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About NoofleBot

  • Birthday June 8

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    Modern RISC PPC (PowerPC) computing, Vintage computers, computer repair, high end audio equipment, RISC, computer history, Retro gaming, RGB, Sony BVM's & PVM's, Obscure computers, Obscure A/V formats, Archive grade digital physical media (CD's, DVD's, Blu-Ray's, M-Disc), Animation, film, drawing

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  1. Responding to "BadGoldEagle" I've already removed the Maxell batteries from the board and used white vinegar to clean off some of the corrosion (I wish I would have used a toothbrush, like you said). The Serial controller may not need replacing, one leg looks like it could be fully rusted but I don't think that's the case yet. I'm definitely planning on posting some pictures as I progress on the board I may even make a youtube video or two. I do have a multimeter which I haven't really used mostly because it's super cheap, it should work though if all it has to do is check if a current can pass through a trace. Speaking of recapping a board I also received a Macintosh IIci which has some leaky capacitors (just thought I'd mention it). Thanks for the link to the Macintosh IIfx schematic this should help me order parts. I may be getting some quadra's tomorrow and if any of them have leaking batteries I'll know what to do differently thanks to your advice on using a toothbrush to clean the board. Responding to "trag" I've been watching some videos on youtube about soldering (and the different types/methods) recently so I'm learning what I'll need to do to attempt a repair on this board. 85C30 / 53C80 appears to be safe.
  2. Thanks for the advice! I'm going to at least attempt a repair on the board however I am new to repairing electronics, so new in fact that I don't even have a soldering iron (I'm looking into getting a nice soldering iron station). Of course I'll also have to learn how to solder first so that'll take some time. Addressing some of your questions / concerns: Responding to "trag" I was worried about the Serial PIC being damaged after I watched a video jason's macintosh museum made about the IIfx when he said something about that chip controlling all the I/O, luckily the chip appears to be okay, after cleaning the chip it had little corrosion left on the legs and the traces around the Serial PIC seemed to be attached to the legs. UD16 is D43256AGU-10LL which after cleaning was in rough condition, it had some missing pins/legs so I'm guessing I'll need a replacement for that if I want to attempt repairing the board. I'm not sure which part you are referring to when you say 85C30. I have plenty of time to work on the board and I am a patient person, even if I do fail in repairing the board it will have still been enjoyable attempting to fix it. Responding to "IIfx" (Very fitting name you have.) Thanks for offering a replacement board just in case repairing mine doesn't work out. I do have a eBay which I occasionally sell vintage computers on but I'm not planning to sell my IIfx on there if I can fix the logic board or if I purchase a replacement from you. I think the Macintosh IIfx is a really cool machine, everything about it from it's looks to it's size and it's rarity is what really makes it special (also I love vintage computer workstations), I've always wanted a IIfx so If I can get this working I promise I won't sell it. I'm researching ways to remove the rust off of the shielding, electrolysis rust removal is interesting as it doesn't use any acids. Responding to "Johnnya101" If worse comes to worse and I can't fix the logic board I'll sell you the RAM, what do you need it for anyways? Are you just looking to upgrade your ram or are you missing ram? I know that the ram for the IIfx is rare as apple decided to use a special type to improve performance (also another reason why I love the IIfx, it's wicked fast as the code name would imply). Responding to "jonpurdy" Imagine how painful it would be to see those photos in 3D. Yeah, it sucks. My electronic repair skills are pretty bad besides using a screwdriver to replace stuff so I think the chances of me getting my IIfx working are slim but I might as well try. Responding to "AwkwardPotato" My hopes of cleaning the board in the first place weren't high to start with so if repairing the board doesn't work out I won't be disappointed. the SIMM slot closest to the PRAM battery holders actually is in great condition for how close it is, none of the electrical contacts have corroded and only the metal tab nearest to the batteries saw any corrosion. UF18 looks fine besides some corrosion on the legs, UD16 will definitely need to be replaced. Also I like your profile picture. Once again thanks for the advice if you have anything else you can add to the conversation please do, also I'm most likely going to need a schematic of the logic board for the macintosh IIfx so that way I can order any of the parts that fell off. Thanks again, -NoofleBot
  3. A few days ago I picked up some vintage apple Macintosh computers along with some vintage apple accessories and was ecstatic when the person giving me the computers said I could have their Macintosh IIfx in near mint cosmetic condition (besides some yellowing of the plastic) free of charge. When I got home however and opened the beastly machine I was presented with one of the worse cases of PRAM battery leakage I have ever seen. Both the PRAM batteries had leaked onto the motherboard and it was not pretty to say the least. Now I'm tasked with repairing my Macintosh IIfx but I don't even know where to start. Any advice? Here's a picture of the leak before I started cleaning it: Here's a picture after I got some of the gunk off (yes many parts fell off.): Can I save this logic board? Will it take years, months, weeks, days? Is this worth my time. Is it impossible or possible but very difficult? I really don't want to see this computer go.