Grey flickering sections of display, progressive failure.

I recently bought a secondhand iPad 6th gen WiFi only, all was well for about a month.

After this time a grey patch covering exactly one quarter of the screen from the Home button upwards started to appear for short periods of time (a few seconds) and would then disappear leaving the display normal again. All touch functions worked still, if I knew where to touch behind this grey patch. The patch is not solid grey, but seems to flicker a little as if the graphics controller is still trying to send a picture…

Unfortunately over the space of a week or so the 25% grey patch became more frequent and for longer periods. Sometime it would extend to halfway or even 75% of the screen… and ultimately I now have a iPad with a completely grey screen that is almost permanent, (sometimes I can see the Apple logo for just under a second when I first switch it on from being completely off. I can power it on and off because I can guess the location of the “Swipe to power off” button.

I have not much clue as to the cause, I have opened the unit and re-seated the screen connector to the logic board, but this does NOT appear to affect the issue even momentarily.

Is it possible there are some chips not secured to the board properly as in the iPhone 6 problem I read about on this site?

I don’t have the ability to repair solder issues on the logic board so would also be interested in finding a good iPad repairer in the UK… that or information on the issue. Has anyone else even experienced it? I am not seeing much online that is similar.

Hope you can help me.