Bir 7D için de benzer duruma şu yanıt gelmiş

If it shows no sign of life at all, after you have put a new battery in, ie nothing on the top lcd display, it is usually a tiny fuse on that pcb which is just below that top lcd display. It is a component which is soldered onto the pcb and is usually white, approximately 2mm x 1mm and designated by a small F or a number on it. Not really a job for a novice diy'er to repair as you have to dismantle a lot of the camera to acces it. But certainly repairable. I have repaired many which show no signs of life at all caused by this very reason.