Share your experience!
Hello
My Z1 is only Working fine when it's permanently connecting to the
power cable.
Without the cable it starts but turning off right after a few seconds.
Already changed the Battery,fixed the Software using Xperia comparison and reset für phone also.
Whats the Problem?
Thanks!
did a official service center performed the battery change? if not please send your device to your authorized local service center Local support
Hi @Horstmen, welcome to our community!
I am sorry to hear about your phone. 
Based on the troubleshooting you have already done on your own I agree with what @nolramlb suggested.
Your device will need to be examined at an authorized service centre by a trained technician. Your Local support team will arrange a repair for you and answer all questions that you may have regarding local service routines and so forth!
Keep us updated!
Hello
Had a chat with the german support.
Need to send the phone to a service centre.
After 2,5 years that's pretty odd.
Had my first Sony Walkman die about 14 years....
Thanks for the update!
Glad to hear that they were able to help you with having it sent to an authorized service centre.
I really hope that everything works out with the repair so you can enjoy your Xperia phone again!
Keep us posted!