Black Box IC515C Service Manual Page 67
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- Table of contents
- TROUBLESHOOTING
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14. RA-4A Video Circuit Troubleshooting
Chapter 14 - RA-4A Video Circuit Troubleshooting
IC515
A/V
SWITCH
TU501
MAIN
TUNER
TU502
SUB
TUNER
COMPOSITE
AND S VIDEO
1 - 4
CM501
GLASS
COMB
SUB
Y
C
IC1301
SUB
CHROMA
DECODER
IC1401
SUB V
CHIP
SUB C
YUV
IC1302
YUV SW
PIP OSD
MIX
SUB Y
SUB Y
MAIN Y/COMP
MAIN
C
IC1305
MAIN
CHROMA
DECODER
IC1307
YUV SW
CCD MIX
C
BR
BOARD
YUV
IC1008
MAIN
CPU
IC2402
3D COMB
FILTER
MAIN Y
MAIN Y
YUV
BM
BOARD
CCD + V CHIP OSD
Y FOR V CHIP
RGB
BUFFER
IC511
VIDEO
PROCESSOR
IC1004
OSD
PROCESSOR
VIDEO 5
DTV
INPUT
DTV YUV
RGB
MAIN
YUV
PIP
YUV
CV
FOR
PIP
OSD
YUV
RGB
RGB
TO
TUBES
VIDEO 4
COMPONENT
FIGURE 14-1 - RA-4A VIDEO PATH BLOCK
BA BOARD
IC1403
MAIN YUV
SELECT
RGB
PJED
OSD
6/24/0214.1TVP14
As illustrated in Figure 14-1, many of the same processes are performed to the incoming video signals. All
composite and S video sources are routed through the 3D comb filter and chroma decoder for the main video
signal. The sub video will pass through a glass comb filter and sub decoder. This will provide the necessary
sources for P & P processing for the multi image driver. The main video source will continue on to the BR board
where the DRC circuitry will perform line doubling for 960i display.
Video 4 input allows non-HD component video to bypass the decoder and comb filter for line doubling by the
DRC. Although the video 5 input illustrated in Figure 14-1 appears to head directly to the video processor IC511,
non-1080i signals are still sent through the DRC
TM
by switching the signal out of IC511 to the DRC
TM
and back by
detecting the sync frequency of the source. This is illustrated in Figure 14-2. This allows for direct processing of
1080i sources by the video processor. If the main CPU IC1008 detects a 480i signal source from video 5, it will
instruct IC511 to route the video to IC1403. The CPU will toggle the signal to IC1307. It will then be sent to the
BR board for line doubling.
The main CPU IC1008 will generate closed caption, XDS and V chip graphics for display to the main video.
Parental control of the sub video path will be provided by IC1401.
- 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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