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I've been working for a few days to restore an Amiga 3000 from 1990 which was owned by an art professor from Philadelphia.
Part 1: https://mstdn.io/@codewiz/113561527808236797
Part 2: https://mstdn.io/@codewiz/113562074864354876
TL;DR: The Varta battery leaked concentrated potassium hydroxide over the vital region between the three chips which define the Amiga architecture: Denise (video), Paula (audio) and Agnus (blitter, copper and DMA).
Extracting Denise and Paula reveals some corrosion on the pins.
Fat Agnus appears to have been spared, but I don't have a proper PLCC extractor tool and I'm not going to risk prying it out with kludgy methods.
Against best advice, I took the risk to power up the board in its present state.
The power LED flashing 6 times means that the Kickstart's diag routines failed somewhere, and a red screen signals a ROM checksum failure:
https://www.amigalove.com/viewtopic.php?t=324
This is actually great news: the 68030 was able to execute some ROM code and even write into some of Denise's registers.
The checksum error could also be caused by a fault on either the data bus or the address bus.
@codewiz La Varta ti ha mangiato tutte le piste. Hai visto pure sotto gli zoccoli? Ma devi avere una buona stazione dissaldante ad aria altrimenti sfasci tutto specialmente se provi a dissaldare il chip Agnus(sono sicuro che questo lo sai gia')
@Ermanno Ermanno?! Wow, come stai?
Domani vado all'Artisan's Asylum per usare i tools professionali e farmi dare una mano dagli esperti. Vedrai che ce la farò a salvare questo Amiga 3000.