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Need some help fixing a yellow blotch on my screen - Page 2

post #11 of 16
Thread Starter 
Quote:
Originally Posted by Diversion View Post

Can you get a good angle on it and see if it looks like small dents in the panel? You get yellow when the LED backlight hits spots like this is why I ask.

I definitely scanned the screen thoroughly. I even used a suction cup, and it seems like the screen is fine.

Though when I press on the mark, the marks get more pronounced, and seemed to enlarge.
Edited by enesup - 2/14/16 at 8:05pm
post #12 of 16
It looks like a pressure spot damage, and I doubt it's easy to fix. It does look like you've got a distortion in the liquid crystal.

Anyway reason for replying was to answer ASUSfreak re Degaussing. Degaussing only applied to CRT screens, they had a thing called the shadow mask just behind the screen, which if it got magnetically charged would lift off the screen, and distort the beam pattern and it would hit the wrong coloured phosphor. Thats why you could get interesting colours holding a magnet to the screen. To help alleviate this, the screens had a coil around the outside, which was a Degaussing coil. Basically it had an Alternating current pulsed through it, which would gradually diminish, and de-magnetise this shadow mask (it was basically a fine wire mesh). Most monitors/TVs would power this coil at startup, and more modern ones of the time, also had a menu option, to trigger it as well. Extreme cases required use of a degaussing tool, which most TV repair shops had at the time.

As LCD's don't have this shadow mask, they can't be degaussed. There is no magnetics involved in LCD tech for displaying pictures.

I hope that at least answers one question.

And Sorry OP, I think your screen may be permanently damaged, and need replacement. Though I hope some peeps more au-fait with LCD construction might have an answer for you. Good Luck.
post #13 of 16
Thread Starter 
Quote:
Originally Posted by Diversion View Post

Can you get a good angle on it and see if it looks like small dents in the panel? You get yellow when the LED backlight hits spots like this is why I ask.
Quote:
Originally Posted by latelesley View Post

It looks like a pressure spot damage, and I doubt it's easy to fix. It does look like you've got a distortion in the liquid crystal.

Anyway reason for replying was to answer ASUSfreak re Degaussing. Degaussing only applied to CRT screens, they had a thing called the shadow mask just behind the screen, which if it got magnetically charged would lift off the screen, and distort the beam pattern and it would hit the wrong coloured phosphor. Thats why you could get interesting colours holding a magnet to the screen. To help alleviate this, the screens had a coil around the outside, which was a Degaussing coil. Basically it had an Alternating current pulsed through it, which would gradually diminish, and de-magnetise this shadow mask (it was basically a fine wire mesh). Most monitors/TVs would power this coil at startup, and more modern ones of the time, also had a menu option, to trigger it as well. Extreme cases required use of a degaussing tool, which most TV repair shops had at the time.

As LCD's don't have this shadow mask, they can't be degaussed. There is no magnetics involved in LCD tech for displaying pictures.

I hope that at least answers one question.

And Sorry OP, I think your screen may be permanently damaged, and need replacement. Though I hope some peeps more au-fait with LCD construction might have an answer for you. Good Luck.

Thanks. That's a shame.

I'll still try though. I did find a method involving warming up a hot cloth and putting it into a bag might work.
post #14 of 16
Quote:
Originally Posted by latelesley View Post

Anyway reason for replying was to answer ASUSfreak

Hmmm... I knew I had it on 1 of my monitors biggrin.gif so it'll be the Iiyama CRT one...

Quote:
Originally Posted by enesup View Post

I'll still try though. I did find a method involving warming up a hot cloth and putting it into a bag might work.

euh? What? tongue.gif
   
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post #15 of 16
Thread Starter 
Quote:
Originally Posted by ASUSfreak View Post

Hmmm... I knew I had it on 1 of my monitors biggrin.gif so it'll be the Iiyama CRT one...


euh? What? tongue.gif

Grab a steaming hot cloth. But it in a plastic bag, then place it over the place of the bruise, while turning the monitor on and off.

Worth a shot I guess. I doubt it would work, but you never know.
post #16 of 16
Quote:
Originally Posted by latelesley View Post

It looks like a pressure spot damage, and I doubt it's easy to fix. It does look like you've got a distortion in the liquid crystal.

This is what i think as well. And why i suggested keeping it on for 24 hours. But that was being conservative. More like days or much longer, a week even, on the brightest setting, or in a closet to get ambient temps up.
Everything is meant to operate within a temp range, I'm sure a frozen ice block pressed against tft crystals is beyond that range. It's likely perma damaged, so start with less extreme measures and go from there, you have nothing to lose.
I was going to suggest massaging it with a hair dryer on a low/med setting, but the warm steamed rag idea that was just posted is probably a better idea. In fact i would try that first now. Not blazing hot though either, like 88F to 100F. A little above whatever the stated working temp of the panel is. Which is probably printed in the manual.
Edited by KGPrime - 2/15/16 at 3:24pm
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