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Garmin Dēzl 780 LMT-S screen went black

My Truck GPS screen went black but the tuch screen still working.

First i tried to increase the brightness but it didn't change anything.

Second thing i did was updating my GPS but it didn't solve the problem.

Third solution i drained the battery completely and recharge it again and still didn't fix the problem.

Last thing I did factory reset and still the problem.

Any solution please.

First picture with flash on so you can see what I'm talking about 

Second picture is how the gps look like without flash on