Did you actuality measured the trace with v+ vs the board gnd , coming from the battery holder to make sure you have ~3v ? I had cases with broken/oxidized traces or oxidized parts so even there was a new battery in the holder , i didn't had any voltage from it on the motherboard .

bogdanpaulb wrote on 2023-03-17, 13:34:

Did you actuality measured the trace with v+ vs the board gnd , coming from the battery holder to make sure you have ~3v ? I had cases with broken/oxidized traces or oxidized parts so even there was a new battery in the holder , i didn't had any voltage from it on the motherboard .

This, also reseat the chip in case it isn't always making proper contact due to pins oxidation.

Will check that out, as I've only measured the batteries themselves. Thanks!

You can check also the voltage at the clr cmos jumper , you should have around ~2.7v when is in the normal position .

Years ago I built an AT Super 7 system out of parts I had lying around to give to my aunt. Every time I would move the case, it would clear the CMOS memory, and I didn't understand why. So long as it was stationary there was no problem. After upgrading her to something better, I took it apart and realized that I had missed that there was a standoff in the case that did not match up with a screw hole; when you would move the case the motherboard would ground and clear the CMOS.