TVP-21
74
4. Protection Circuits
Clear unit ventilation areas
and and confirm adequate
local room temperature
Check the following items:
•
The TV should not be located too close any heating elements.
•
The TV should be at least 4 inches
from all walls and enclosures
to ensure adequate ventilation.
•
Check the vented areas on the
lower rear back cover
and the
two rear exhaust fan’s
are clear of all dust and debris.
If all ventilation areas and fans are clear and the TV still shutsdown (2X)
then the next step is to determine if one of the LM75 temperature detection
IC’s on the S1, S2, or C boards have failed. It is a process of elimination
to determine which LM75 has failure.
As the flowchart illustrate start with the least expensive boards and work
your way up.
Substitute new or known good boards in the following order.
Replace
S1 & S2 Boards
(S1) A-1123-098-A
(S2) A-1123-099-A
Replace
Optical Block
50" A-1148-155-A
60" A-1127-174-A
1) S1-Board
2) S2-Board
NOTE: The S2-Board is mounted in difficult-to-get-to spot. Therefore,
the best way to substitute for the board, with very little disassembly,
is to have a extra wire harness (between S-Board and Main Wire
Harness) to connect the substitute board at the interconnect jack.
3) Optical Block (C-Board)
If the TV still shuts down (2X) after the previous substitutions then there
is a problem with the DE microprocessor, consequently, the ASU/DSU
assembly must be replaced.
Replace
ASU/DSU Assembly
50" A-1152-715-A
60" A-1152-714-A
Lamp Cover/Plug Error (3X)
3X Flash
Pattern
(Lamp Cover & Plug)
Two situations can cause the 3X flash pattern.
1) A problem with the
lamp door
positioning and closing of the door
detector switch
(T1-Board)
2) A problem with the positioning of the lamp and
lamp power plug
and the closing of the power plug detector switch
(T3-Board)
The first step befire replacing any parts is to check for proper positioning
of the lamp door and power plug. Furthermore, check for damage to the
following items.
Check
T1 & T3 Boards
Lamp-Door
Switch & Lamp
Connector
Switch
Check
Lamp
&
Lamp Door
is
securely seated
& undamaged
Summary of Contents for KDS-R60XBR1 - 60" Rear Projection TV
Page 1: ...Models KDS R50XBR1 KDS R60XBR1 Diagnostics and Troubleshooting Course TVP 21 Training Manual ...
Page 49: ...TVP 21 46 Disassembly Procedures Wire Routing Diagrams Wire Routing Diagrams ...
Page 50: ...TVP 21 47 Disassembly Procedures Wire Routing Diagrams cont ...
Page 51: ...TVP 21 48 Disassembly Procedures Wire Routing Diagrams cont ...
Page 52: ...TVP 21 49 Disassembly Procedures Wire Routing Diagrams cont ...
Page 53: ...TVP 21 50 Disassembly Procedures Wire Routing Diagrams cont ...
Page 58: ...TVP 21 55 Chapter 2 Initial Contact Analysis ...
Page 72: ...TVP 21 69 4 Protection Circuits Troubleshooting Flowcharts Flowchart C 1 Figure 4 2 ...
Page 73: ...TVP 21 70 4 Protection Circuits Flowchart C 2 Figure 4 3 ...
Page 74: ...TVP 21 71 4 Protection Circuits Flowchart C 3 Figure 4 4 ...
Page 75: ...TVP 21 72 4 Protection Circuits Flowchart C 4 Figure 4 5 ...
Page 88: ...TVP 21 85 5 Video Processing System Video Distortion Flowchart E Figure 5 3 ...
Page 89: ...TVP 21 86 5 Video Processing System Optical Block Flowchart F Figure 5 4 ...
Page 98: ...TVP 21 95 6 Audio Processing System Troubleshooting Flowchart ...
Page 102: ...TVP 21 99 Appendix 2005 SXRD Service Mode Options ...