Table Of Contents - LG DK7711PM Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE
1. Power check flow.....................................................................................................................3-2
2. System operation flow ............................................................................................................3-3
3. Test & debug flow ....................................................................................................................3-4
4. Karaoke flow ..........................................................................................................................3-10
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL........................................................3-11
2. SDRAM CLOCK ......................................................................................................................3-13
3. TRAY OPEN/CLOSE SIGNAL ................................................................................................3-13
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) ............................................3-15
5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-15
6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) ............................3-16
7. DISC TYPE JUDGEMENT WAVEFORM ................................................................................3-16
8. FOCUS ON WAVEFORM........................................................................................................3-18
9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION).................................................3-19
10. TRACKING CONTROL RELATED SIGNAL(System checking).........................................3-20
11. RF WAVEFORM ....................................................................................................................3-21
12. MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF)..........................................3-21
13. MT1379 VIDEO OUTPUT WAVEFORM................................................................................3-22
14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-23
BLOCK DIAGRAMS
1. Overall Block Diagram ..........................................................................................................3-25
2. Power(SMPS) Block Diagram ...............................................................................................3-26
3. SERVO Block Diagram ..........................................................................................................3-27
4. MPEG & MEMORY Block Diagram .......................................................................................3-28
5. VIDEO & AUDIO Block Diagram ...........................................................................................3-29
6. Karaoke Block Diagram ........................................................................................................3-30
CIRCUIT DIAGRAMS
1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-31
2. SYSTEM Circuit DIAGRAM ...................................................................................................3-33
3. RF & SERVO Circuit DIAGRAM ............................................................................................3-35
4. TIMER, 5.1CH, SCART, KARAOKE Circuit DIAGRAM ........................................................3-37
5. AV/JACK Circuit DIAGRAM...................................................................................................3-39
• CIRCUIT VOLTAGE CHART ....................................................................................................3-41
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD ...................................................................................................................3-45
2. KEY P.C.BOARD.....................................................................................................................3-47
3. TIMER P.C.BOARD .................................................................................................................3-47
4. SCART & 5.1CH P.C.BOARD(OPTIONAL PART) .................................................................3-49
5. POWER P.C.BOARD...............................................................................................................3-49
6 KARAOKE P.C.BOARD (KARAOKE MODEL ONLY) ............................................................3-50
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-25
................................................................................................................3-31
............................................................................................3-45
......................................................................3-2
3-1
....................3-11