imac 2015 without retina backlight

Hi

got this device, not working, found a short in the mainboard near usb. replaced this all working fine.

Checked everything, all good. toke the display off and install the glue stripes. put display back without gluing for last test and... no backlight!

checked connector get 69V and with flashlight i can see the display. on mainboard the last led is not turning on.

did someone had this problem, I dont know what could be here the reason

Some mechanical damage.
Check for any ripped off component, damaged connector...

the LVDS Cable was damaged ! replaced it and the show can go on. so if anybody comes to the same problem, case is closed