help solve a mystery! my friend has this Thinkpad....

help solve a mystery! my friend has this Thinkpad. the LCD powers up fine, but slowly fades to white starting from around the edges of the screen. after powering it off and letting it sit for a few hours, it powers up fine again. got any ideas?

a Thinkpad showing the Windows 95 desktop. the pixels around the edges have faded to white with some sort of vignetting effect.

a Thinkpad showing the Windows 95 boot screen. The color LCD looks perfect.

Like 31 Dec 2023 at 20:51 | Open on mastodon.social

4 comments

Que

@tubetime don’t LCD go white as they heat up? Maybe panel is degraded and normal operations is now too hot. Would explain it cooling down and working again.

31 Dec 2023 at 20:54 | Open on infosec.exchange

Andres Jalinton

@tubetime
Is it hot on the bezels?
Could be:
1.- Heat from the fluorescent lamp that makes the liquid crystals to change the polarization of the light in the wrong way.
2.- Heat increasing the effect of the already de-laminating screen (does fix itself if you press the bezel?)

31 Dec 2023 at 20:59 | Open on mastodon.hardcoredevs.com

Jason P 🌈

@tubetime Mac people call this tunnel vision. Seems to be from moisture ingress. Baking the panel - or leaving in the Cali sun on a dry day - might help.

31 Dec 2023 at 21:44 | Open on mastodon.sdf.org

8080ingo8080

@tubetime Hi, it‘s maybe a loose connection of one of the LCD bias voltages. As there is only minimal current flow, the Panel charges up with time?

1 January at 12:25 | Open on mastodon.social

Go Up