CurtPalme.com Home Theater Forum

stgdz · Joined: 07 Dec 2008 Posts: 107

Been using my 1272 for awhile and I noticed that there is a brighter circle at the center of the image. This is a neckboard magnet adjustment correct?

stgdz · Joined: 07 Dec 2008 Posts: 107

bump for some help

Mark_A_W · Posted: Mon Jun 29, 2009 11:28 pm Post subject:

picture please

AFryia · Posted: Mon Jun 29, 2009 11:30 pm Post subject:

All the time or just at startup and shut down?

Spot burn perhaps?

prover · Joined: 07 Nov 2008 Posts: 166 Location: Stuttgart, Germany

Can you provide a picture?

prover

stgdz · Joined: 07 Dec 2008 Posts: 107

finally got the pictures off of my camera

Its pretty prevalent when the scene transitions.

Mark_A_W · Posted: Mon Jul 20, 2009 12:50 am Post subject:

Phosphur delamination?

Like a 1292...maybe..

prover · Joined: 07 Nov 2008 Posts: 166 Location: Stuttgart, Germany

This is phosphor delamination! I had the same on the green tube of my 1292 Sad

You need a new tube...

prover

stgdz · Joined: 07 Dec 2008 Posts: 107

rad, any idea what may have caused it?

ecrabb · Posted: Mon Jul 20, 2009 2:33 pm Post subject:

It's a manufacturing defect or material failure. For whatever reason, the phosphor coating starts to detach from the glass tube face.

Two question I have is a) how delam makes that portion of the image brighter, and b) how the phosphor stays intact and doesn't become burned. I mean, it's a super-thin layer of basically dust particles (with a binder), and not being attached to the tube face, how does heat not destroy it in short order - especially the blue.

Ragardless, you can pop the lens off the blue tube and have a look with a flashlight - you should be able to see something if it's truly de-lamination.

SC