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Was not a case of vinegar syndrome? That can sometimes cause a halo effect but it would also be visible when off and is usually more colorful. Could be that you had the Hosiden panel. This is all very interesting to me because until your 750C, I had NEVER heard of a case of this issue on a color...

And that would be the actual panel used. Same situation where they only have a serial number sticker, no direct model number. I know that's a color panel though - the grayscale ones say "MTFT" instead.

Definitely a Hosiden issue, we know that for sure, but that's all we know. On a different slightly related note - check this eBay listing out: https://www.ebay.com/itm/116058248597 Here's something we didn't know previously. The 540c shipped with Hosiden color panels. They must be very rare -...

Honestly, I've just heard so many hypothesis from so many people that I have no idea what to think. Moisture due to defective seal? Defective seal itself? Bad glue? Bad liquid crystal? I wish there was a way to know for sure. The one thing I wonder is why baking a panel would improve the...

Yes. The 540 panels don't have a specific part number printed on them for whatever reason, but it's a Hosiden panel. I believe the best or one of the best they made, it can run in 256 grays mode (although I think it's been calculated to only display around 64 shades)...

This photo was taken after leaving it on for a few hours to show the tunnel vision but you can also clearly see the weird yellowing in the bottom corners. It's the diffuser layer itself and is not something that can be cleaned off.

Yeah it will probably happen to all of them eventually. I'm counting the days till I see it start on my 170.

I've only run into one Hosiden panel (that I know of), and it was the one in my CTX EzBook 800. I only had it on for maybe an hour total as the laptop got varta bombed and died after cleaning, but it worked while I had it on. It was a much newer panel - circa 1998. It was yellowing at the top...

I'll have to ask solidpro on VCF whether he's run into this. That guy has the largest collection of ThinkPads that I know of and has repaired numerous models that should have that Hosiden LCD according to that list. Very interesting that BOTH you had ran into that issue. I definitely think it's...

Was it part number LD1028-020020? This all makes me wonder more what LCD the PS/2 CL57 SX used. https://www.thinkwiki.org/wiki/TFT_display#TFT_technologies_found_in_ThinkPads

Interesting, and good to know. So far yours is the only reference to tunnel vision on those that I've found.

That was a Hosiden panel? It was my understanding that the 10.4 inch TFT panels found in early ThinkPads were a joint venture between IBM and Toshiba - and were the first TFT color panels of that size. 750C may be late enough that they sourced from elsewhere though? I need to look up when those...

Found it. This thing. I think it’s a sponsored video, so take it with a grain of salt whether it’s any good or not, but it looks promising.

I saw something recently on YouTube - a hypersonic (I think, something like that) cutting tool. Looks like a small razer blade but vibrates very quickly. It can make extremely clean cuts in things, would be PERFECT for opening these batteries. Problem is they're pretty expensive, a few hundred...

Alright, makes sense. Texture match is the real trouble though, not color. Makes perfect sense though if the packs you have are beat up.

Ooooh that does not sound fun. I appreciate the suggestion though, if I ever feel like it, I'll take it out. I should probably take everything off the output section and clean under tbh. Will I be delaying that for a long time though? Yes 😅

Question - why are you bothering to build a 3D printed pack exactly? You can get the original packs open with little damage, you can't build a new battery without taking the BMS from an original, and a 3D printed pack won't look good at all on the side of a PowerBook. Why not just reuse the...

Note: This resource has been mirrored here from a page on my website. I'll try to keep this page up to date, but if I forget, the most up to date version will be the one on my website. Link: https://macdat.net/macintosh/powerbook/general/powerbooklcdindex.html PowerBook LCD Part Number/Info...

I do believe these can be rebuilt without resetting or reflashing the BMS.

It’s the PRAM battery being dead that can sometimes cause a Pismo to act dead. If you disconnect the PRAM battery, it will start working again unless there’s another problem.