LG MDT505 - SECTION 3 ELECTRICAL

SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE .................................................................................... 3-2
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ................................ 3-16
WIRING DIAGRAM ................................................................................................................................... 3-29
BLOCK DIAGRAM .................................................................................................................................... 3-31
CIRCUIT DIAGRAMS ............................................................................................................................... 3-33
1. SMPS - POWER CIRCUIT DIAGRAM ................................................................................................. 3-33
2. MAIN - MICOM CIRCUIT DIAGRAM .................................................................................................... 3-35
3. MAIN - PWM CIRCUIT DIAGRAM ....................................................................................................... 3-37
4. MAIN - AMP CIRCUIT DIAGRAM ........................................................................................................ 3-39
5. MAIN - DECK CIRCUIT DIAGRAM ...................................................................................................... 3-41
6. MAIN - MPEG CIRCUIT DIAGRAM ..................................................................................................... 3-43
7. MAIN - SERVO CIRCUIT DIAGRAM ................................................................................................... 3-45
8. MAIN - I/O CIRCUIT DIAGRAM ........................................................................................................... 3-47
9. VFD CIRCUIT DIAGRAM ..................................................................................................................... 3-49
10. MIC & USB CIRCUIT DIAGRAM .......................................................................................................... 3-51
11. VOLUME CIRCUIT DIAGRAM ............................................................................................................. 3-53
12. IPOD CIRCUIT DIAGRAM (OPTIONAL PART) ................................................................................... 3-55
13. KARAOKE CIRCUIT DIAGRAM (OPTIONAL PART) ........................................................................... 3-57
CIRCUIT VOLTAGE CHART ................................................................................................................. 3-59
PRINTED CIRCUIT BOARD DIAGRAMS ......................................................................................... 3-61
1. MAIN P.C.BOARD ................................................................................................................................ 3-61
2. SMPS P.C.BOARD ............................................................................................................................... 3-65
3. FRONT(VFD / USB & MIC / VOLUME) P.C.BOARD ........................................................................... 3-67
4. IPOD P.C.BOARD (OPTIONAL PART) ................................................................................................ 3-69
5. KARAOKE P.C.BOARD (OPTIONAL PART) ....................................................................................... 3-69
3-1