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 Removing Corrosion View next topic
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k2x4b524p



Joined: 20 Feb 2009
Posts: 217
Location: Nor here nor there.

PostPosted: Sat Nov 21, 2009 6:13 am Reply with quoteBack to top

i just picked up a strange MB it's a 386/486 board with 1 vlb slot but the thing is there is a little corrosion on the 252466TT chip, a very small surface mounted chip, the pins are blue from the corrosion. I cleaned up the battery as much i could, got the corrosion off of it, but the chip concernes me, should i remove the battery and either replace it or use an external one? or is it ok as it?
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k2x4b524p



Joined: 20 Feb 2009
Posts: 217
Location: Nor here nor there.

PostPosted: Sat Nov 21, 2009 6:18 am Reply with quoteBack to top

Also, the board is a UTD4700, 1 vlb slot 1 386 socket and a 486 socker, the 486 socket has 6 rows of pins in a square, so i think it also doubles as the coproc socket aswell onboard everything, i/o ide, floppy
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k2x4b524p



Joined: 20 Feb 2009
Posts: 217
Location: Nor here nor there.

PostPosted: Sat Nov 21, 2009 7:20 am Reply with quoteBack to top

well scratch any repairs on this board, i went to remove the battery and the 252466TT fell right off, taking a good length of the traces with it good thing i only paid 2.50 for it
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T-R-A



Joined: 02 Oct 2004
Posts: 576
Location: Western NC

PostPosted: Sat Nov 21, 2009 7:21 am Reply with quoteBack to top

Quote:
should i remove the battery and either replace it or use an external one? or is it ok as it?


Remove it ASAP. For decayed batteries, I always use an external battery pack (usually 2-4 AA-cells in a holder) mounted as far away from the MoBo as practical:

http://www.bgmicro.com/index.asp?PageAction=VIEWCATS&Category=271

You may be able to remove the "blue powder" corrosion with one of these:

http://www.mcmelectronics.com/product/SABU10191&CAWELAID=220952870
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T-R-A



Joined: 02 Oct 2004
Posts: 576
Location: Western NC

PostPosted: Sat Nov 21, 2009 7:23 am Reply with quoteBack to top

Well, guess I was just 1 minute too late....
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386er



Joined: 27 Jan 2007
Posts: 274
Location: USA

PostPosted: Sat Nov 21, 2009 7:26 am Reply with quoteBack to top

anonamous coward sugested using isoproly acohol for corosion, if i would of known that, i wouldn't be trying to find a working set of mem chips for an ati mach 64. as for ur battery, if its one of those 3 cell nicd cells, then you could leave it or remove it, but the time/bios data will be lost at power off, last week i found a mobo with 3 vlb slots and it was using a 66mhz ibm cpu wich seems to be 386 pin compatible, but the board was FUBARed as it looked like a car ran over it, all the slots were smashed/bent, the mobo was bent, the corner were the kb connecter was was messed up realy bad, i took out the cpu/30pin simms and its 486dlc bios, thats all that could be saved, altho, it had one of those 3.6v nicds, that wasn't leaking, imagine that. the batt outlived the mobo, very rare with ni-cd's
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386er



Joined: 27 Jan 2007
Posts: 274
Location: USA

PostPosted: Sat Nov 21, 2009 7:27 am Reply with quoteBack to top

T-R-A wrote:
Well, guess I was just 1 minute too late....


ur not the only one...
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Anonymous Coward



Joined: 20 Nov 2004
Posts: 589
Location: Shandong, China

PostPosted: Sat Nov 21, 2009 4:26 pm Reply with quoteBack to top

I take it the 66MHz IBM 386 CPU was soldered onto the board? It sounds like a blue lightning DLC-66.
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386er



Joined: 27 Jan 2007
Posts: 274
Location: USA

PostPosted: Sat Nov 21, 2009 7:31 pm Reply with quoteBack to top

yep, it was in a 386sx pinout, its n ibm 50g6663, would be fun to try out, but the only socketed 386sx i got is a 16mhz zeos laptop.
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Anonymous Coward



Joined: 20 Nov 2004
Posts: 589
Location: Shandong, China

PostPosted: Sat Nov 21, 2009 7:47 pm Reply with quoteBack to top

I've heard that the IBM SLC/DLC are 386 bus compatible, but not necessarily pin compatible.
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386er



Joined: 27 Jan 2007
Posts: 274
Location: USA

PostPosted: Mon Nov 23, 2009 12:35 am Reply with quoteBack to top

any pics of the mobo, you'd be surprised at what a good soldering iron, a roll of buswire and a case of beer can do for ya!
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k2x4b524p



Joined: 20 Feb 2009
Posts: 217
Location: Nor here nor there.

PostPosted: Mon Nov 23, 2009 1:00 am Reply with quoteBack to top

i'll see if i can get a good one for you guys
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wdegroot



Joined: 03 Feb 2006
Posts: 488
Location: pennsylvanai

PostPosted: Mon Nov 23, 2009 9:40 pm Reply with quoteBack to top

IBM was licensed ONLY to produce boards with the chip soldered on
not to sell chips separately.
if you found a chip, it would be very unusual
there were TI chips on sime tiny MB
also soldered on. these boards, both the blue lightning and the TI chips,
often only had 4 ram sockets
One I have also has several DIPS plus the 4 30 pin sockets.

One thing you can do if the NiCad battery is
is corroded. Is wash the board with hot water and a brush . Then shake the board and set aside in a warm dry place for a WEEK.
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k2x4b524p



Joined: 20 Feb 2009
Posts: 217
Location: Nor here nor there.

PostPosted: Tue Nov 24, 2009 12:38 am Reply with quoteBack to top

it's not the cpu, it's one of the support chips, a really tiny one, just next to where the battery used to be.
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k2x4b524p



Joined: 20 Feb 2009
Posts: 217
Location: Nor here nor there.

PostPosted: Thu Nov 26, 2009 6:40 pm Reply with quoteBack to top

i got the pics, if i can figure out how to get them from my phone to the net, i'll photobucket them or something
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