A friend of mine has this happen to his Raymarine chartplotter
. We were in the bay of Naples, far from our base in the south of France
. His wife had found repair instructions on the web for this display trouble. I helped him in disassembling the complete chartplotter
contacts, especially the flat cable contacts between the different stacked electronics
plates. We put everything back together and voilą, screen came back to life. That was about 6 years ago and to this day the chartplotter is still going strong.