I could imagine the CMOS Bios Battery circuits are quite similar on all recent mainboards.
What does it look like and how does it work?
Background:
My mainboard started draining the bios battery (an ASRock H55M). I inserted a fresh battery with 3.3v. It only measured 2.9V when I removed it, after the PC had been turned off for about 8 hours. While booting, the BIOS is showing the error message "CMOS Setting Wrong" in combination with "CMOS Date/Time Not Set". My suspicion is, that the battery voltage - while being drained by the mainboard - likely dropped below the 2.9V and caused the error.
So started wondering what could have failed and what this circuit would look like.
PC Mainboard - CMOS Bios Battery Circuit
Discussion on projects that are created by users and posted on mikroElektronika website.
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Re: PC Mainboard - CMOS Bios Battery Circuit
#2 Post by AntiMember » 27 Dec 2021 10:39
MICROE makes motherboards? ..
From the center pin CLR CMOS to SIO there is a track. Perhaps through a resistor. 1 or 2 SMD ceramic capacitors are connected to it.
Replace them. Finding an MP schema and boardview program is not that difficult.
https://drive.google.com/file/d/1sk2rIp ... 87-TR/view
From the center pin CLR CMOS to SIO there is a track. Perhaps through a resistor. 1 or 2 SMD ceramic capacitors are connected to it.
Replace them. Finding an MP schema and boardview program is not that difficult.
https://drive.google.com/file/d/1sk2rIp ... 87-TR/view
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