My elite ti 9 when on sonar presents a jumbled up picture.it scroles but also has a partial bottom picture on the same screan

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Sounds like one of the pins on the cable from your transducer is bent where it plugs into the back of the unit. check that first, then ensure the plug is all the way in. If it's not that, it's possible a wire is broken in the cable. You could try the wiggle test. With the unit on, have someone watch the screen and wiggle the wire that you can reach working from one end to the other. if the screen flashes or changes while you do this in a certain spot, there's your problem. This kind of problem usually comes from the wire being tight where it goes around a corner. Heat and vibration will finish the job