................................................................................................3-14
3. SERVO CIRCUIT .................................................................................................................................3-15
4. CHARGING CIRCUIT ..........................................................................................................................3-17
WIRING CONNECTION DIAGRAMS
..................................................................................................3-18
1. WIRING CONNECTION DIAGRAMS-1 ...............................................................................................3-18
2. WIRING CONNECTION DIAGRAMS-2 ...............................................................................................3-19
3. WIRING CONNECTION DIAGRAMS-3 ...............................................................................................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
CIRCUIT DIAGRAMS
..............................................................................................................................3-27
1. POWER CIRCUIT DIAGRAM ..............................................................................................................3-27
2. AV CIRCUIT DIAGRAM........................................................................................................................3-29
3. CONNECTION CIRCUIT DIAGRAM ....................................................................................................3-31
4. DC-DC CIRCUIT DIAGRAM ................................................................................................................3-33
5. MPEG CIRCUIT DIAGRAM .................................................................................................................3-35
6. SDRAM, FLASH & EEPROM CIRCUIT DIAGRAM .............................................................................3-37
CIRCUIT VOLTAGE CHART
.................................................................................................................3-39
PRINTED CIRCUIT BOARD DIAGRAMS
.........................................................................................3-43
1. MAIN P.C.BOARD ................................................................................................................................3-43
2. KEY P.C.BOARD ..................................................................................................................................3-47
3. USB P.C.BOARD..................................................................................................................................3-48
