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Fujitsu 186
Posts: 9
Location: long island ,NY ,USA | So have this 386 id like to rebuild but the battery is shot and needs a new one installed no big deal right ? Well the acid leaked and corroded the board a bit . It powers on now so any suggestions would be great . https://postimg.org/image/6uwxw04u9/
https://postimg.org/image/5dshhaerz/
https://postimg.org/image/wrp0cq36z/
Thanks all |
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IDT WinChip
Posts: 237
 
Location: USA | I've seen worse than this before, probably a good wash and scrub under the sink with soap and hot water will be enough to wash away the acid on the surface, but vinegar will go further and neutralize the acid. I prefer warm vinegar. Another option is a can of battery acid detector & cleaner, which can be found where car batteries are sold. That works good too. Hot coffee will also clean battery acid extremely well. |
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TM Crusoe
Posts: 618
Location: Hull, UK | Indeed, if it is starting up as it should you'll more than likely get away with it if you clean the acid away using the means suggested above.
Looks like a DX-40, with cache too. Certainly has the potential to be a really nice machine if you get it going. |
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Harris 286
Posts: 15
Location: Sunny Blackpool | To echo the replies, a good clean should fix this. I will add that a good idea would be to coat that area of the motherboard in something like clear nail varnish to hopefully slow further corrosion. |
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Chips 386
Posts: 38
Location: Canada | Hah! I've got a 386 dx-40 that powers on but just beeps at me, the battery has also leaked and done some damage.
If yours benefits from a clean up and ends up working again it will give me hope for my own.
I junked all my xt/286/386/486 and p1 machines + more 5 years ago or so... what a foolish fool I was. |
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Fujitsu 186
Posts: 9
Location: long island ,NY ,USA | all right so finally had some time to take the motherboard out i'm going to clean it up and buy a battery for it but trying to identify it... that's the hard part no real markings on it has anyone seen this motherboard? yes.. i googled but nothing yet
http://imgur.com/a/aN15Q
heres a pic of the motherboard . anyhelp would be appreciated thanks all! |
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Chips 386
Posts: 38
Location: Canada | I wonder if there's a way you could make your own, out of existing "puck" kinds of batteries. I wonder what voltage it is.. looks like 3-3.6v
Edited by Robman 2016-11-07 10:58 PM
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TM Crusoe
Posts: 618
Location: Hull, UK | You can still buy them, but they're not really worth the hassle when better batteries are around.
It's a 3.6 Volt battery, so you should be able to get away with a single CR2032 coin battery at 3 Volts, you'd probably be able to solder a coin battery holder to the old pads. Failing that, you can use two or three AA batteries and just wire a holder to the pads where the old battery was. This is the safest method if you don't want it to leak again, as you can install the battery holder in the bottom of the case. That way, if the new batteries do leak in a few years it won't go all over the board.
Usually there's a jumper for connecting an "external" battery, but I don't know where it is on your board and I wouldn't want to be plugging power into random pins if you don't know what they do - obviously that's bad. You may be able to find it with a continuity test on a multi-meter if you test for continuity where the original battery was soldered on, it should be one of those four pin headers near the battery. Pin 1 was usually positive and Pin 4 negative. But that's only if you're not comfortable soldering wires to the pads where the battery was as it makes no real difference how you connect it, so long as it works. |
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Fujitsu 186
Posts: 9
Location: long island ,NY ,USA | there is actually 2 spots for external battery hook ups 3.6 and 6volts. i was looking for some kind of documentation on it what some of these unlabeled jumpers on it do
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Fujitsu 186
Posts: 9
Location: long island ,NY ,USA | so after getting a external battery and cutting the leaking one off .. its dead should have left it alone . was working find before i cut the battery off
https://drive.google.com/open?id=0B-tQevIUZut2Q2RxbnNpbUlZRlk rip 386 |
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TM Crusoe
Posts: 618
Location: Hull, UK | It might not be totally lost, it looks like some of the traces are rotted through. If you can figure out where they went and re-connect them with wires there's every chance it could work. Also, it appears the jumper from JP32 should be removed now as you no longer have the "internal battery" installed.
Too many good boards have been lost to the evils of barrel batteries, this was ultimately what murdered the original board from my 486SX - over a decade after the battery had been removed - and possibly an early Socket 7 board. All in all it was better to try because, if it's any consolation at all, the board was pretty much guaranteed to die if you had left that barrel battery installed anyway. |
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TM Crusoe
Posts: 671
| I have used this type of battery on a 486 board before, with great success...
3.6 volt Coin Cell, on eBay |
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386 possible rebuild ?