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CMOS Resets After Power Outage (Even with fresh battery)

post #1 of 13
Thread Starter 
Hi OCN,

Here's my issue: I have an Asus P7P55D mobo with a i7 860 CPU (ancient, I know).

Whenever I have a power outage or unplug the mains cable to the PSU, the CMOS is cleared and the BIOS resets itself. The screws up my HDD priorities and other settings. (No OC though.)

I've replaced the CMOS battery with a fresh one, and it currently reads 3.250V. The RTC Reset jumper is in the normal position too, so I don't see why the BIOS is getting cleared after loss of power.

I'm running FreeNAS with this setup and it's getting pretty annoying to restore all my previous settings, especially when I'm running the system without a dedicated GPU to save power.

I tried to RMA this board a couple of months ago, but I didn't have my receipt so I couldn't get it replaced.

Any ideas or suggestions would be much appreciated. Thanks!
post #2 of 13
Sometimes the contacts under the battery get bent and don't make actual contact with the batter.

Try checking the voltage on the battery holder's external contacts with the battery installed.

It could also be a sticking reset switch.
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Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
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2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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post #3 of 13
Thread Starter 
Thanks for your reply.

The battery contacts seem pretty clean, both positive and negative terminals. I was able to check the continuity between the battery's + and its contact, but couldn't confirm the - side, but I'm confidant that it's working.

Without the battery, I'm reading from 0.80V to 1.30V, not sure if that's normal.

There isn't any other reset switch that I'm aware of, just the reset RTC jumper.
post #4 of 13
Quote:
Originally Posted by ryansoh3 View Post

Without the battery, I'm reading from 0.80V to 1.30V, not sure if that's normal.

There isn't any other reset switch that I'm aware of, just the reset RTC jumper.

That's the PSU powering the bios chip. Note that it powers the bios chip even with the PSU switched off.

Don't know about the 0.8V, could be to low????

The reset button on the front of the case.
Edited by billbartuska - 5/17/14 at 5:40am
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FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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My System
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CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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post #5 of 13
Thread Starter 
Oh that reset switch. I don't think that's the problem because the issue persists even when none of the front panel pins are connected when we tested it at the RMA center. The guy just used a screwdriver to short the power pin and a ground pin next to it.

Now the voltage reads 0.38-0.45V. Must be of high impedance because it drifts slowly.

Very frustrating indeed, thanks for your help though.
post #6 of 13
With that low voltage try removing the battery ann see if the PSU will hold the bios.
My System
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CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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post #7 of 13
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

With that low voltage try removing the battery ann see if the PSU will hold the bios.


Yup, the BIOS is fine when there is no battery present and the PSU is plugged in.
post #8 of 13
Hmmm.
The bios battery powers the bios OK.
and...
The PSU powers the bios OK.
but...
bios resets with a power failure.

Doesn't make sense.
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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post #9 of 13
Thread Starter 
Well, I'm not exactly sure that the BIOS battery is powering the BIOS. I can't help but think there's a broken solder joint or something...

I'll have to start probing, do you know where the CMOS is? Is it the chip next to the cell?

post #10 of 13
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
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