3 ms·
> If you ever remove the interconnection PCB, make sure to put it back with the same orientation. It will fit just fine when rotated 180 degrees but the scope w
by benob 1y ago
> If you ever remove the interconnection PCB, make sure to put it back with the same orientation. It will fit just fine when rotated 180 degrees but the scope won’t work anymore!
I remember pulling a 486 out of its socket in the 1990s and putting it back with the wrong orientation. There was a poc and a bit of smoke. Something on the mainboard had burnt and it wasn't working anymore.
I used smell to locate the fault, a big trace on the PCB, which I soldered back and magic, it all worked again...
- MarkusWandel 1y agoI have a story like that! Back in my lab rat days, I dropped a scope probe and its grounded sleeve skittered down the back side of a powered-up, prototype memory board (with 240 individual RAMs on it), leaving a trail of sparks. After that it was dead. Uh oh. We needed that board. What to do? Well, it can't hurt to try. We had "freeze spray" for debugging purposes, so got a bottle of white-out handy (what's that?), frosted up the board really well on the component side, powered up, and quickly marked the devices that defrosted notably quicker than the rest. Got the solder station lady to replace all those parts and it worked again. Old days...
- minipci1321 1y agoThese days they do that using a vape, cover the PCB with a thick layer of vapor and see where it raises the fast after power-up. Youtube has videos.
- tverbeure 1y agoUsing your comment as a crutch to post a link to my Eye of Sauron function generator story: https://tomverbeure.github.io/2023/01/02/HP33120A-Repair-Shutting-Down-the-Eye-of-Sauron.html https://tomverbeure.github.io/2023/01/02/HP33120A-Repair-Shu.... That was an incredibly satisfying repair if you ignore days of dealing with after effects of burnt PCB material in your lungs.
- deleted 1y ago[deleted]
- djmips 1y agoWhat a relief! That you dared to try it. Much harder today...