Ne screen after battery change

Hi,

I had a battery and ear speaker problem on my Xperia Z. I ordered the spare part and change them this morning. Everything went fine. The battery was a bit hard to take out.

I reassembled everything, boot and.. no screen Backlight is ok. I can hear the boot noise, but nothing no touch, no screen !

I try to reset, repair with Bridge on mac. Bridge said everything went fine but... no screen.

Any idea what's wrong ? A problem with the screen flex cable?

I can see copper in some place : https://www.dropbox.com/s/8osv4dst6p36af...