First post, by firstname.lastname@example.org
Was wondering, i have an old small form factor 286 motherboard that i was sometimes back asking "how many times a 286 cpu can survive being turned on in the wrong orientation".
Have been tryin to troubleshoot it not posting up and it did have some nasty varta menace but it seems that, testing with post card all the voltages goes through, reset works and 5 volts are present in the cpu, oscillator and memory. Though iam not an electrician...
But something weird is happenin in the battery circuit. Varta is removed but the plus side of that should go through a transistor and maybe some resistors? But theres no connection, maybe traces but that transistor dont have a ground anywhere and the battery plus side is getting 2.3 volts when powered, although that transistor is getting nothing. The second transistor (side by side) is getting 0.1 volts but it has a ground connection. I think those are dead but can it drown the whole system? I did read that some old motherboards wont turn on without a working battery?
Thanks in advance again!