Hi @Maciel1, sorry to hear about this. 
I have translated your question to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
Have you tried the troubleshooting that is available on our Support website? You can find a link with some troubleshooting steps below.
https://support.sonymobile.com/global-en/xperiac5ultra/faq/system-&-performance/i-cannot-power-on-my...
Let me know how it goes!
