22 Jan
2008
22 Jan
'08
1:10 a.m.
Status of the RESET line and power_good signal? I don't know if the original
power supplies had a "power good" signal but I know that on newer machines,
if the power is out of tolerance, it won't POST.
On 1/21/08 7:55 PM, "Richard Beaudry" <richard.beaudry at gmail.com>
wrote:
Hello all,
I have an IBM PC, 5150, 16-64KB motherboard, that appears to be dead. Power
on produces no display or disk activity (even after a while), and no beeps
from the speaker (I tried a couple of speakers, so I don't think it is a
speaker issue.
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://www.classiccmp.org/cini
From what docs I found on the internet, the
switches are set up properly for
the machine's configuration...
I am pretty sure the motherboard is getting power. I checked at a RAM
socket, and all voltages were there, and well within specifications.
The problem is, I'm not sure where to go from here. I have NO schematics,
and haven't ever troubleshot a 5150 before.
I DO have a good meter, and a scope (and I know how to use it!)
What would be the first things to check?
Thanks for any help!!!
Rich B.