LG DR165 Service Manual page 16

VDR PART
ELECTRICAL TROUBLESHOOTING GUIDE...................................................................................3-2
1. POWER SUPPLY ON SMPS BOARD ........................................................................................3-2
2. POWER SUPPLY ON I/O BOARD..............................................................................................3-4
3. SYSTEM CIRCUIT PART..........................................................................................................3-11
4. DISC NOT RECOGNIZED ........................................................................................................3-11
5. WHEN PLAYING DISC, NO AUDIO OUTPUT..........................................................................3-12
6. NO OPTICAL / DIGITAL OUTPUT ............................................................................................3-13
7. NO TUNER AUDIO OUTPUT ...................................................................................................3-14
8. NO EXTERNAL AUDIO INPUT.................................................................................................3-15
9. NO RGB / COMPONENT VIDEO SIGNAL WHEN PLAY DISC ...............................................3-16
10. NO COMPOSITE / S-VIDEO SIGNAL WHEN PLAY DISC ....................................................3-17
11. NO TV, EXTERNAL INPUT VIDEO SIGNAL...........................................................................3-18
12. NO DV(IEEE 1394) INPUT (VIDEO/AUDIO) SIGNAL ............................................................3-19
BLOCK DIAGRAMS ........................................................................................................................3-20
1. SMPS BLOCK DIAGRAM .........................................................................................................3-20
2. MAIN POWER BLOCK DIAGRAM ...........................................................................................3-22
3. VIDEO IN BLOCK DIAGRAM ...................................................................................................3-24
4. VIDEO OUT BLOCK DIAGRAM ...............................................................................................3-26
5. AUDIO IN BLOCK DIAGRAM ...................................................................................................3-28
6. AUDIO OUT BLOCK DIAGRAM ...............................................................................................3-30
7. SYSTEM MAIN BLOCK DIAGRAM ..........................................................................................3-32
8. I/O µ-COM BLOCK DIAGRAM................................................................................................. 3-34
9. SCART BLOCK DIAGRAM(SCART MODEL ONLY) ................................................................3-36
CIRCUIT DIAGRAMS ......................................................................................................................3-38
1. SMPS CIRCUIT DIAGRAM.......................................................................................................3-38
2. MAIN POWER CIRCUIT DIAGRAM .........................................................................................3-40
3. MPEG CIRCUIT DIAGRAM ......................................................................................................3-42
4. A.LATCH/FLASH/DDR CIRCUIT DIAGRAM.............................................................................3-44
5. LOADER/DV CIRCUIT DIAGRAM ............................................................................................3-46
6. I/O µ-COM CIRCUIT DIAGRAM ...............................................................................................3-48
7. TUNER/MPX/ADC/DAC/JACK CIRCUIT DIAGRAM ................................................................3-50
8. DECODER CIRCUIT DIAGRAM ...............................................................................................3-52
9. TIMER CIRCUIT DIAGRAM ( 6, 7 TOOL ONLY ).....................................................................3-54
10. KEY CIRCUIT DIAGRAM ( 6, 7 TOOL ONLY ).......................................................................3-56
• WAVEFORMS .............................................................................................................................3-58
• CIRCUIT VOLTAGE CHART.......................................................................................................3-60
PRINTED CIRCUIT DIAGRAMS......................................................................................................3-64
1. MAIN P.C.BOARD(TOP SIDE) .................................................................................................3-64
2. MAIN P.C.BOARD(BOTTOM SIDE)..........................................................................................3-66
3. I/O P.C.BOARD .........................................................................................................................3-68
4. JUCTION P.C.BOARD ..............................................................................................................3-68
5. KEY P.C.BOARD.......................................................................................................................3-70
6. TIMER P.C.BOARD...................................................................................................................3-70
7. POWER P.C.BOARD ................................................................................................................3-71
SECTION 3
ELECTRICAL
CONTENTS
3-1