LG GoldStar DVD5185 Service Manual page 14

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS
1. System Clock X501 (13.5Mhz) ................................................................................................3-2
2. Initializing between CPLD and Flash.....................................................................................3-3
3. Initializing between MPEG and SDRAM ................................................................................3-3
4. Initializing between MPEG and Flash ....................................................................................3-4
5. Reference Voltage 1.................................................................................................................3-4
6. Reference Voltage 2.................................................................................................................3-5
7. Checking the initial step of M/D Ass'y3-5
8. Checking the Video Signal......................................................................................................3-6
9. Checking the first step of servo (1)3-6
10. Checking the second step of servo (2) ...............................................................................3-7
11. Checking the output of Audio signal ...................................................................................3-7
12. Checking the reset port ........................................................................................................3-8
13. Checking the focus & tracking servo ..................................................................................3-8
14. Checking the track jump.......................................................................................................3-9
15. The status of CD_LD and DVD_LD when to play ...............................................................3-9
16. The status Focus and spindle motor.................................................................................3-10
17. DATA STREAM .....................................................................................................................3-10
18. Input Clock to IC201 ............................................................................................................3-11
19. Tray Open and Close ...........................................................................................................3-11
20. Focus Drive signal(FDO).....................................................................................................3-12
21. Signals for Front micom .....................................................................................................3-12
22. FDO and FE for DVD9 (Dual disc) ......................................................................................3-13
23. System clock of MPEG IC ...................................................................................................3-13
BLOCK DIAGRAMS
1. Overall Block Diagram ..........................................................................................................3-14
2. Power (SMPS) Block Diagram..............................................................................................3-15
3. Audio Block Diagram ............................................................................................................3-16
4. MPEG & MEMORY Block Diagram .......................................................................................3-17
5. Servo Interface and Block Diagram.....................................................................................3-18
6. KARAOKE Block Diagram (KARAOKE MODEL ONLY)......................................................3-19
CIRCUIT DIAGRAMS
1. Power (SMPS) Circuit Diagram ............................................................................................3-20
2. RF & SERVO Circuit Diagram...............................................................................................3-22
3. SYSTEM Circuit Diagram ......................................................................................................3-24
4. AUDIO & JACK Circuit Diagram ...........................................................................................3-26
5. Timer/5.1CH Circuit Diagram ................................................................................................3-28
• CIRCUIT VOLTAGE CHART ....................................................................................................3-30
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD ...................................................................................................................3-34
2. KEY P.C.BOARD.....................................................................................................................3-36
3. TIMER P.C.BOARD .................................................................................................................3-36
4. SCART & 5.1CH P.C.BOARD.................................................................................................3-38
SECTION 3
ELECTRICAL
CONTENTS
..................................................................................................................3-14
................................................................................................................3-20
............................................................................................3-34
3-1
....................................3-2