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Turn
off the Nuvi. Place your finger on the upper left-hand corner of the
screen and then push down on the power button to turn the unit on.
Release the power button when the Garmin logo appears. Continue to press
on the upper left-hand corner of the screen until you see the
calibration screen.
Press each dot to recalibrate the screen.
Once completed the Nuvi will display Calibration Complete
You have the unit in dark mode. Press the Dim/Dark button again to get the unit to full brightness. THe unit has 3 levels of DIM. First the unit is at its full brightness, pressing the dim/dark button will dim the display and the unit functions normally. Press the Dim/Dark button again will futher darken the display but when the unit alarms the display is turned off and remain off during the alert. After the alert is over the unit waits 20 seconds of no alert to turn the display back on.
When troubleshooting these units, there are always several variables to consider. First check to see what last occurred with the unit such as did the children play video games, did the electricity go out due to bad weather. You may see that there are many possibilities but let's focus on what occurred last to the unit. Once we determine what happened last, we may isolate the actual cause of the problem. The actual cause may be associated with projection issues, older versions (Picture tube), interference from devices located nearby, and even a radio turned on and located really close to your unit. This is normally known as electromagnetic interference to electronics and is very common with the error you have provided today. Please continue to look for anything EXTERNAL to the unit before looking at the internal components. I have been working on these a long time so feel free to follow up with me.
If the unit completely turns off than there is an issue with it, if the screen dims but the unit is still running it may be in your display settings that you have it to automatically dim backlight to save power.
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.
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