Asj

I was startup a switching power supply. Unfortunately a high voltage pulse originated and damaged my AD2. A few years ago I damaged another AD2 in a similar way, and now I have two similarly damaged AD2s. I hope that only the high-voltage protection parts (e.g. transil) or voltage converters burned up. Symptoms: 1) The device is not detected by USB 2) The green LED on the AD2 does not blink. 3) The device appears to be quite dead. Please: 1) Suggestions on what I should check first. 2) Information if there is a company / person who repairs AD2? Thank you in advance for any help :-)