First, follow the wire from the fuse to the unit. It may be pinched or cut somewhere between those two points. Seems simple, but this happens often. If the wires look ok, You could also try a fuse one size bigger. If it blows that fuse, then the problem is in the unit, and you will have to sent it out for repair.
SOURCE: lowrance x135 not functioning properly
Had the same issue with another brand. Turned out the transducer cable was picking up noise from other cables (power, trolling mtr. etc). Try moving the transducer cable away from any other cables. I put the cable in a 1/4 " plastic housing up to the point where it was above deck and it stopped all the strange stuff. Not sure about the temp issue??
SOURCE: Our lowrance x135 just quite working Its less than
Here is a manual for it. http://www.lowrance.com/upload/Lowrance/Documents/Manuals/x136df_0151-171_112003.pdf ,
Take it to a major marine outlet, they generally have access to experts who fix this type of equipment
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