Old TT motherboard restoration

General discussions or ideas about hardware.
mgi
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Joined: Sun Jun 06, 2021 4:37 pm

Old TT motherboard restoration

Post by mgi »

Hi,

With my TT I received also an old spare motherboard which I was told had some issues in the past and was replaced with Revision J. It is one of the first ones with daughter-board but I still would like to see if it can be rescued. I understand all I need is a PSU so I can plug her and test.

Any ideas where I can find a PSU which will work with the TT?

Thanks
Michal
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frank.lukas
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Re: Old TT motherboard restoration

Post by frank.lukas »

You can use a normal PC Style AT Powersupply ...
mgi
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Re: Old TT motherboard restoration

Post by mgi »

Thanks Frank,

will have a look and maybe try old AT tower with PSU as there are few of those on eBay. Any mods needed or it just works?

Michal
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frank.lukas
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Re: Old TT motherboard restoration

Post by frank.lukas »

no mods needed ...

You can also use a ATX one with a ATX-AT Adapter.
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DoG
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Re: Old TT motherboard restoration

Post by DoG »

Try it with the PSU you have on the working TT maybe?
mgi
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Re: Old TT motherboard restoration

Post by mgi »

It is an option but don’t want to end up with two not working ones :)

Only starting tinkering with them and just managed to get one working with new card, storm and lightning. This is the old one - do you think it make sense to try and resurrect it? All I can do really is plug it and see if it is working. If not I can look for someone who could do some more advanced diagnostics?

18EF446E-74A0-46CD-9512-6299BEA8FE90.jpeg
18EF446E-74A0-46CD-9512-6299BEA8FE90.jpeg (800.28 KiB) Viewed 3057 times
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rubber_jonnie
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Re: Old TT motherboard restoration

Post by rubber_jonnie »

@mgi Please note I've edited your post so the image is not an attachment, but inline instead.

This is as per the forum guidelines, please see this post for more detail: https://www.exxosforum.co.uk/forum/viewt ... =20&t=2357

With regards to your repairs, my advice would be to remove anything that isn't standard so that you have only a base machine to work with. It'll make troubleshooting a lot easier if you don't have to factor in additional items that you can add later once the mainboard is running again.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
mgi
Posts: 117
Joined: Sun Jun 06, 2021 4:37 pm

Re: Old TT motherboard restoration

Post by mgi »

Sorry for messing up in my post, will follow guidance next time.

As you said I want to test the bare motherboard as on the picture. Plug the power, monitor and see if there is no smoke.

Cheers
Michal
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Icky
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Re: Old TT motherboard restoration

Post by Icky »

@mgi before you fire it up I would just check there are no shorts between the 12V,5V,GND and the negative power lines with a multimeter.
mgi
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Re: Old TT motherboard restoration

Post by mgi »

That’s the plan!
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