No LCD screen image (just backlight) external ok worked twice

I have a problem with my MacBook Pro 13 late 2011 model a1278

It was working fine, I needed to change the glass from my display because it was cracked, easy fix, but while changing it I damaged the lcd itself, so I changed that but damaged the lcd cable so I changed that also

I have now gone through 3 lcds and 3 cables but it still doesn't work for some reason

I have had intermittent success, meaning twice everything worked perfect while I was just checking to see if it worked, but I tried connecting it again, didn't work, what I normally get is just the backlight on the lcd working, but no image

I should also mention that the external display works fine

Any help or fix on this issue?