Bricked phone

Hi everyone! I bricked my Xperia Z1, I tried flashing stock rom, pc companion, Emma tool nothing works. I sent it to Sony repair centre hoping they can flash it back for me but they claim that it is a hardware problem and I need to replace the mainboard which is so expensive I could afford a new phone with it. Any solution? Appreciate your help!

The phone is able to boot, but not able to charge. I can see the Sony logo, then it boot over and over again but it cannot charge.