Touchscreen not working but display still working normally

Hi! I have a Inspiron 15R with touchscreen. About an year ago it stopped working. Sometimes it still gets to answer my touch but 99,9% of the time is does not show any response. Please, does anybody know anything about this issue? I wanted to attempt to reseat the display cables and see if I get the touchscreen back. Display works normally as ever. I have an Ubuntu 20.04 and have tried older and new versions to be sure it wasn't a driver issue. Thanks for reading my question. Fábio