S4 mini turned off suddenly and it won't turn on

Hi to all. I have a Samsung Galaxy S4 mini GT-I9195 that I use for work. Some days ago I was reading some E-mail and it turned off like if I removed the battery and it won't turn on.
I tried everything, also connecting JIG without any change.
I connected to my PC and it has find this device "QHSUSB_DLOAD" but I haven't the driver installed.

What is happened? Is my device bricked?
What can I do?

Thanks in advance.

Inviato dal mio SM-G920F utilizzando Tapatalk