Iphone 6 backlight

Hello, please help to solve my case, have changed almost all backlight circuit parts:

– backlight coil
– diode
-u1501

When if was removed checked lines to lcd, cathide anodes all come.

Also accoirding to ground measures all backlight pins on logic board, tgere is no shorts, missing resistences.

Already tried several ics. Software restore, nothing helps.

I have second such strange backlight i6, has anybody faced with such problem??