Marine Electronics Questions? Ask a Technician for Answers ASAP
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When the backlight gets dim, check the power supplied voltage at the Raymarine device's power terminals. See if it has gotten low.
If it hasn't, then you have a problem internal to the Raymarine device, with the backlight or the support circuitry for the backlight.
How old is the Raymarine E120 in question ?
I was thinking that testing the power under load, as close to the E120 as possible, would be best.
But test the power generally in the outlet the E120 is plugged into, if that's what you can get done.