Lamp Door Error (3X) - Sony KDS-50A2000 Training Manual

Yes
If the TV shuts down immediately after Power-ON then one of the
temperature sensors on the S1, S2, or C-Board are most likely defective.
The easiest first step is to replace (substitute a known good) the S1 and
S2 Board. If neither of these boards solve the problem then the Optical
Block (C-board) must be replaced.
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.
Replace
S1 & S2 Boards
(S1) A-1123-582-A
(S2) A-1166-583-A
If the TV has an actual excessive temperature condition then the TV
display "TV Temperature is High" and shutdown after a short period of
time.
Clear unit ventilation areas
and confirm adequate local
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
TVP-23
Does
unit Shut-Down
Immediately after
Power ON
?
No
Replace
Optical Block
A-1203-196-A (50")
A-1203-195-A (55")
A-1203-194-A (60")
room temperature
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 shuts down (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.
If the TV still shuts down (2X) after the previous substitutions then there is
a problem with the DE microprocessor, consequently, the A1-Board must
be replaced.

Lamp Door Error (3X)

Reference Figure 5-5
Two situations can cause the 3X flash pattern.
1) A physically damaged lamp door
2) A defective or damaged lamp door switch on (T-Board)
The first step before replacing any parts is to check for proper positioning
and physical condition of the lamp door and latch.
5. Protection Circuits
Replace
A1-Board
A-1205-146-A (50")
A-1205-145-A (55")
A-1205-144-A (60")
3X Flash
Pattern
(Lamp Door)
50