First post, by treeman
So today I picked up a "faulty" 486 vlb motherboard for practically nothing.
So today I found a cheap motherboard locally a UC4914-G rev 1.0. All I was told it beeps and doesn't post and most likely the external battery that it came with (not pictured is flat) I was happy to take on the project.
On a quick inspection looked fine, I tried a few different cpus and with my overdrive 75mhz I was able to post but very intermittent results, I could enter bios and save settings but would always get memory mistmach even when I saved bios and rest. When trying to get past I would get memory parity errors and never be able to boot.
Few tiems my ram sticks would detect as 256kb or 64kb or 512kb just alot of randomness. The bios would get stuck sometimes then wouldn't post after that until clearing bios by disconnect external battery.
Doing this over and over for a hour I couldn't establish a pattern.
so back to 0 took out the motherboard and put it under good light and noticed what I thought was flux or something, maybye had some work done. I scraped it off with some cotton bud and yes the smell of coca cola or something sweet similar. water damage! now all the intermittent errors made perfect sense typical behaviour.
so i cleaned it all up and narrowed down the 3 sections that I believe have been affected. I have circled the parts in pictures that look black and charred, perhaps there is more that I missed.
I have no idea where to source such parts for replacement or can't find a picture on google of the same board to compare what I need. At the moment I got nothing to lose here so keen to take another project with some soldering. Anybody can help me with tips how I can find parts to replace the damaged ones?
I have circled in red the 3 sections, I should of used a fatter pencil style