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I am having similar problems with backlights on my lowrance graphs. turns out there is something messed up with the networking. When i turn on the front graph it is dim, when i try to make it bright it dims the back graph. when i try to make them both bright one of them always goes dim. not sure if that is any help, but if anybody knows of a fix for that i’d be a very happy guy!
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Backlight Synchronization
The Backlight Synchronization command will keep all display unit
backlight levels consistent across the NMEA 2000 network. So, if you
set the backlight level to 75% on one display unit, all other units on the
network will automatically switch to the same setting.
To turn on/off Backlight Synchronization:
1. Press MENU|MENU, select NMEA 2000 and press ENT.
2. Highlight BACKLIGHT SYNCHRONIZATION and press ENT, which will turn
on/off Backlight Synchronization.
3. Press EXIT repeatedly to get back to the main display.