Black Box IC515C Service Manual Page 54
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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51
11. RA-4/4A High Voltage Circuit Troubleshooting
D BOARD
3
2
1
7
6
5
6
5
7
R8027
+12V
P
H
DRIVE R8021
R8010
R8031
C8019
R8028
Q8009
D8015
C8029
R8027
Q8010
R8044
R8059
TO
Q8008
FROM
Q8024/C
AND IC8007/1
HV REGULATION
CONTROL
R8060
R8067
R8071
C8033
C8045
IC8002
R8082
+12V
R8070
Q8016
N
R8075
Q8015
P
R8084
R8083
Q8018
N
R8074
IC8002
R8077
D8017
R8015
+12V
Q8022
R8085
N
R8095
R8113
R8108
D8023
R8096
R8114
C8066
IC8008
-12V
C8064
11.4TVP14 5/31/02
FIGURE 11-4 - HV REGULATION PWM
High Voltage Protection
The HV monitoring section utilizes two separate circuits to provide redundant protection.
HV Stop 1: Figure 11-5 contains the paths for the first set of protection components. HV level is monitored from
the HV block by pin 3 of IC8008. This is compared to a reference of 9.3VDC at pin 2. If the high voltage rises
above acceptable levels (34KV), pin 3 will exceed the reference. Pin 1 will go high. The H pulse driving the HV
circuit will be grounded by Q8019 and the high signal will sent to OSD CPU IC1009 to flash the timer LED in
sequences of seven.
Flyback transformer current is monitored by applying the ABL voltage to Q8027. Under normal conditions, ABL
is a positive voltage between 2VDC and 6VDC. If the current rises to an unacceptable level, the ABL voltage will
go lower. Once it drops below .6V, Q8027 will turn off, sending a high to pin 3 of IC8010. The H pulse will be cut
off and IC1009 will respond the same way as the over-voltage condition described above.
- 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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