LG DV7511E6S, Service Manual

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3-1
SECTION 3
ELECTRICAL
CONTENTS
DVD PART
ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS
.................................. 3-2
1. System Clock X501 (27Mhz) ................................................................................................. 3-2
2. Initializing between MPEG and SDRAM .............................................................................. 3-2
3. Initializing between MPEG and Flash .................................................................................. 3-3
4. Reference Voltage 1............................................................................................................... 3-3
5. Reference Voltage 2............................................................................................................... 3-4
6. Checking the initial step of M/D Ass’y ................................................................................ 3-4
7. Checking the Video Signal ................................................................................................... 3-5
8. Checking the first step of servo (1) ..................................................................................... 3-5
9. Checking the second step of servo (2) ............................................................................... 3-6
10. Checking the output of Audio signal................................................................................. 3-6
11. Checking the reset port....................................................................................................... 3-7
12. Checking the focus & tracking servo ................................................................................ 3-7
13. Checking the track jump..................................................................................................... 3-8
14. The status of CD_LD and DVD_LD in the PLAY MODE ................................................... 3-8
15. The status Focus and spindle motor................................................................................. 3-9
16. DATA STREAM ..................................................................................................................... 3-9
17. Input Clock to IC202 .......................................................................................................... 3-10
18. Tray Open and Close......................................................................................................... 3-10
19. Focus Drive signal(FACT) ................................................................................................. 3-11
20. Signals for Front micom ................................................................................................... 3-11
21. FACT and FE for DVD9 (Dual disc) .................................................................................. 3-12
22. System clock of MPEG IC ................................................................................................. 3-12
BLOCK DIAGRAMS
................................................................................................................ 3-13
1. DVD Overall Block Diagram................................................................................................ 3-13
2. SERVO Block Diagram ........................................................................................................ 3-14
3. MPEG Block Diagram .......................................................................................................... 3-15
4. AUDIO Block Diagram ......................................................................................................... 3-16
CIRCUIT DIAGRAMS
.............................................................................................................. 3-17
1. POWER(SMPS) CIRCUIT DIAGRAM................................................................................... 3-17
2. RF SERVO CIRCUIT DIAGRAM........................................................................................... 3-19
3. SYSTEM CIRCUIT DIAGRAM .............................................................................................. 3-21
4. AUDIO & JACK CIRCUIT DIAGRAM ................................................................................... 3-23
5. TIMER/5.1CH CIRCUIT DIAGRAM....................................................................................... 3-25
• CIRCUIT VOLTAGE CHART .................................................................................................. 3-27
PRINTED CIRCUIT DIAGRAMS
.......................................................................................... 3-31
1. MAIN P.C.BOARD ................................................................................................................. 3-31
2. KEY P.C.BOARD................................................................................................................... 3-33
3. TIMER P.C.BOARD ............................................................................................................... 3-33
4. SCART P.C.BOARD.............................................................................................................. 3-35
4. POWER(SMPS P.C.BOARD ................................................................................................. 3-36