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press the bottom left button scroll to preferences select change the contrast settings to fix the screen issue exit to menu again and select advanced menu, select system settings - and then you can change the auto off timings
it turns out I inadvertently adjusted the screen contrast. This is adjusted by holding the left arrow key down after powering up, until the contrast is corrected. If the screen was completely white, holding the right arrow key down after powering up would bring contrast back into balance.
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!
I spoke to Garmin Support about this issue. There are 2 settings for contrast on the nuvi 1300. You need to set the contrast while it is plugged into the vehicle, and also while it is unplugged from the vehicle. The reason for the 2 settings is to save the charge of the battery while it is not plugged into the vehicle or power source.
The only place to get that screen is through a Furuno authorized dealer. The unit is sealed and gas filled to remain waterproof. You're best bet would be to send the unit in to Furuno for repair. You wont save much doing it yourself because the cost of the screen makes up most of the cost of the repair. They will also make sure that all the software is up to date for the new WAAS satellites that recently went on line.
Have you tried adjusting the contrast? On that model I believe you tap the power key while the unit is on and you will see 2 sliding scales on the screen, one for brightness and one for contrast. Up or down arrows select the scale and left or right arrows adjust it. If the contrast and brightmness aren't tied into the power key on that model, they're somewhere in the set up menu.
If adjusting the contrast doesn't help then the screen has most likely failed. This is commonly caused by old age, however repeated exposure to extreme heat or cold can cause premature failure.
Try tapping the power key while the unit is on. This may activate a control for contrast and brightness. Otherwise it's in the settings screen. Try looking at the screen in bright sunlight it may be make the screen visible enought to see the settings.