Camera works.. but not quite

I obtained this 60D (from ebay) as not working, actually it was sort-off operational but screen wouldn’t come on and it wouldn’t communicate with Utility app (the app started but it couldn’t recognize the type of the camera). The LCD, top buttons and shutter work, but it seems it can’t save the image to memory card (the red LED goes and stays ON..

I opened the back cover (most of screws were missing) and it seems someone tried to do the same but gave up at this point (?).

Anyway, based on symptoms described above, would I be right to conclude the main board is faulty and it would be OK to replace it (I have it from another one which works OK, apart from broken shutter)?

Thanks in advance,

Bojan