LG LGDVB418 Manual page 9

FEATURES FOR MEMORY CARD READ
ELECTRICAL TROUBLESHOOTING GUIDE
1. Power check flow.....................................................................................................................3-3
2. System operation flow ............................................................................................................3-4
3. Test & debug flow ....................................................................................................................3-5
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
CIRCUIT DIAGRAMS
1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-28
2. AV/JACK Circuit DIAGRAM...................................................................................................3-30
3. SYSTEM Circuit DIAGRAM ...................................................................................................3-32
4. DRIVER Circuit DIAGRAM.....................................................................................................3-33
5. TIMER Circuit DIAGRAM .......................................................................................................3-36
6. 5.1CH, SCART Circuit DIAGRAM .........................................................................................3-38
• CIRCUIT VOLTAGE CHART ....................................................................................................3-40
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD ...................................................................................................................3-42
2. KEY P.C.BOARD.....................................................................................................................3-44
3. TIMER P.C.BOARD .................................................................................................................3-45
4. SCART & 5.1CH P.C.BOARD(OPTIONAL PART) .................................................................3-46
5. SMPS P.C.BOARD ..................................................................................................................3-47
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-23
................................................................................................................3-28
............................................................................................3-42
............................................................................3-2
......................................................................3-3
3-1
....................3-11