LG DKE573XB Service Manual page 11

ELECTRICAL TROUBLESHOOTING GUIDE
1. Power check flow.....................................................................................................................3-2
2. System operation flow ............................................................................................................3-3
3. Test & debug flow ....................................................................................................................3-4
4. KARAOKE Flow (KARAOKE MODEL ONLY) .......................................................................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) .............................................3-14
5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-14
6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) ............................3-15
7. DISC TYPE JUDGEMENT WAVEFORM ................................................................................3-15
8. FOCUS ON WAVEFORM........................................................................................................3-17
9. SPINDLE CONTROL WAVEFORM(NO DISC CONDITION ...................................................3-18
10. TRACKING CONTROL RELATED SIGNAL(System checking).........................................3-19
11. MT1389 AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF).............................................3-20
12. MT1389 VIDEO OUTPUT WAVEFORM................................................................................3-20
13. MT1389 AUDIO OUTPUT TO AUDIO DAC..........................................................................3-21
14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-22
BLOCK DIAGRAMS
1. Overall Block Diagram ..........................................................................................................3-23
2. Power(SMPS) Block Diagram ...............................................................................................3-24
3. SERVO Block Diagram ..........................................................................................................3-25
4. MPEG & MEMORY Block Diagram .......................................................................................3-26
5. VIDEO & AUDIO Block Diagram ...........................................................................................3-27
6. KARAOKE Block Diagram(KARAOKE MODEL ONLY) .......................................................3-28
CIRCUIT DIAGRAMS
1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-29
2. AV/JACK Circuit DIAGRAM...................................................................................................3-31
3. SYSTEM Circuit DIAGRAM ...................................................................................................3-33
4. DRIVER Circuit DIAGRAM.....................................................................................................3-35
5. TIMER Circuit DIAGRAM .......................................................................................................3-37
6. 5.1CH(OPTIONAL PART) & KARAOKE(KARAOKE MODEL ONLY) Circuit DIAGRAM....3-39
7. SCART Circuit DIAGRAM .....................................................................................................3-41
• CIRCUIT VOLTAGE CHART ....................................................................................................3-43
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD ...................................................................................................................3-45
2. KEY P.C.BOARD.....................................................................................................................3-47
3. TIMER P.C.BOARD .................................................................................................................3-48
4. SMPS P.C.BOARD ..................................................................................................................3-49
5. 5.1CH & VGA P.C.BOARD(OPTIONAL PART) ......................................................................3-49
6. KARAOKE P.C.BOARD ..........................................................................................................3-50
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-23
................................................................................................................3-29
............................................................................................3-45
......................................................................3-2
3-1
....................3-11