MFD/DVD issue

Hello Everyone,

I tried to look everywhere, but did not find anything specific to my issue.

I have a 2007 gen2 Prius, with navigation.
My problem is, that like half year ago the right side of the MFD buttons are "not working" at all (Menu, Dest, Map): when I press them, the screen goes either black, or black with white lines. The right side works perfectly (so Display, Info, Climate, Audio).

I checked with and without the DVD, the issue is there. The DVD looks absolutely fine. I checked also the connectors to the dvd under the driver's seat, and they look good to me, I cleaned them too with contact spray, but still nothing.

I'm wondering if anyone had this issue so far, and how was it fixed if yes.

Thanks in advance,
Samu