I was given this projector because they said the bulb was too expensive to
replace.
Its a Mitsubishi LVP X70UX.

When turned on the lamp does not come on at all. Not even a strike.
The power LED comes on red 1 second after main switch is turned on.
Then all fans start to turn.
At 3 seconds the lamp LED comes on yellow and the temp led starts flashing
red.
At the same time the fans shut down and the power led flashes red to green
every other second.
The temp led continues to flash once a sec for 4 secs then waits 1 sec and
repeats.
Lamp timer was reset. no change.

I get 393 vdc to lamp powersupply
door switches check good.
Are the temp sensors some kind of thermistor or just a switch?
The fan sensor reads 9 k ohms (measured while disconnected) with 2.9 vdc
across it when on.
Internal sensor 9 k ohms " " "
" 4.6 volts across it.
Lamp sensor 86 k ohms " " "
" 4.7 " " " ".
lamps sensor looks like it is epoxied into a ring lug.
Should these be open or closed ? or are they actual temp readings?

OR is it just really a bad lamp??
Thanks Ropy

"Roy and Rosa" wrote in message
...
I was given this projector because they said the bulb was too expensive to
replace.
Its a Mitsubishi LVP X70UX.

When turned on the lamp does not come on at all. Not even a strike.
The power LED comes on red 1 second after main switch is turned on.
Then all fans start to turn.
At 3 seconds the lamp LED comes on yellow and the temp led starts flashing
red.
At the same time the fans shut down and the power led flashes red to
green
every other second.
The temp led continues to flash once a sec for 4 secs then waits 1 sec and
repeats.
Lamp timer was reset. no change.

I get 393 vdc to lamp powersupply
door switches check good.
Are the temp sensors some kind of thermistor or just a switch?
The fan sensor reads 9 k ohms (measured while disconnected) with 2.9 vdc
across it when on.
Internal sensor 9 k ohms " " "
" 4.6 volts across it.
Lamp sensor 86 k ohms " " "
" 4.7 " " " ".
lamps sensor looks like it is epoxied into a ring lug.
Should these be open or closed ? or are they actual temp readings?

OR is it just really a bad lamp??
Thanks Roy


Lamp and ballast are ok. I was able to determine which wire was the signal
to start the lamp ballast. I jumped across the transister side of the opto
isolator after turning on the main switch and the lamp arced and came on.
Since fans still shut down I turned it off quickly.
When I jump the return signal to tell main board that the lamp is on does
not help. System still shuts down.
I am not getting the start signal to ballast from main board. Appears to
be
a board problem.
Unless someone can help me with the temp sensor voltages, this projector is
junk.
Thanks Roy