ipad air LCD not turning on after digitizer replacement

hello , i got the same problem with my i pad air 5 where screen stays black after digitizer replacement. funny thing my battery was disconnected during replacement. any ideas?

i tried reseating clips, home button and off button hard reset old digitizer also not working.

I pad is detected by iTunes and when i connected the charger the charging sound keeps beeping continuously. please advise

I think I found the problem. does any one know what this part is called and how to go about it. my soldering skills are rubbish. is it a fuse of some kind. how could this have happened if I was wearing static band and battery was disconnected.