Amoretro has an high res photo of it, and that regulator seems to be a LINFINITY LX8383A on their board.
http://www.amoretro.de/wp-content/uploads/201 … motherboard.jpg

According to this better picture that I found http://www.amoretro.de/wp-content/uploads/gig … motherboard.jpg the part is a power MOSFET FP45N03L, rated for 45A, 30V. The datasheet for the part is at http://www.farnell.com/datasheets/31009.pdf

While not a direct equivalent, I think an IRF540 could work in that position. https://www.vishay.com/docs/91021/91021.pdf

(edit) the info I posted may be for a different revision of the board, the post above mine probably has better information.

Wow, that's a quick reply!

I have seen both photos, however wasn't perceptive good enough to read the LX8383A part number. I saw the other pic with the power MOSFET as well, that is however a different revision, seems to have the power section arranged in a completely different way.

Apparently, the LX8383A can be sourced from China (haven't found it in any online store here in Poland) - will try to get one, and report back with results.

Thanks for the swift help!

stamasd wrote:

According to this better picture that I found http://www.amoretro.de/wp-content/uploads/gig … motherboard.jpg the part is a power MOSFET FP45N03L, rated for 45A, 30V. The datasheet for the part is at http://www.farnell.com/datasheets/31009.pdf

While not a direct equivalent, I think an IRF540 could work in that position. https://www.vishay.com/docs/91021/91021.pdf

(edit) the info I posted may be for a different revision of the board, the post above mine probably has better information.

Yeah, your photo was the original link I posted, until I noticed too that it wasn't Rev 2.01 but 1.56. Thankfully, Amoretro does have a lot of photos so I quickly found it.

While waiting for the proper regulators to arrive, I made an experiment (more of a redneck kludge, really) and placed a switching mode regulator module in place of the original one - connecting it's output to the board, and powering it from the 12V PSU rail. Nothing seems to have burned or exploded, but I got no reaction, other than the CPU getting slightly warm after a while. Question is - the board is missing the Dallas clock chip. Can this potentially prevent it from even trying to POST? I currently don't have any of these to test.

Yeah I think the board wouldn't boot without a RTC chip.

Got one of this model (same 1.56 revision), seems some components were busted.
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Resistor R3 is burned with all that black carbon residue and its value are not longer readable.
Seen its hires photo from webs seems to shows 2.2Ohm but not sure as third color is not too convincing.
Could someone perhaps help me to check the real value of that (R3) near Keyboard port ?
Also may someone knows what is the purpose of that resistor ?
I almost sure that some of other parts will also be dead.