I'm lightly trying to solve this one myself as I noticed my NEC Versa P/75 and M/75 that have 800x600 screens turn yellow-tint if I don't use them for awhile....but if I use them about 30 minutes, they are very bright, and the colors are dead-on. I'm thinking the panel is heating some layer where the adhesive is deteriorating and then LCD being used is heating the adhesive and "cooking" it back to normal. Those both are using NL8060AC24-01 panels, one a new-old-stock one. I also notice the yellow goes away semi-permanantly if I use them a lot.

It also could be the CFL's too, I replaced the two in my M/75 (the NOS Screen) and it improved by 5-10%, now it's perfect.

creepingnet wrote on 2021-07-14, 17:15:

I'm lightly trying to solve this one myself as I noticed my NEC Versa P/75 and M/75 that have 800x600 screens turn yellow-tint if I don't use them for awhile....but if I use them about 30 minutes, they are very bright, and the colors are dead-on. I'm thinking the panel is heating some layer where the adhesive is deteriorating and then LCD being used is heating the adhesive and "cooking" it back to normal. Those both are using NL8060AC24-01 panels, one a new-old-stock one. I also notice the yellow goes away semi-permanantly if I use them a lot.

It also could be the CFL's too, I replaced the two in my M/75 (the NOS Screen) and it improved by 5-10%, now it's perfect.

Mine are also practically red/orange, a little less bright than they should be when I turn them on, and after a few minutes using them, they get a little better. I thought it was something that had to do with heat, so before turning them on, I left them in the sun. They were pretty hot, but still, the first match the screen would be the same way, red/orange. The only thing I can imagine is that it could be a capacitor (bad capacitors have difficulty accumulating the necessary energy) Although, I believe that fluorescent lamps also glow less in cold start, which brings us back to ccfl lamp.

I know there are 1001 mods to replace the lamp with led strips, I think it would be a good idea to try this before I start changing capacitors, removing polarizer, etc...

the liquid crystals do move thus they need to be encouraged back by reverse gravity ..... incentive to preserve system life for a year or so upside down in storage?

I think I have a clue: I have a G3 Lombard powerbook, which has the screen with this problem. I could notice that the apple behind the LCD is also dark and yellowish, it will look brighter together with the LCD after a few minutes. My guess is that it really is the lamp that is producing this yellow color, and the lack of brightness, since the apple, is just the lcd light, regardless of what the lcd is showing, the backlight will always be the same.

What happens is the plastic right next to the backlight elements turns yellow over time, I think from the heat.

For those who want to know the solution:

I just bought a new lamp, and the screen went back to white. The problem was really the lamp, which was yellowed.

Hi Rikintosh,

I also have a couple of laptops with yellowish screens...
Before I go about risking opening the screens (we are talk about very brittle old plastic here) can you please post a few pictures of how you swapped that lamp, assuming you have them?

Thanks,
EduBat

EduBat wrote on 2021-09-07, 20:52:

Hi Rikintosh, […]
Show full quote

Hi Rikintosh,

I also have a couple of laptops with yellowish screens...
Before I go about risking opening the screens (we are talk about very brittle old plastic here) can you please post a few pictures of how you swapped that lamp, assuming you have them?

Thanks,
EduBat

Unfortunately I didn't take pictures, and I don't have the lamp anymore, but most of the screens are simple to open, the construction method is still used today, the screen is usually held by an adhesive plastic, and snaps sometimes , small screws. The plastics have to be removed (cut or unstuck) and the canvas has a metal frame that holds everything in place, this frame is made of tin or something so it's easy to crumple it, be careful.

When you remove the frame, everything is a big sandwich of polarizers, reflectors, acrylic and the LCD display. The lamp may be glued to the carcass, a little heat helps to soften the glue, be careful when handling it as it has toxic chemical components, wear masks, gloves and protective glasses