Fish finder not working

Maybe some 1 can shed a bit of light on this 1 for me.
I have an Eagle seachamp unit and on monday the fishfinder went on the blink,all i,m getting is is coloured screen and is stuck at reading 1.2ft

sonar.jpg

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Process of elimination I would reckon. Firstly check all connections. See that it will run in simulator. As the screen looks OK I would reckon you may have transducer trouble. Maybe try your head unit on somebody else’s tducer or try another.