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If the unit is new and never been set up post installation, that's probably your problem. You have to go into the Installation Wizard and set the unit up properly. There are multiple choices of displays and scanner units to select to obtain the configuration you have. Then the radar has to be optimized (auto-tuned). If you don't have access to an installation manual and feel confident yourself, you'll need to contact a local Furuno authorized dealer or call Furuno USA tech support and they'll walk you through it. Their number is 360-834-9300
The symptom you describe sounds like a case of no radar targets. To further diagnose, put radar on the longest range and turn Gain to full, Sea Clutter to Minimum, Rain Clutter to Minimum, and observe the screen. The presence of "grass" or evenly distributed clutter indicates that the receiver and cabling is good and the radar may not be transmitting. No transmit is caused by a bad magnetron or a bad modulator in the antenna, or depending on model there is still an outside chance that the power supply in the display has failed.
Sounds like your video cable inside your radar cable. Also brings your Gain back to zero, STC back to Zero and rain back to zero. Next increase your gain until you see a picture. If none of that is working, check your cable then finally call a dealer.
You may have a faulty magnetron or one that has gotten old. They do have a life. Find out how many hours you have on the unit and give furuno a call. They will more than likely tell you what they think the problem is.