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Lamp didn't strike - InFocus LP640 Projector Multimedia Projector

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If you have replaced the lamp, you may have pushed the part that the lamp plugs into out of place. It may appear to be connected, but it may not be. You will have to remove the top cover so the lamp housing is visible and look to see if the connection is secure. If not you can hold the lamp connection in place and plug the lamp in. You also should check to make sure the actuator on the lamp door is making full contact with the safety switch under the lamp door. You can check this by pushing the safety switch in with something non conductive (the door needs to be off to do this.) and holding the switch in and powering the unit up. If it does power up then that means the lamp door has been distorted by the heat from the lamp and will need to be replaced or rigged to where the actuator pushes the safety in all the way. If neither of these are the problem and if you haven't reset the filter and lamp hours, the I would say your power supply is bad.

Posted on Oct 12, 2010

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Put new bulb in it wont strike, put old bulb back in (worked before0 and it wont strike WTF


Make sure the lamp connector in the projector has not been pushed in as I have seen this happen on a couple of LP540 and LP640 projectors.
If the connector is pushed in the connector on the lamp will not make contact and strike the lamp.

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1 Answer

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i actually own this tv myself... that striking you here will only occur when the lamp does not fire. as far as lamp life i have found that mitsubishi has the longest lasting bulbs from my experience. i would check to make sure the connector on the lamp is seated properly into the other connector in the tv. if you know your lamp is 100% i would look at replacing the lamp ballast. ive had this tv for a few yrs now and love it.

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1 Answer

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Do you hear it trying to strike the lamp, like a spark type noise. If not then perhaps the ballast circuit is faulty, assuming that the power comes on and the leds light up.

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1 Answer

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the ballast might be bad as well.

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it's the ballast or power supply. the lamp gets about 250vdc until it reaches a certain point, then it drops to about 20vdc, but the high strike runs through a different part of the ballast than the maintenance voltage.

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Check for shorted flat pack diode in power supply.

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1 Answer

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Also having this problem."Warming up" then "lamp didn't strike" then "retrying" stuck in a loop. It's at a school where I work and nobody has reported any messages regarding the lamp hours.

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1 Answer

Green light On Off


You should listen for a strike noise at the lamp or ballast area, 1 strike for each cycle. A weak lamp will take more strikes to start, until one day it never starts.

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this can sometimes indicate either an overheating issue, a lamp service life problem, or that the cover to the lamp housing has not been secured properly.

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