Black Box IC515C Service Manual Page 58
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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12. RA-4 Video Circuit Troubleshooting
TU501
MAIN
TUNER
TU501
SUB
TUNER
COMPOSITE
+S VIDEO
1-5
VIDEO 5
COMPONENT
VIDEO
SELECT
OUT
IC306
3D
COMB
FILTER
CM501
GLASS
COMB
IC515
A/V SWITCH
IC1305
MAIN
CHROMA
DECODER
IC1307
YUV SW.
CCD MIX
IC1008
MAIN
CPU
IC1301
SUB
CHROMA
DECODER
BR
BOARD
DRC
BM
BOARD
MID
IC511
VIDEO
PROCESSOR
IC1302
YUV SW.
PIP OSD
MIX
RGB
BUFF.
IC1004
OSD
PROCESSOR
BD BOARD
PJE OSD
CCD
MAIN Y/COMP.
MAIN
C
MAIN Y
OR
COMPOSITE
SUB
Y
C
SUB C
SUB Y
C
YUV
CCD
YUV
SUB Y
YUV
YUV
YUV
RGB
PIP
CV
RGB
RGB
RGB
YUV
RGB
FIGURE 12-1 - VIDEO PATH BLOCK
12.1TVP14 6/4/02
Troubleshooting a “No Video” Condition
Many situations can cause this condition. The presence of audio is usually a good diagnostic tool, but the set
may be in one of the external input modes so it might not be there for you to hear. What you should do is look for
the initial “must haves” and follow that order to isolate the cause.
The first check is for the presence of high voltage. You should be able to hear it come up in most cases. If it
does, the next concern is that it is staying on. You may be dealing with a HV shutdown. Fortunately, this chassis
will indicate the shutdown by blinking the timer LED in sets of seven. In that case, refer to the earlier chapter
dealing with high voltage shutdown.
The next step is to wait at least 15 seconds and observe if the timer LED begins to blink in sequences of five. You
now know that you are dealing with an AKB error. Go to Chapter 27, which specifically deals with AKB problems
and troubleshoot accordingly.
Your next ally is the OSD feature. Try pressing the channel up or down, the video input select or the menu button
on the remote. If no OSD appears, the video process IC is suspect since OSD has its own path directly into it and
it is highly unlikely that both the OSD and video path have simultaneously failed. Anything is possible so perform
several more checks before you change IC511. If OSD is present, the next test will be even more important.
Using the twin picture mode is an excellent procedure for isolating video problems. When in this mode, the main
and sub video paths are mixed and placed side-by-side. It is the only time the main video source will bypass the
DRC
TM
circuits. What is seen in this mode will provide crucial information. In a set that is operating normally, the
main video source will appear in the right box and the sub video in the left.
- Projection Television 1
- Troubleshooting 1
- Table of Contents 2
- 28. Auto Registration 3
- 29. Model-to-Chassis 3
- Chapter 1 - Introduction 4
- 1. Features 5
- Voltage Regulation Errors 8
- Low B+ 8
- The Main Power Supply 9
- 1TVP14 1448 7/17/02 11
- B+ Regulator Troubleshooting 14
- 4.1TVP14 7/11/02 16
- 5.1BTVP14 1451 7/17/02 18
- Pincushion Correction 19
- Vertical Deflection 20
- 5.2TVP14 1449 6/17/02 21
- T & S Models 23
- 6.1TVP14 6/26/02 24
- 6.2TVP14 5/22/02 26
- FIGURE 6-4 - CRT DRIVE (CG) 27
- 6.5TVP14 6/26/02 28
- 6.6TVP14 5/22/02 30
- 6.7TVP14 5/22/02 31
- FIGURE 8-2 - STANDBY SUPPLY 34
- VCC Switching 35
- 8.5TVP14 6/26/02 36
- Unit Will Not Power Up 37
- Shorted Switching Transistors 38
- Regulator Troubleshooting 38
- FIGURE 8-6 - REGULATION 39
- FIGURE 9-1 - PROTECTION BLOCK 41
- FIGURE 9-2 - DC PROTECTION 42
- Horizontal Deflection 43
- FIGURE 10-2 - H OUT 44
- Horizontal Deflection Loss 46
- FIGURE 10-5 - VDSP 48
- Regulation 52
- 11.3TVP14 7/11/02 53
- High Voltage Protection 54
- FIGURE 11-5 - HV STOP 1 55
- FIGURE 11-6 - HV STOP 2 56
- 12.1TVP14 6/4/02 58
- FIGURE 12-2 - INPUT SWITCHING 59
- FIGURE 12-3 - 3D COMB FILTER 60
- 12.4TVP14 7/11/02 61
- 12.5TVP14 6/7/02 62
- 12.6TVP14 6/11/02 63
- FIGURE 12-7 - MID BLOCK 64
- FIGURE 12-8 - VIDEO PROCESSOR 65
- 6/24/0214.1TVP14 67
- 6/17/0214.2TVP14 68
- Standby Power Supply 71
- Primary Power Supply 71
- 16.2TVP14 1465 6/13/02 72
- Secondary Power Supply 74
- 16.3TVP14 1466 6/13/02 75
- 17.1TVP14 1464 6/24/02 77
- Pincushion Troubleshooting 80
- 18.1TVP14 1468 7/10/02 81
- 18.2TVP14 1462 82
- 19.2TVP14 1469 6/11/02 86
- *SERVICE MODE 88
- 23.1TVP14 1472 6/12/02 96
- 23.2TVP14 1471 7/11/02 98
- 24.1TVP14 7/17/02 100
- 24.2TVP14 1473 6/13/02 101
- General Description 102
- 25.2TVP14 7/17/02 105
- 26.1TVP14 1477 7/17/02 107
- 26.2TVP14 1474 6/13/02 109
- 26.3TVP14 1475 6/13/02 110
- 26.4TVP14 1476 6/13/02 111
- Overview 112
- 27.1TVP14 6/19/02 113
- Flash Focus 118
- Error Codes 121
- 07/18/02 124
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