Compaq MP2800 Lamp powers down after a few seconds (by 5 users)
The unit powers up fine and displays a good crisp image, but shuts down within 45 seconds even though both fans are running. I noticed that the Lamp fan came on just as the Lamp began to heat up and stayed on even after the Lamp shut off.
Wayne
4 Other Users Have The Same Problem
Comment by gaz-man, posted on Jul 12, 2008
Exactly the same thing hapening to my mp2800 as wayne's. I have only loged 590 hours on the lamp so it should not be that causing the shut down. Kept it very clean over the years so it should not be due to dust or muisture. tryed runing it without the bolb in and it still shut down so ??????
Comment by fabbraun, posted on May 31, 2008
I'm having a similar problem:
Device powers up and i get a good image.
Device fan starts immediately.
Lamp fan starts after about 15 seconds.
After about 1 minute the device powers off (device fan stops, but lamp fan keeps on blowing for some seconds).
Something strange: In standby mode the device produces a quiet clicking-noise.
Did someone of you encounter this problem too?
As a future electrical engineer I already did some measurements (oscilloscope, voltage-meter, ...).
It seems that Ballast is having a problem. It's PFC (Power Factor Controller) which converts the rectified 230Volts (Swiss voltage :-)) to 400VDC has a huge ripple voltage (about 50Volts Peak-To-Peak). The frequency of this ripple is exactly the same as the strange clicking-noise.
For better reparing this ballast I'd be glad having a Schematic of this.
Does someone know where to get this?
Actually it wouldn't be so motivating drawing the schematic (by reverse engineering) because it's multi layer (at least 3 layers) board. :-(
I know there'd also be the possibility to just replace the part. But 150$ (ebay ;-)) for a Ballast seems quite expensive to me - as a student.
Does somene know a better ressource where to get a ballast?
Thanks in advance!
Fab
Comment by lost12, posted on May 01, 2008
Have the exact same problem, guess I will start at looking to replace the fan...
Comment by Guest, posted on Mar 26, 2008
Have exactly the same problem!
WizIt is normal for the lamp's fan to start running , but should actually happen within 15 seconds of starting up. Try changing the lamp's fan and if the problem still persists then you will have to replace the Ballast ( lamp's powersupply )
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