1 Topic by ZADNKOMAD

  • ZADNKOMAD
  • Newbie
  • Offline
  • Registered: 2020-04-23
  • Posts: 8

Topic: Removed UV filter from projector, now one corner is dimmer..

Hello my friends,

Today, I've tried replacing stock UV filter from projector (Benq TK7800M), with replacement borosilicate glass, to allow more UV light to pass through the projector.
When I replaced the filter I've tried powering projector, and it ran for about 15 minutes, before one corner of the screen got dimmer. The rest of the screen is okay..
What do you think happened? Could it be the lamp? or is the chip damaged?
if the lamp is damaged, I could try using some UV lamp.
Sincerely,
Jonathan

2 Reply by ZADNKOMAD

  • ZADNKOMAD
  • Newbie
  • Offline
  • Registered: 2020-04-23
  • Posts: 8

Re: Removed UV filter from projector, now one corner is dimmer..

I've now took the whole projector apart, I've found that one lens in dlp chip assembly got broken. I've removed the lens, and it had big black spot (which would explain the dim screen..)
Now, does anyone have any idea where to get replacement lenses like these (I need one piece of double convex lens.) (Photo with dimensions in following link:  https://imgur.com/a/Vm489gn )

Sincerely,
komad

3 Reply by carl_m1968

  • carl_m1968
  • carl_m1968
  • Member
  • Offline
  • From: Far North almost not Dallas
  • Registered: 2014-10-17
  • Posts: 6,512

Re: Removed UV filter from projector, now one corner is dimmer..

It got broken because it is now getting too hot. UV generates a lot of heat. just try laying in a tanning bed without the cooler running. If you want to run it with out the extra filter you will need to source higher temp lenses an addition to correct size and focal length.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.