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

Page: 41 / 64

41
Normal
Condition
<=73 degree C
3
DMD
board
thermal
sensor
MCU (IC404) read the DMD
board IC9007 temperature via
I2C bus.
Abnormal
condition
>73 degree C
MCU power off the main power
supply.(MCU
pinT26(POWERON)-->CN201
pin13-->Power Board CN202
pin1-->Q2005(buffer)-->Q2004/IC2
004(photo
coupler)-->Q1006/Q1005(VCC
control for Power ICs
IC1001/IC1002/IC1005))
Remote off/on to
re-start up
Normal
Condition
<=50 degree C
4
Key board
thermal
sensor
MCU (IC404) read the Key
board IC901 temperature via
I2C bus.
Abnormal
condition
>50 degree C
MCU power off the main power
supply.
Remote off/on to
re-start up
Normal
Condition
Door close,
micro switch is
on
5
Micro
switch for
lamp door
open
detection
IC2004 connect to micro switch
and supply the VCC to power
IC, if micro switch is open the
VCC of power IC is off thus
the main power supply cans not
work.
Abnormal
condition
Door open,
micro switch is
off.
Power IC no VCC, Power supply
shutdown immediately.(Micro
SW.-->IC2004(photo
coupler)-->Q1006/Q1005(VCC
control for Power ICs
IC1001/IC1002/IC1005)
Remote off/on to
re-start up
Power
supply AC
line fuse
F1001 serial with AC input
line, if AC input current over
fuse rating (5A 250V), the fuse
will open immediately.
Normal
Condition
AC input current
<5A
6
Abnormal
condition
AC input current
>5A
Fuse open, no power.
AC off-->replace
FUSE-->AC
on-->remote on