Toshiba 42HM66 - 42" Rear Projection TV, Service Manual

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5.3.1.3 Hardware protected (Ballast board).
5.3.2 Protection functions list.
Item Function Description Condition Specification Result Recovery
Normal
Condition
TTL low level
1
Lamp
working
detection
MCU (IC404) detect the DMD
BD. "LAMPLITZ" (pin P25)
voltage level.
Abnormal
condition
TTL high level
MCU re-ignition the lamp for 5
times, if still fail the lamp ignition,
stop the TV power up, show failure
status by LED.
Remote off/on to
re-start up and
re-ignition
Normal
Condition
TTL low level
2
Fan rotate
detection
MCU (IC404) detect the pin1
voltage of CN5001, CN5002
and CN5003.
Abnormal
condition
TTL high level
MCU turn off the lamp, by set the
Rubycon ballast CN02 PIN4 and
PIN5 to high.
1.(MCU pinP26 (LAMPSYNCEN)
-->CN404 pin28-->DMD BD
CN9002
pin28-->Q9004/Q9003(buffer)-->Ba
llast pin4(Lamp Enable set to high);
2.(MCU pinP24 (LAMPPWR)
-->CN404 pin10-->DMD BD
CN9002 pin10-->Q9005-->Ballast
pin5(ECO-LPS set to high))
Remote off/on to
re-start up