No sound from Color Classic

Hiya. I've got a Color Classic, very used. Sys 7.1, 6 megs RAM, 80 meg HD (remember when that seemed huge?)
It has no sound. None. At first, it had a muted sound, but now even that's gone. No sound if I plug in an external speaker or headphones either. I've opened it up and checked the connections on the speaker, and it looks good all the way thru.
I suspect it's the main board (with the external plugs and all), so I suppose I'd have to replace that if I manage to come across another CC (or maybe just exchange one for the other), but I'd like to know if there are any other possibilities, some simple thing that could be out of whack that I somehow might have missed.
Thanks

Brett
Given that you haven't missed the front-panel sound and brightness controls of the CC (the harbinger of things to come on some of the later AIOs), you may have analogue board problems. Although on-board capacitors had gone through a couple of generations by the time of the CC, even the newer types are 14-odd years old now. The audio of AIO 68k Macs is highly sensitive to capacitor degeneration, for which the sole remedy is replacement of the capacitors. Replacement CC analogue boards are getting scarce, so repair is likely to be quicker. Washing the logic board can often make a considerable improvement to capacitor-induced problems on that board, but the logic board is where the better capacitors fail less often.
Colour Classics can be upgraded in various ways. The first, when one is running, is to maximize RAM by replacing the 2 x 1MB SIMMs with 2 x 4MB. (There is 4MB of soldered-in RAM.) The CC will, however 'see' only 10MB of the resulting 12MB. VRAM can be doubled by adding a 256kB SIMM, and a 68882 maths coprocessor (FPU) can be added, if you do enough number-crunching to need one. In this state you could put an Apple IIe-emulator card in the LC PDS slot. If not one of those, a 10Base-T Ethernet NIC in that slot. The emulator cards have gone from USD10 to USD40 on eBay in the last couple of years. The Apple II ware needs a 10MB partition of its own, on say, a larger HDD of about 500MB as another upgrade.
The second kind of upgrade is to replace the logic board. There is already a forum devoted to Mystic, Takky and other hacks of CCs. If you go this way you will not be able to use the Apple IIe card.
Apple IIe; 15 x 68K; 7 x PPC; 5 x G3     System 6.0.8 to OS 10.4.x

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