Possible back light problem

i broke my phone recently for the second time.....first time screen broke...got the parts fixed it, was all good.......this time it was the touch screen that cracked...and a little while after it went black....didn't think much of it and ordered the parts......

I've replaced the screens over but still no display, i held it up to the window and saw the screen faintly, so i took the screen off the phone (still connected) and i could see my display when it was held up to the light at an angle..... is this the back light? and if so is there a way to fix it?