Delphi tnr800

[Dutcht]

Hello, my touchscreen went blank on my Delphi (Lux) (Y91) nav radio in my 2006 Hummer H2 SUT. The radio still works and if I touch the screen, it will change the channel but I don't know what channel I am pushing!! Anyone hear of this? I was wondering if someone knows where I can send it out to so I can get it fixed.
Thanks for your time, Dutch.