The chief editor of the French website lapastenague was also one of the numerous Time Capsule owners who has seen this device dying after 15-18 month of perfect service.
TEchnically, it is not complicated as the TC unit only requires only 5 V and 12 V lines. He has been using the PSU of an old external HD, and via a Molex and some soldering adapt it to its defective TC.
