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Repairing a broken projection tv screen; Can one from another TV be used?

#1
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8/4/09 at 11:13am
  • Joined: August 2009
  • Post Count: 2
Hey everyone, I'm new here and was looking for some input...

I recently acquired a Samsung HDTV tabletop projection television (dont have the model number on me at the moment, but it was made in 2005  or 2006). The TV was free, however the screen was compeletely destroyed.  I am told that the TV worked fine prior to the screen being busted.  The mirror is also missing out of the unit.

Here are my questions...

Let me start off that I am not looking for perfection, just a TV for the bedroom that will get occasional use.

I have a Panasonic HDTV  that has bad convergence amps, and a failing power supply. The Panasonic has the same size screen. Will the screen from this TV work in the Samsung? 

I also have  a good mirror in the Panasonic, as well as a good mirror in a larger 52" Phillips.  These mirrors are a bit larger than what the samsung needs, so I was thinking of using my glass cutter to trim the mirrors down.  Do the mirrors have to be a special shape? Will any excess mirror cause excessive image distortion?

It may sound funny, but I just have these 3 projections televisions and I'd like to make one out of all. Thank you ahead of time for your input.


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#2
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8/12/09 at 10:16am
  • Joined: November 1998
  • Post Count: 2,399
The outer layer (lenticular lens), with the vertical ribs, will probably work well on any TV. The finer the ribs the better. Note that the horizontal resolution is limited by the rib pitch.

The inner layer (fresnel lens) with the circular ribs may or may not work out well. If it did not work, you would see things such as different parts of the picture look brighter or dimmer depending on how far off to the side you are sitting. The inner layer is optimized for the projection distance from the picture tubes to the screen versus the screen size aka the beam spread angle.

Install the inner layer with the ribs facing out. The outer layer can be installed either way. You'll get less glare on the screen with the ribs on the outer layer also facing out but damage or soiling could be more of a problem that way.

Don't bother changing the mirror unless the old mirror has something wrong with it. The new mirror has to capture the entire beam as projected up from the picture tubes or LCD/DLP engine down below which should be most if not the entire area the old mirror covered.  If the new mirror is oversized a little that should not matter. Better results are had using a mirror with the silver in front (first surface mirror), you get fewer stray reflections. But first surface mirrors scratch more easily if you are not careful cleaning them. Suggest plain soapy water and do not rub hard.

Video hints: http://www.cockam.com/vidfres.htm

Edited by Allan Jayne - 8/12/2009 at 05:30 pm GMT
Edited by Allan Jayne - 8/12/2009 at 05:34 pm GMT

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