what causes LCD rot?

[techknight]

You can purchase it online. youll need to get multiple samples and figure which ones work the best. Once the old stuff is off, you can lay the new stuff on behind, and in front. just lay it on there. Eyeball it. check contrast, brightness, etc..

Once you find the best one, then stick with it ;-)

 

[CC_333]

In a pinch, if the old polarizing film is still intact and in *okay* (meaning not great, but usable) condition, could it be reused with new adhesive?

Of course, new film is ideal, but I'm curious if the old film, given the proper conditions, is still viable.

Also, could it be advantageous to preemptively replace the film on certain at-risk LCDs (in general, those stored in hot, humid environments would seem to be particularly prone to adhesive rot, if I'm interpreting this thread properly) to prevent this kind of thing from occurring in the first place?

c

 

[techknight]

How would you apply new adhesive without imperfections/bubbles? 

Then you would need sheet adhesive that bonds clear. 

 

[Paralel]

I'm glad this issue has been definitively solved. I've had this happen to several screens, and never been completely sure of the cause since I've had poor luck getting the polarizer separated without damaged the underlying screen.

 

[Byrd]

I would say it's far from definitively solved?  Unless we can find a cheap substitute replacement polariser film, LCDs will continue to degrade over time.

 

[goncalo]

I've bought a "Polarizer Film Angle Tester" from aliexpress (~10€) - I'm hoping it will help me solve the angle question regarding this PowerBook and many other screens.

But alas, this project is on hold right now - this retrocomputing stuff is a slow process for me ;-)

As for prices, I've found that a 17" sheet is about 10€. But I've recently noticed they are getting more expensive..

 

[goncalo]

I’m having this issue of “lcd rot” in many systems. Symptoms vary - from cracked panels to fungi-like patterns

first it was a Digital HiNote 486 laptop - it was carefully stored in a horizontal shelf without any other weight on top - the screen cracked al liquid cristals came pouring out.

Some compaq LTEs are also turning up with strange patterns. They have had no physical stress placed upon, but all of the sudden the lcds start to rot.

Two PowerBook 160 have also developed cracks and air bubbles within the lcd layers.

This is a serious concern to those that collect and enjoy having these old machines in working condition..

So, just to clear things up.

There where no "liquid crystals pouring out", it was the adhesive pouring out.

And while thinking about the aforementioned crack, I wonder if is there a relation between the angle of the polarizer and the angle of the crack on the film.

That could mean this panel uses a 90-degree polarizer since the crack is at about 95/100 degrees.

 

[Paralel]

I would say it's far from definitively solved?  Unless we can find a cheap substitute replacement polariser film, LCDs will continue to degrade over time.

When I said solved, I meant the mystery syndrome, not solved as in cured.

So, just to clear things up.

There where no "liquid crystals pouring out", it was the adhesive pouring out.

And while thinking about the aforementioned crack, I wonder if is there a relation between the angle of the polarizer and the angle of the crack on the film.

That could mean this panel uses a 90-degree polarizer since the crack is at about 95/100 degrees.

What exactly do yo mean by "pouring out" as in the adhesive is deadhering? It's clumping? It's crystalizing?

I'm curious as to exactly what the adhesive for the polarizer is doing. If we can characterize what is happening to it, then it might be possible to come up with how and why, which can possibly lead to a way to protect systems that aren't yet impacted. My best bet, from seeing the pictures only, is some kind of chemical reaction is happening to the adhesive. Now, what exactly that chemical reaction is, needs to be determined.

 

[Paralel]

Dupe

 

[Papichulo]

Wait so the pink blobs i have in my powerbooks is just the film? Its not permanent damage??

 

[bengi3]

Its permanent. I took apart one LCD that had both: the vinegar syndrome and the rot. The pink stuff is in. between the two layers of glass.