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Motherboard Thinkpad 755CD

Older ThinkPads from the 300, 500, 600, 700 Series, iSeries, Transnote etc.
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Wulp
Posts: 2
Joined: Fri Apr 03, 2026 4:35 am

Motherboard Thinkpad 755CD

#1 Post by Wulp » Thu Apr 09, 2026 11:40 am

Hello,
I just got my hands on an old 755CD. Apparently, it is protected by a BIOS password.

In the meantime, I’ve read just about everywhere that the easiest way to bypass it is to get a different motherboard.. (Working with an EEPROM is unfamiliar to me..)
Does anyone happen to know which ThinkPads have the same motherboard as this one?

I shouldn't look on Marktplaats: I live in Europe and the shipping and customs costs are huge...

Thanks!

solidpro
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Joined: Thu Jun 11, 2020 11:46 am
Location: Milton Keynes, GB

Re: Motherboard Thinkpad 755CD

#2 Post by solidpro » Thu Apr 09, 2026 12:51 pm

The password is easy to deal with, with the right tools. I think if that's beyond you, you'd be better off just getting a complete one without a password.

Note there are two 755CD machines - a 486 version and a Pentium version and things like the RAM would not be interchangable, so even if you found a motherboard, it might not be the right one.

I probably have a complete 755CD somewhere, but it'll have been restored as in recapped and serviced and stuff.

Wulp
Posts: 2
Joined: Fri Apr 03, 2026 4:35 am

Re: Motherboard Thinkpad 755CD

#3 Post by Wulp » Thu Apr 09, 2026 1:47 pm

Is there some way to find out which 755cd I'm talking about?
The 486 or the Pentium?
Or do I need to get it booted up first?

tisonelyme
Posts: 1
Joined: Thu Apr 09, 2026 3:47 am

Re: Motherboard Thinkpad 755CD

#4 Post by tisonelyme » Thu Apr 09, 2026 7:10 pm

Hi Im a newbie here but I just want to say it is well worth googling how to bypass a password on a older style thinkpad You just have to find the eprom In my case I have only done it once on a thinkpad r30 but I was lucky it had dip switches which made it very easy A 755cd is a worthy vintage thinkpad to have in a collection Im envious lol

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