Purpose of tape/plastic tab on dock connector

Hi guys, straight forward question.

I was trying to fix a friends ipad which was displaying issues with the colours namely green/pink waves everywhere.

I took it apart hoping it was a lcd or connection problem, everything worked fine so i think its the onboard graphics or motherboard at fault.

But while i was looking i found the black tape on the dock connector was removed (where the dock connector meets the digitiser connector), i opened up a broken iPad i had lying around and noticed the small precut black tape is also connected to a small plastic see-thru chip.

So my question is does the pre-cut black tape and more importantly the small plastic see-thru chip play any importance to the device at all? namely the plastic chip (i think the plastic chip is taped to the inside of the cases rim or somthing.

Thanks.

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