Prior to dropping the game pad was it doing this behavior you mentioned? If not, something might be broken inside the game pad which would probably be the Digitizer.
@justlost Here is a replacement LCD and Digitizer screen assembly and a guide on how to replace the LCD and Digitizer. If it turns out that replacing the LCD and Digitizer display assembly does not solve the problem then you can return the LCD and Digitizer display assembly and get your full money back.
Wii U GamePad Screen
Remplacement de l'écran LCD du Wii U GamePad
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