Question about NEC LT 240K Multimedia Projector

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NEC LT240K projector - image now "pulses"

I originally bought my NEC lt240K as a combination business presentation/home theater projector, but in recent years it has been almost exclusively home theater. Usage has been light either way - the menu shows only 245 projector hours and 244 lamp hours of use - this is over the projector's lifetime, I have never changed the lamp. Up until this week it has worked great, but now the brightness of the image has started to "pulse" (vary over a curve in and out, as opposed to a "flicker"). Sometimes the pulse is regular (with a cycle of about once per second or two), other times it is irregular, but for all applications it is noticable and distracting/annoying. The pulse is not input-related; the default blue screen pulses even if no input is active.

If this is a lamp problem, I will probably invest in a new lamp and keep the projector because up until now I have been very happy with it. If it is more likely to be a more serious projector problem, I would rather put the bulb money toward a new projector. Can you give me any insight/advice?

Thanks.

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  • don_wood830 May 29, 2010

    That's what I needed to know, thanks.

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The brightness of the image can oscillate from only 2 causes: 
1 - the bulb is dying -  most likely - the only way you can test that is to replace the bulb and see the result.
2 - the power source is dying - this is a much more serious problem. The only way you can test that (apart from looking for defective capacitors) is to check the voltages while the projector displays a still image - the voltages should be the normal value and constant. If they aren't constant you should see a correlation between the brightness of the screen and the value of the voltage on one (or possibly more) power lines.

Posted on May 29, 2010

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Sounds like the projector has two problems, the lamp is starting to malfunction, and/or the LCD function and lamp luminance.

This problem can be fixed. However, this concern should be consulted to an engineer to estimate the cost of parts replacement. The consultation / parts estimation should be for free.

You may also check for the available drivers and that might help as well.

Thank you and good luck!

Posted on May 29, 2010

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Posted on Jan 02, 2017

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