Top of digitizer unresponsive iPad mini 1st Gen

Hi, I've had a search for people describing similar problems but no solution found for this one.

I have replaced the digitiser on an iPad mini 1st Gen following the iFixit guide closely, however approximately the top 5th of the screen is unresponsive to touch, below this the touch screen functions fine.

I have had a look at the digitizer socket which has no missing pins, also cleaned these incase there was some dirt obstructing the connection however the same problem occurred.

I have tried 2 different digitizers which have exactly the same problem. Have ordered a 3rd from a different supplier to see if it is a problem with the digitizer.

Would really appreciate any advice on this one, anyone had a similar issue?

Best regards,

Joe