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SIEMENS NIXDORF PCD-4NCsx - Reset BIOS password

paoolica

New Member
Joined
Dec 28, 2021
Messages
2
Hello,

I recently bought an old SIEMENS NIXDORF PCD-4NCsx/25 with Award BIOS and just discovered that it has a BIOS password.
The previous owner provided one, but is not working, probably he forgot it.

Does anybody know how to reset the password, please? Could it work by removing the clock battery (seems like a soldered DALLAS chip)?
I tried with some AWARD BIOS master passwords but with no luck...
 

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Last edited:

GiGaBiTe

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The CMOS battery is potted inside the Dallas RTC module, there's no way to disconnect it without destructive means. Though, it's probably long gone flat, and isn't holding settings anymore.

BIOS passwords on laptops are generally stored in NVRAM somewhere, and aren't affected by the CMOS battery at all. Unless there's some hidden master password, you're stuck unless you can figure a way to clear that bit of NVRAM that holds the password, wherever it is.
 

paoolica

New Member
Joined
Dec 28, 2021
Messages
2
Thank you for the response! I could try to desolder the Dallas chip, and see if it works. The Dallas chip seems that still have some juice in it because I don't receive any CMOS error. Problem now is that I can't manage to disassemble this laptop (perhaps without breaking it), it seems it has a screw right under the left hinge which I simply can't reach. Does anyone has a service manual for this laptop or have an idea how to proceed?
 

GiGaBiTe

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Joined
Apr 30, 2015
Messages
2,861
Location
Austin, Texas
Laptops are almost never intuitively designed to be taken apart. There's probably a hidden clip or screw somewhere holding it together. Manufacturers like hiding them under labels, rubber plugs and feet.

It looks like you have some hex posts holding part of the case on in two of those pictures, those need to come out to remove whatever bit of plastic they're holding down.
 
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