My Garmin Nuvi 780 had been working fine for a week, and just yesterday when taken off the window mount while still on the screen went black. When try to turn it back on the screen remains black, it will make noises if I touch the screen when turned on. Help! is there anything I can do? I'm afraid to do anything, I don't want to hurt it..
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You must have installed a PIN code when you first set it up. If you can't remember, then take it back to the security location and it will automatically unlock, and you can reset the PIN. If you purchased this privately rather than from a dealer, there is a chance it is stolen. The PIN is the security feature of Garmin GPSes.
Worked for me but not sure why, I had the same problem of freezing when updating Bluetooth firmware on a Nuvi 770. I chose to reset all user data (press lower tight hand of touch screen while powering on) and next reboot it updated firmware sucesfully. No idea why this worked.
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.