That's the great thing about older tech like Amigas, you can keep them running. When a modern PC dies, what can you do? Nothing. But with an Amiga, as with other machines of that age or older, you can repair them. So they'll still be going in ten years, easily!
Not so fast! What about A1200s and A600? Their motherboards are the same as peecee motherboards, because everything except the Kickstart roms are surface mounted, and most of the chips are the ones with those tiny pins. Just try to repair that.
If some caps break, then you'll be able to change these on a peecee motherboard easily enough.
Bottom line: It's mostly the same kind of technology, and what you can and can't repair relies purely on what's broken, and whether or not you have the skill to fix the problem.