Hi if power is not on means definately problem occur in power supply board. In that board 1st check fuse(it may be cape fuse ),thermister, diode and capacitor in multimeter. suppose all are in very good condition 2nd thing to check the transformer secondary side filter capacitor voltage.wheater low voltage come across to that means also cause the projector not on.
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Re: power (maybe internal fuse)
This sounds like either the power supply&Ballast is blown. Or the lamp blew out. Take the lamp out, look at the bulb to see if it is frasted heavily or just broken. If not you might want to send it in for repairs.
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The internal fuse is normally located very near the power plug socket and usually a Buss glass fuse, rated 5 amps? If you get to it, check the metal end for the rating.You have to remove the top cover to get at it...remember, the problem could be the fuse--or the power supply section has failed.--Rick
try to replace all the capacitors on the motherboard. This are the only parts that leak in time. Try otherwise to reset to counter or update the firmware on your machine on the infocus site.
You should get some indication of power even without the globe. This can however be a problem relating to the globe not being inside the projector.
Most projectors use a switch inside so they know when a lamp is installed. Some have several of these and a fuse that is on the lamp unit itself.
Replace the lamp back into the projector and apply power again. If you get lights then you have that much solved at least.
If there are still no power lights at all, then you may have had a power surge that not only killed the globe, but has blown the internal fuse for the power supply as well (or even killed the power supply)
To get access to the power supply you will need to disassemble the whole unit almost. If your not comfortable doing this, then I would advise getting it checked over by your local tech. It could save you hundreds of dollars buying a new lamp when the projector may not be worth repairing.
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If you can, confirm the output of the power source! if you have +/- 0V on all outputs then you may have a defective schottky, verify if all 4 diodes on the
secondary are ok ( you can spot a bad one by the short circuit on the 2
The power supply of the lp640 has a protection derived by the functions of TOP
2XX witch in overload stops. therefore disabling the shorted output.
Verify the state of the fuses also.