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Thread: Amiga 4000 Repaired!

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    johntayloruk's Avatar
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    Feb 2019
    United Kingdom
    West Yorkshire
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    Default Amiga 4000 Repaired!

    Hey, just thought I'd do a post for a project I've been working on thanks to having lots of time with the lockdown.
    I bought a non-working Amiga 4000 Motherboard on ebay, it was filthy, corrosion on many of the resistors, the battery had gone to work and had eaten its way through to the rear. I didn't want to even turn it on in the state it was is so I gave it a clean with white vinegar and IPA (my word the amount of fizzing and fishy smell...yuk ).

    Anyway, I've had an ultrasonic bath I've been wanting to try for a while so I removed the caps and socketed chips and gave it a good soak. It came up like new and I could then see what I was faced with...

    U177 (74HCT174) had pretty much been eaten away, hardly any pads remained and there were traces broken all over the place., particularly around the memory sockets going through the vias to the underside of the board.

    The traces from the row of resistors around R982 to the jumpers at J975 were completely broken and had to be repaired.

    The F245 chip at U891 had also been damaged and had to be replaced. Again that fishy smell when you get underneath...yuk!

    Anyway....after many hours testing traces, re-flowing most of the board, replacing the caps and adding new simm sockets I turned it on only worked! I was so happy to see that WB 3.1.4 screen/ I did a full check with Chucky's Diagrom and all was ok. I used some solder mask to cover things and to secure some of the connections in place (probably too much), but it's working fine now!

    I've had 10 of Chucky's A3660 boards made up so my next job is to put one together and then likely look to sell this as I have another original A4000 as well as a new one I've just made up!
    Attached Thumbnails Attached Thumbnails 09.jpg   06.jpg   05.jpg   04.jpg   02.jpg  

    032.jpg   083.jpg   071.jpg   A3660PCB_1.jpg   A3660PCB_2.jpg  

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