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The iconic 7 ball!

They should be the same across the entire Duo line.

I’ve had this same problem (to a much more minor degree) on my PowerBook 540. I found the acrylic sheet was permanently stained and could not be fixed. Maybe your case is different, but I wouldn’t count on it. Worth a shot in trying though.

I agree, looks more like the backlight diffuser got liquid contamination somehow rather than vinegar syndrome. Should be plenty of supply of dead panels to swap those parts from.

Film angle should match the angle that the scrapes/stripes are going. Hard to tell with the "blotchy" form of it here, but I think it would be 45 degree.

If the IIc Plus sold 200,000 units then where are they all? With how rare they are, it doesn't seem right to me that they sold anywhere close to half as many units as the original IIc.

It's developed vinegar syndrome. I know it doesn't have the typical "scrapes" that indicate vinegar syndrome, but it appears differently on different types of displays, and this inverted bubble is a way it commonly shows up on passive matrix displays. This can be fixed by replacing the polarizer...

Yeah, if the top two aren’t working then about half the screen will go out. I’m thinking in this case though that it’s probably more likely a loose or damaged display cable, or an intermittent trace perhaps.

That's what you get if one of the vertical ribbons is bad, but the horizontal ones can absolutely take out half the screen. You see this all the time on the PowerBook 100. Could also be a bad trace though.

2 things to check. First, the display cable is pretty tricky to fully reinsert into the connector and easily comes loose. Make sure you aren’t chasing the wrong problem. Second, shine a flashlight up to the ribbons around the screen with the integrated driver ICs. Check for any dark spots...

How on earth have I gone this long without knowing these existed. Never seen a photo of one. Ever.

They made one in gray??

The only polymer caps I know of that were made during this time were the Sanyo OS-CON caps, which are purple and labelled "OS-CON" on the side. These are also always through-hole radial. One of the caps on the PB100's inverter board is polymer. I also suspect the 4.7uf 50v SMD cap on the...

That’s just how small they could make an electrolytic at that time. You’re fine to swap it for a tantalum.

The official stickers definitely wouldn’t have said “mod”’on them. In fact, I don’t think the Apple upgrade even gave stickers.

Ditto, nubbed batteries won't fit. Tenergy seems to be the only place in the US that offers name-brand 4/3A cells (the rest are all generics). On their website, you can pick between cells with tabs pre-attatched, or cells without tabs. The one annoying thing is they've about doubled in price in...

Thanks!

I think that's happened to me once or twice - in those cases, they returned to normal once the IPA had fully evaporated. Either way, there's certainly no harm in replacing them. Where do you source replacements from?

The rollers won't be harmed by IPA, I can say from experience. I haven't had bad rollers on a 100 series yet, but that's just my experience.