Happened to mine several years ago and had to send it back to Raymarine for repair. Now it has happened to all of my st290 displays and they say they no longer repair this series. Hope they still will repair your 120. I would call service center to see if they still repair before sending out. It was very expensive flat rate repair. FYI if they will not repair there is a marine surplus store over here in Fort Pierce that has a new one
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