----- Original Message -----
From: "Philip Pemberton" <classiccmp at philpem.me.uk>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Tuesday, January 25, 2011 4:44 PM
Subject: Re: WTD: 386 motherboard
On 25/01/11 15:51, John Robertson wrote:
You might want to try replacing the Dallas
Battery backed up RAM as
well, they only last about ten years - perhaps the battery has shorted
and this is killing the data bus?
Tried with the DS1687 pulled, no joy. Date on the chip is only 2002,
anyway.
5V is present on the BIOS ROM, haven't checked anywhere else.
Given the amount of Green Goo around the ni-cad battery, I'm thinking one
of the sockets has succumbed, and the dunk-and-scrub probably finished it
off. Either that or the contact cleaner I sprayed in the ISA slots is
shorting the thing out...
Have you tried using one of those $5 ISA/PCI POST cards from Ebay? I was
working on a Pentium motherboard a few days ago that wouldn't even beep.
After checking the onboard fuse I plugged in the post card into a PCI slot
and all the voltages were there (except for 3.xV which is normal) but
absolutely no activity on the LED's. So I unplugged the ROM chip and plugged
it back in, the unit then fired up.
Most battery leaks tend to take out the keyboard lines which are in the
general area. Never had an issue with washing a motherboard with soap and
water and letting it dry in the basement for a day or two. If something
major is shorting the AT supply should not run.