Stuck pixels (or something else?) on a PB 100

[OneGeekArmy]

Hi everyone,

I'm slowly bringing a PowerBook 100 back to life (it was in a miserable shape). After a recap, it's back in action but its screen needs some love.

There are pink clusters of pixels on the display that suggest excessive pressure (from the trackball for example). They can also be seen when the screen is off.

Are these stuck pixels (or are they dead)? Should I apply heat to them?

Having never worked on a passive matrix, I'd like to see if anyone has a suggestion before I do anything stupid.

Thanks!

 

[Daniel Hansen]

It's physical damage to the liquid crystal layer inside the panel itself, so not something you can repair, sadly. As long as the screen isn't touched further, the symptom shouldn't get worse.

Unfortunately, the only 'solution' to this issue is to replace the screen - not great, I know, especially after all the effort to restore the machine. My 100 also has this damage (less of it, only 3 little spots), and in my case it's not too noticeable while in use. But I'm always casually looking for a (cheap) parts machine to come up.

 

[Paolo B]

Got into PB100 craziness a couple of years ago. Out of a bunch of machines sold “as is” which I tried to refurbish, all of them except one were suffering the same type of damage.
Unfortunately, glues and other materials used for lcd screens were simply not designed for lasting this long.

Generally speaking, all machines were feeling the age, with brittle and yellowed plastics, dead caps, dead HDs, damaged screens and so on.
Recapping brought the main boards back to life and improved the homogeneity of the passive matrix lcd screens, but I can’t say it’s again crisp like new, striping is still somehow noticeable, so I guess it must depend on some other stuff.

Eventually, I put together one good machine by cherry picking the best parts and scrapped all the rest.

 

[OneGeekArmy]

Thank you both for your answers. It's unfortunate there's no miracle cure for this but, yeah, these machines are getting really old.
Looks like cherry-picking parts will have to be the way forward from now on.

But hey - that motherboard is purring like it's brand new again. That's a consolation