ScuzzBlog: Diaries December 2017 Entry 28th December 2017: Post: 1 The last A500 I guess I have over 35 Amiga 500s in various guises. From 500s to 500 Plus' and contained within other machines. Of all the Amiga 500 variants I have only one that doesn't work. They are a hardy breed of Amiga and so it is of particular importance to me that I get this last Amiga 500Plus working. And so we venture forth to save the last of my 500s So here is the problem Graphical issue on screen as seen So I set too checking the chips, damage and continuity of the circuits The floppy is working and there is power to the main circuits Keyboard and mouse are working The battery was removed from the board a good while ago now. My first port of call is with Denise I have already swapped out Paula Shows why you should use the IC Puller to remove chips. I checked thoroughly all tracks and they are all fine Enter a busted motherboard of unknown origin. No idea where it came from. All I know is that it was busted when I got it I checked traces all over this board for continuity and all I could find was a lack of activity to the far end of the CPU and a dodgy capacitor/resistor. I swapped over the Denise but made absolutely no difference Next stop and the fat lady I will remove the Agnus from the busted motherboard. I don't have a PLCC extractor so fingers crossed there are some big holes in the board First though remove all the port screws Man is this board rusty at the. port plate. Looks like it was left in a wet location. Probably loft or outside shed / garage. Looks like water actually got into the machine Exposes the battery damage on the doner board from below Looks a lot worse than it actually is Sadly the Agnus chip does not have any holes in the board to aid extraction so I will have to acquire the correct tool to remove More damage to the busted motherboard Corrosion seeping through here There are white tide marks next to the chip Looks too much for a capacitor. I am guessing water ingress. Could be wrong Whilst here I checked for continuity All the traces were working fine OK so I have to press pause as I wait for the extractor. I could use a small screwdriver, but in truth I would likely break the socket and they are a pig to repair. Just not worth the risk The Agnus has some strange green discolouration to the one side which I cannot explain Fingers crossed its nothing to do with U40 or U41 cus that exposes me to an Indiana Jones fear of snakes.... !! More to follow soon

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Last updated 28/12/2017

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