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Spare parts delivered and soldered back to the board.
Cleaned and reseated the socketed ICs...
...and slowly turned the power switch 
"We have picture!" (tm, Sorin Electronics)
#amiga
#a3000
#vintagecomputing
#retrocomputing
#batterydamage
#restauration
#electronics
@trebroNdotnet Woohoo, congrats!
How stable is it? Mine boots, but crashes frequently.
@codewiz So far, so happy - AmigaTestKit and DiagROM showed no errors. Amber is working, clock recalibrated. Had some issues to get the SuperKickstart Disks working - as I had no experiences with the kickstart 1.4. Further tests necessary, but its promissing so far.
@trebroNdotnet Is there an Amiga repair playbook somewhere with a list of signals to check for common faults?
I'm still investigating those vertical lines every 16 pixels, the ROMs checksum failure (red screen) and *all* the ZIP slots failing ziptest.
@codewiz Unfortunately not. It only helps to proceed systematically: Are the voltages from the power supply stable? Does the error pattern change when you put pressure on Paula, Denise and Agnus (PDA). PDA - does heat or cold cause changes? I have learned a lot from the repair section on a1k.org. Register there, write 5 posts and a world of repairwizardry opens up... I only stand on the shoulders of giants :-)
@codewiz Sometimes it helps if you reseat the socketed ICs. The PLCC ones are hard to take out. The plastic of the PLCC sockets becomes soft or brittle. Apply pressure on the sides? Anything changes?
@trebroNdotnet The Artisans Asylum has a PLCC extractors, and I also bought one myself.
I'll try extracting Gary and Ramsey and cleaning the pins with the fiberglass pencil + isopropyl.
Would be good to get on a videocall to compare the bus signals. See also my latest posts on the reset logic.