Black Box IC515C Service Manual Page 109
- Page / 124
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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106
26. RA-6 Video Circuit Troubleshooting
IC2004
AV SW.
CXA2069Q
8
MAIN
RF
CV IN
MAIN
Y/CV
OUT
44
CV : 1V p-p
TU2
MAIN
TUNER
63
CV : 1V p-p
TU2
SUB
TUNER
SUB
RF
CV IN
RF CH 13 (480i)
75% CB
47
MAIN C
OUT
SUB
CV
OUT
53
49
51
1
7
4
CV IN
Y OUT
C OUT
IC2007
2D COMB
SUB
CXD2073
SUB Y
OUT
SUB C
OUT
Y : 1.6Vp-p (RF)
Y : 1.6Vp-p (V1-4)
56
C : 0.8V p-p (RF)
C : 1.2V p-p (V1-4)
58
[SUB] 480i
(RF, v1-4)
60
CV : 1.5V p-p
Y : 1.5Vp-p
C : 0.6V p-p
TO 3D COMB
IC6
SUB Y
IN
SUB C
IN
CV IN
Y IN
C IN
CV IN
Y IN
C IN
CV IN
Y IN
C IN
CV IN
CV:1V p-p
Y : 0.6V p-p
C : 0.6Vp-p
V1
V2
V3
V4
15
17
19
1
3
5
22
24
26
CV (480i)
75% CB
1.0vp-p
Y/C (480i)
75% CB
Y : 0.82V p-p
C : 0.62Vp-p
Y, P
B
,P
R
V5
Y, P
B
,P
R
V6
TO YCT
MAIN
IC303
COMPONENT
SWITCH
IC306
TO YCT
-SUB
IC301
Y P
B
P
R
(480i)
75%CB
Y: 0.82Vp-p
P
B
: O.53Vp-p
P
R
: 0.53V p-p
Y P
B
P
R
(480P)
75%CB
Y: 0.82Vp-p
P
B
: O.53Vp-p
P
R
: 0.53V p-p
FIGURE 26-2 - VIDEO SWITCHING RA-6 CHASSIS
26.2TVP14 1474 6/13/02
U BOARD
U BOARD
screen or move around in a clock-like stepping motion. Minor or severe loss of picture detail is caused by one or
more of the parallel bit lines being inactive. The more significant the bit, the more detail loss will occur. Power
supply and external noise will “float” since they are not synchronized with the video. Video level problems tend
to occur in the analog processing stages.
Figures 26-2, 26-3 and 26-4 provide detailed blocks with pin locations and video signal levels with color bar input
at 75% white level.
- 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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