Reviving a Dead Macintosh Classic

Old leaking battery, battery holder, and old capacitors.
The leaking battery, battery holder, and some of the capacitors later replaced from the logic and analog boards.
Mac Classic showing a checkerboard screen.
Checkerboard pattern upon startup. This is the pattern after pulling the daughterboard showing only the onboard memory.
Close up of the Macintosh Classic logic board showing damage.
The area of the board the battery acid leaked from the battery. One can see how poorly some of the vias are looking; it turns out a total of 9 were bad; the whitish one in the center to the left of the ‘BT1’ label, two in the center-top near the ‘B’ label, and the 6 in 2 rows just north of the UA2 chip in the picture. Also note the disconnected Y1 crystal to the far right, which fell off during my testing.
Mac Classic showing the “Welcome to Macintosh” system 7.1 startup screen.
Behold!
Mac Classic logic board with several repair lines added.
The now-working logic board, complete with replacement lines. The blue bodge wires were needed to get it to boot, the yellow ones were added later to get the serial port to work.
Mac Classic showing the Afterdark Flying Toasters Screensaver
Totally worth it for the flying toasters alone.

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