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Electro Mavin (mavin.com) sell replacement new unused Optrex DMF-50174 Displays units for $25.00. Order one. Take small screws out of the back of the Northstar 951x and carefully remove the cover, disconnect the old display unit (just one ribbon, one power connector and two screws). Replace the display with the new one. Replace cover and screws. Now take your loved ones on a small holiday with the money you just saved yourself!
If the unit is under warranty, then send it back to the manufacturer. I had one customer that had the same thing happen and the manufacture offered to replace her unit free of charge.
If the unit is out of warranty, the manufacturer will not sell you a replacement screen. You can find them on eBay, but unless you know how to take the Nuvi apart, you face damaging the unit further.
If the touch screen is bad, the Nuvi will not recognize any presses on the screen. Having worked on many of these units, there is really nothing to go bad on a touch screen unless its physically damaged or has become disconnected from being dropped. If it appears that the glass is cracked, then it is the LCD display that is bad. The touch screen is a clear film layer that lays over the LCD display.
I would strongly suggest that you purchase a Garmin friction mount and no longer use the window mount. With a friction mount, your Nuvi will not fall and the friction mount is legal in all 50 states, whereas a window mount may not be.