solder-bridge at ribbon-connector?
Your photo is too fuzzy to tell if there is a trace connecting the two pins.

One thing is certain:

If your tablet/monitor ever worked correctly, then this bridge isn't the cause of your problem.  

That bridge didn't spontaneously appear.  It also didn't just suddenly start causing problems.  That bridge looks to have been there since day one.

You need to look elsewhere for the cause of the problem.



Bridges like that form between pins that are close together.  They most often form between pins that are connected together with a short trace.

The manufacturers usually have the processes well enough in hand that you would only get bridges on places where you want them.

Mistakes do happen, it would usually cause a larger problem than the subtle error you mention.