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A list of the capacitors can be found here on maccaps.com. Parts can be purchased on Mouser, look for Nichicon or Panasonic SMD aluminum electrolytics. Don't do the repair in the way shown in the linked image though, use surface-mount parts for all of the caps unless you absolutely have to use...

Caps are definitely suspect if there were static noises. I believe the LC PDS has its own line for sound so that might explain why the IIe card audio works but the motherboard audio doesn't.

The schematics for several 68k's, including the IIci, were discovered recently:

Pretty unlikely there's electrolyte on the mobo given that the SEs are all axials (never heard of these leaking).

The leakage on your board surprisingly doesn't look too bad  :) . I used to have both an LC and an LC II and the audio regions of both boards were pretty much destroyed.

Yeah, the CPUs in the G3s and Yikes G4s were a BGA G3/G4 and a couple of cache chips on a ZIF carrier. AFAIK Apple never produced a 500MHz G4 ZIF since only the Sawtooth's and up came with 500MHz parts and those used a different connector for the CPU card. Of course, there are probably some...

@Gorgonops If I'm not mistaken, the board you're describing is one of the listings eBay recommends after the linked one is sold. The one the OP purchased doesn't come with a CPU at all, and unfortunately G4 ZIF's don't seem to be very easy to come by (at least on eBay).

The Yikes should have a ZIF socket for the CPU, just like the B&W G3. The first board is (I believe) an MDD board, and the second one is for a Digital Audio G4.

Are you sure the internal speaker itself is good? Also, I wouldn't be surprised if there's some trace damage around the audio circuit given that there are some electrolytics near the sound chips and the speaker jack. After looking at the schematic, I'd recommend checking for continuity between...

The G4 motherboard in question comes from the "Yikes" G4, aka the PCI Graphics model.

The conformal coating over the patch wire looks pretty neat and tidy. I'm definitely trying that out the next time I have to run a jumper.  :)

It sounds like the drives may be misaligned. I've been lucky enough to not have to realign any drives so far, but I'm pretty sure you need an oscilloscope to do it.

The Classic II has a different analog board than the SE/30. The tubes themselves are swappable too but the yokes are different. Edit: Johnnya101 beat me  ;)

Ah, I see. Nice job getting it running!

Correct me if I'm wrong, but I'm almost certain that if you're getting a normal startup chime, the connections to the ROM and RAM are good. Maybe it's a VRAM issue?

Nice! That screen looks surprisingly sharp for a passive-matrix display.

I wonder if it's an encoding error. This chart shows the Mac OS Roman and Unicode hexes for every character. The Unicode hex for the acute accent is the same as the Mac OS Roman hex for the yen sign, which would explain part of the difference between the valid header and the invalid one.

The Portable doesn't have a CRT/analog board. (I guess this should be in the 68k PowerBook subforum)

Washing the board and changing the caps would be a good first step. Portables are known for having bad caps.

A small dab of hot glue near the solder joints (but not on the solder joints) works well to anchor the patch wire down and prevent it from being ripped up.  D5 and D6 are MMBD914 diodes. They can be purchased here.