Little bit of troubleshooting tonight.
Bought a can of air (Component dusting spray, some complex molecule) at Radio Shack tonight and began dousing various components on the board until I got a good response.
After about five seconds of having been on, this one melted away the frost..
Gave it a good solid spray and switched on again. BEE-DOOP
Nothing useful on the screen but a POST beep is good.
Cleaned it all up and dried it out.
20140529_200109 by renault9gta, on Flickr
All good and well.. ordered a replacement. Decided in the interim to grab the soldering iron.
Yup, that’ll do. Tried powering the board up without it in place. BEE-DOOP.
So, what is it?
It’s a SCN2681, a dual UART. It sits right up against and interfaces with the 8088 below it and also the funny socketed HP chip also.
Seems to be fairly central to the entire architecture (well, that figures really) so hopefully a replacement will liberate some life from it and allow some trash, or better, sensible data onto the screen,
I’m just hoping that “BEE-DOOP” is a good beep code..
…at least it’s A beep code.