MSI B550m DS3H Resets Bios parameters when I power off from PSU, coin Battery is OK

[foshland]

Hi to all, I have a B550M DS3H from MSI, it works ok, but when I turn off PSU, It loses the bios saved parameters, changed the 3V battery and measured Vbat line and its ok, 3.2V, so its not the battery. I have the diagram and boardview, updated the bios to latest version, and still no go. I uploaded the 3 files in case someone needs them.


I have traced the line Vbatt to the EC and the RTC and it keeps ok when I remove PSU power, it meassures 3.some volts.


Any ideas? thanks a lot

[DynaxSC]

BIOS settings are more likely stored in the chipset, rather in the SIO/EC. So either the battery power does not reach the chipset, or might be CMOS Reset pins are shorted permanently (maybe a wrongly set jumper?). Also chipset might be partly broken. Look for missing/demaged smd's in area between battery and chipset. Some parameters might also be written into the BIOS chip, if BIOS programming does not work correctly, the effect you describe could occur. Maybe a faulty BIOS chip. But this is not likely, as you wrote you upgraded the BIOS.

& You should decide if this is an MSI or Gigabyte board. More likely Gigabyte, as MSI does not have DS3H in their names.