LG DV6812E4 Service Manual page 13

ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) Circuit...............................................................................................................3-2
2. µ-com Circuit............................................................................................................................3-3
3. MPEG Circuit............................................................................................................................3-6
4. Front Circuit(Digitron & Key) ................................................................................................3-7
5. RF/Servo Circuit ......................................................................................................................3-8
6. KARAOKE Circuit (KARAOKE MODEL ONLY)....................................................................3-12
BLOCK DIAGRAMS
1. Overall Block Diagram ..........................................................................................................3-13
2. Power (SMPS) Block Diagram..............................................................................................3-14
3. RF/CD DSP/DVD DSP/DVD servo Block Diagram ..............................................................3-15
4. Audio Block Diagram ............................................................................................................3-16
5. MPEG & MEMORY Block Diagram .......................................................................................3-17
6. KARAOKE Block Diagram (KARAOKE MODEL ONLY)......................................................3-18
CIRCUIT DIAGRAMS
1. Power (SMPS) Circuit Diagram ............................................................................................3-19
2. DVD DSP Circuit Diagram .....................................................................................................3-21
3. Drive & RF Circuit Diagram ..................................................................................................3-23
4. MPEG Circuit Diagram ..........................................................................................................3-25
• WAVEFORMS ...........................................................................................................................3-27
5. Audio Circuit Diagram ...........................................................................................................3-29
6. MEMORY Circuit Diagram .....................................................................................................3-31
7. FRONT & MIC Circuit Diagram .............................................................................................3-33
8. A/V JACK Circuit Diagram ....................................................................................................3-35
• CIRCUIT VOLTAGE CHART ....................................................................................................3-37
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD ...................................................................................................................3-41
2. POWER,A/V,FRONT P.C.BOARD ..........................................................................................3-43
3. KEY P.C.BOARD.....................................................................................................................3-45
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-13
................................................................................................................3-19
............................................................................................3-41
......................................................................3-2
3-1