Error 21 don't fix after battery remplacement


I've got an iphone 5 who got the error 21, the battery was already changing.

The error came after a update to IOS 8.1.3, the phone is in recovery mode only when is connected to an USB (PC or power socket), if i unplugged the cable, the screen became dark.

So I try to change the battery another time, I put a new battery, but it is always the same problem, i retry in Itunes i've got again the error 21.

It is the motherboard HS ?

Thanks to your help, and if you want more details please ask me.

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