25 Jan
2011
25 Jan
'11
5:24 p.m.
----- 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 8:05 PM
Subject: Re: WTD: 386 motherboard
On 26/01/11 00:31, Teo Zenios wrote:
Sometimes the lines look intact but they are broken, I use a multimeter to
check point to point on any lines in the area of the leak, fixed a nice IBM
486slc2/66 board that way (broken keyboard line).
Yea, POST cards are super cheap these days and help diagnose issues, plus
the manuals tend to have all the beep codes for most BIOS makers. I have a
parallel port one for older laptops and the ISA/PCI one. The original PCI
slots are 5V only, forget when they went to 3.3VDC.
Why did you solder a resister in the battery charge chain, that would drop
voltage? I use a diode when switching to coin cell battery to keep the unit
Have you tried using one of those $5 ISA/PCI POST
cards from Ebay?
I'm aware of them, but I did NOT know they were that cheap...
*searches*
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)
Why would it be normal for 3.3V to be missing? Was this an old board which
only supported 5V PCI?
I can't see any damage to the keyboard lines... I did resolder a resistor
in the battery-charge chain, and scratch some corrosion off the battery
feed track. The keyboard connector got off pretty lightly it seems.
--
Phil. from trying to charge a battery that doesn't like
that sort of thing.