Pentium Pro VRM missing parts (Chaintech 6IDM) \ VOGONS

Pentium Pro VRM missing parts (Chaintech 6IDM)

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First post, by Predator99

Posted on 2018-07-10, 07:35

Predator99 Offline

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Today I received some (really) scrap boards that I bought because I spotted a Pentium Pro board in the pile. Its a Chaintech 6IDM M101.

Its not in a good condition. Some traces on the back and one cap needs to be fixed. Already found the BIOS and the RTC should also not be a problem.

But what I did not expect that the voltage regulators have been removed 🙁 I have found good photos of a complete board. The one on the board itsself is a "EZ1084CT":
https://www.mouser.de/ProductDetail/Semtech/E … IfpbJ1LzhOn3w==

They are rather expansive but I think I can take use a "LD1084V TO-220AB" as replacement?
https://www.voelkner.de/products/670133/STMic … tellbar-5A.html

Bigger problem is the VRM in the socket. Here two power regulators have been removed and I have no idea what to put in there?

I know I can simply buy a complete new one but I dont want to spend too much money as I dont know if the board is fixable at all.

Does anybody have a similar VRM and can take a look what parts are missing?

Thank you!

Reply 1 of 7, by eisapc

Posted on 2018-07-17, 07:46

eisapc Offline

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Never seen this board layout of VRM before, but if you can't find replacement,drop me a pm.
Still have a box full of Compaq VRMs for PPro machines.

Reply 2 of 7, by Predator99

Posted on 2018-07-25, 13:33

Predator99 Offline

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Thanks for your offer!

In the mean time I made some progress 😎
- ordered a 155681-001 Compaq VRM (8€ incl. shipment at Ebay)
- soldered a LM1084IT-3.3 Texas Instruments for the missing "EZ1084CT" - 4.50€ shipped

Also fixed some damaged traces on the back and installed a Dallas Chip:

I am rather surprised the board is powering up as I really was unsure if I got the correct parts 😎

However, currently it still halts after the RAM test...dont think its a major issue howver...

Reply 3 of 7, by lukas12p

Posted on 2020-06-26, 17:53

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Hi
What RTC module are You running? I have ordered few DS12C887 from China, but they are used and don't hold memory

Reply 4 of 7, by red-ray

Posted on 2020-06-26, 18:09

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I have modified the ones I have to take a CR2032 as per https://www.classic-computers.org.nz/blog/200 … attery-chip.htm

Reply 5 of 7, by lukas12p

Posted on 2020-06-26, 19:11

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red-ray wrote on 2020-06-26, 18:09:

I have modified the ones I have to take a CR2032 as per https://www.classic-computers.org.nz/blog/200 … attery-chip.htm

Thank You, that works now 😀

Reply 6 of 7, by S2 Sedan

Posted on 2024-02-03, 16:18

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Hi,

can you backupo and upload the BIOS please?
I got this board, but it does not boot 😒

Reply 7 of 7, by weedeewee

Posted on 2024-02-03, 16:27

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S2 Sedan wrote on 2024-02-03, 16:18:

Hi,

can you backupo and upload the BIOS please?
I got this board, but it does not boot 😒

Next time do your due diligence in searching for what you need.
For now https://theretroweb.com/motherboards/s/chaint … ch-ct-6idm#bios is where you can find it.

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !
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