Finding schematics for consumer electronics is very difficult to impossible, and for something like a consumer digital camera the chances of you finding them are virtually 0. Only thing I can suggest is take a GOOD long hard look at everything you can see, clean it up dust it off start from the power connector and work your way through everything you can disassemble, be meticulous and through, and even then there's still a decent chance you won't find what's going on, or you could find it immediately.
Watch for bulging capacitors especially in the power supply section, you said you checked a fuse you found but keep an eye out for scorch marks anywhere else.