Lamp Cover Error (3X Power Red Led Flash Pattern); Fan Rotation Error (4X Power Red Led Flash Pattern); Lamp (Hv) Driver Error (5X Power Red Led Flash Pattern); Power Supply (Low B+) Error (6X Power Red Led Flash Pattern) - Sony KDS-50A2000 Training Manual

threshold the TV will shutdown and a 2X flash pattern on the Red Power
LED will occur.

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

The DE microprocessor monitors the Lamp Cover (or Door) for proper
closure. The lamp cover gray sliding bar depresses and closes a switch
on the T-Board when the cover is securely closed.
If the cover is not properly closed or if the door, switch, or wiring is
damaged then the TV will shutdown and a 3X flash pattern on the Red
Power LED will occur.

Fan Rotation Error (4X Power 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
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 Red Power
LED will occur.

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

This protection circuit monitors the output of the Lamp Driver (aka Lamp
Power Supply Block or Lamp Ballast) board for the presence 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
TVP-23
380V supply fails (Main Power Supply defective) the TV will shutdown
and a 5X flash pattern on the Red Power LED will occur.
Power Supply (Low B+) Error (6X Power Red LED Flash
Pattern)
The TV microprocessor directly monitors the DC voltage output of the
D5V regulator IC8008 on the A1-Board, and indirectly the 11V voltage
output from the Main Power Supply on the G-Board. The 11V is the
input voltage of the D5V regulator IC8008. Therefore, if either the D5V
regulator, Main Power Supply, or the 11V voltage path to the D5V regulator
fails the TV will shutdown and a 6X flash pattern on the Red Power LED
will occur.

Audio Error (7X Power Red LED Flash Pattern)

The protection circuit (Q9811 & 9813, Q9812 & Q9814, and Q9815)
mounted on the A1-Board monitor the audio amplifier outputs (speaker
lines) for a shorted condition or for the presents of any DC voltage
level. If either of these conditions is detected the protection circuits will
alert the TV microprocessor of the failure and a 7X flash pattern on the
Red Power LED will occur.
Panel Error or Device Acknowledgement Error (9X Power Red
LED Flash Pattern)
This DE microprocessor monitors the I2C communications between
itself and the C-Board, S1-Board, and S2-Board.
circuit will trigger if the previously mention devices do not send an
acknowledgement (over the I2C bus) during initial TV power-up, or if the
I2C bus communications between these devices is interrupted during
normal operation. In either case, the DE microprocessor detects the
failure, the TV will shutdown, and the Red Power LED flashes a 9X flash
pattern.
5. Protection Circuits
This protection
43