Lamp Cover Error (3X Power/Standby Red Led Flash Pattern); Fan Stopped (4X Power/Standby Red Led Flash Pattern); Lamp Driver Error (5X Power/Standby Red Led Flash Pattern); Low B Error (6X Power/Standby Red Led Flash Pattern) - Sony KDS-R50XBR1 Training Manual

near the lamp. The DE microprocessor regularly queries IC7120 on the
S1-Board over the I2C bus for temperature information. The threshold is
set to approximately 65 degrees Celsius, and is located in the lower left
front corner of the unit on the front of the Lamp housing when looking at
the unit from the rear.
There is also a LM75 mount on the C-board, which monitors internal TV
temperature. The DE microprocessor regularly queries IC6901 on the
C-Board over the I2C bus for temperature information. The threshold is
set to approximately 90 degrees Celsius, and is located on the C-board
atop the Optical Block. The C-board and Optical Block come form parts
as an assembly.
When any one of the areas describe goes above the indicated temperature
threshold the TV will shutdown and a 2X flash pattern on the Standby/
Power LED will occur.

Lamp Cover Error (3X Power/Standby Red LED Flash Pattern)

The DE microprocessor monitors the lamp cover (or Door) for proper
closure. On the back of the lamp cover there is a tab, which depresses
and closes a switch on the T1-Board when the cover is securely closed.
If the cover is not properly closed or if the tab, switch, or wiring is damaged
then the TV will shutdown and a 3X flash pattern on the Standby/Power
LED will occur.
The DE microprocessor also monitors the Lamp plug connection using
the T3-Board, located inside the Lamp housing near the female side of
the plug.
If the plug does not mate up properly or if the plug, switch, or wiring
is damaged then the TV will shutdown and a 3X flash pattern on the
Standby/Power LED will occur.

Fan Stopped (4X Power/Standby Red LED Flash Pattern)

All cooling and exhaust fans in the TV are monitor for rotation. If any
one of the fans stops rotating for any reason such as, an obstacle blocking
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the blades or a defective fan the DE microprocessor will receive an error
signal. The TV will shutdown and a 4X flash pattern on the Standby/
Power LED will occur.

Lamp Driver Error (5X Power/Standby Red LED Flash Pattern)

This protection circuit monitors the output of the Lamp Driver (aka Lamp
Power Supply Block or Lamp Ballast) module for the presents of the High
Voltage Drive (~12KV) for Lamp ignition and normal operating voltage
(~60V) after initial lamp ignition.
NOTE: The lamp ignition High Voltage can vary between 5KV and 26KV,
12KV is the typical ignition voltage level. The actual value of the ignition
voltage depends on the temperature of the lamp at the time of ignition.
This protection circuit also indirectly monitors the 380V from the main
power supply. If the 380V supply is missing the Lamp Driver will not be
able to develop the high voltage, and therefore, the DE microprocessor
will detect a lamp driver failure.
When either the high voltage output fails (Lamp Drive defective) or the
380V supply fails (Main Power Supply defective) the TV will shutdown
and a 5X flash pattern on the Standby/Power LED will occur.

Low B Error (6X Power/Standby Red LED Flash Pattern)

The DE microprocessor directly monitors the DC voltage output of the
D5V regulator IC2103 on the ASU-Board, and indirectly the SUB11V
voltage output from the Main Power Supply. The SUB11V is the input
voltage of the D5V regulator IC2103. Therefore, if either the D5V regulator,
Main Power Supply, or the SUB11V voltage path to the D5V regulator fails
the TV will shutdown and a 6X flash pattern on the Standby/Power LED
will occur.

Audio Error (7X Power/Standby Red LED Flash Pattern)

The protection circuit (IC2605, IC2606, and IC2608) mounted on the K-
Board monitors the audio amplifier outputs (speaker lines) for a shorted
4. Protection Circuits
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