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NiCD and NiMH batteries can last decades (actually surpassing Lithium Ion), but only if their seals aren't broken, so the air can't get into and oxidise them. But as we can see, most of those batteries leak after all that time as the seals get breached, and the air enters, and the electrolyte...

Thanks! Well I got the 270c yesterday and is uses bit different array of caps: Here is the list: Logic board: 4x 35V 100uF 10x10mm footprint 1x 35V 47uF 8x8mm footprint 1x 25V 100uF 8x8mm footprint All those must be 10-11 mm tall or less 1x 25V 33uF 6x6mm footprint, 6mm tall Inverter: 1x...

Hey, anyone has a list of all PB Duo 270c capacitors? Does the LCD on it also needs a recap? Thanks, M.

My hands on experience with Apple laptops: For the polymer caps, on the MacBooks that run 12.6V PPBUS_G3H (main power rail), they used all 16V caps. And they hold very well, no instances of being shorted or anyhow degraded over years. And those machines also run very hot, something that isn't a...

There is an issue. Tantalum caps have much greater voltage derating. In simple words, tantalum capacitor that "sees" 12V needs to be more than 16V rated, that one should be 25V. Other types of cap technology don't have this problem. Apple used same rated capacitors (16V 47uF) on multiple voltage...

I tried DOT3 brake fluid on one 512K before (it was really bad shape, and painted with some quite thick paint), and it didn't go that well. The plastic became weakened around the top vents which then cracked. I managed to glue it back together, but it is really bad. Also the plastic got streaks...

Hey I just got this 512K in somewhat sorry shape. Has some screen burn in, the case is super yellowed. And of course, the machine doesn't work - fuse is missing, this was told to me by a previous owner who examined it before. But it has SCSI and RAM upgrades (some snap on thing) But the main...

From my memory, LCIII has one cap marked the wrong way on the logic board, so the polarity is incorrect. Electrolytic caps will survive that reverse polarity (and might even self reform to reverse polarity after time), but tantalum caps really hate it and may be shorting it. Or it could be just...

I would try to get a 256MB or 128MB stick in there just to see if it works. Perhaps 512MB uses too high density chips and it somehow messes up the memory detection. Or the stick itself is bad (not likely, but possible). Or it has somehow wrong information on the SPD EPROM so the iBook "thinks"...

'junk from China' means junk from China. Something that is really poorly made and not up to any standards / regulations. Of course you can have something that is U.S. made considered as junk, and something made in China that is considered top notch. I had good experience with Mean Well PSUs and...

Just saying. If the Chinese ones would have been equally good, then I would say to just go for it. But believe me what crap are they putting into. No fuses, transformers without protective tape between the layers, no safety rated caps, bad solder joints, etc. Of course, if yours cannot be...

Anyways, thanks for all the answers. Yes I know how to open the charger without damaging it (vise method), but sometimes the case might break at the top lip. I did 4 or 5 chargers like that, and 2 of them there was bit more damage than anticipated, but still nothing serious. For the display, I...

Why gut an old Sony or Delta made unit that was made up to a very high standard and put inside junk from China? I am 100% positive that Chinese one would have worse ripple and electrical noise, and it could even burn a house down. For that price, it is definitely going to be a dodgy or even...

Hey, I am wondering what should I do in terms of preventative maintenance on a PowerBook 165c? I heard that screen should be recapped. I had it done on few before - like 160 and 140, but that ones were clearly defective (contrast all over the place, etc.). And caps were leaking all over the PCB...

Fixed! It was that RAM chip at G5 afterall.

I replaced the missing 74F253N and removed all the upgrades. I am getting now error 20100, so looks like G5 is the culprit now

I tried it, but it G12 is actually 2 chips on this board, the original one and the other one "piggybacked" - soldered on as a part of a upgrade. I tried another one on the top of those 2 and it didn't help. So now I removed the memory upgrades. I am missing one 74F253N (location G13), so I...

Anyone? I would like to save at least the logic board :)

I put the logic board into my Plus and it showed: 028000 error code. If I am not mistaken, this means the chip in location G12 is bad. But that board is DIY upgraded which error code might mean something different Any suggestions? Or should I just remove the memory upgrades and go from then?

Hi, time to bump this thread, as I am going through my unfinished projects. And I think it is about the time to finish this one :) Anyone knows if the logic board from the newer machines fit into the A1052 case? Thanks!