Check to see if you have power to unit if so pull plug the power plug off the back of unit to see if the prongs in socket is ok if all looks good sounds to me you got a bad key bad..repair shop or time for a new one
SOURCE: proper set up for lowrance sonar
Where do you use your boat?
There are so many variables it's hard to fit it all here, but there are some excellent tutorials on the Lowrance website. The most important thing is to pick the right frequency, for the depth of the water. (200khz for less than 70', and 50 khz for greater depths). Depending on how serious you are about fishing, there are a lot of extras that you may never use. The key is to figure out which features will help you the most and forget about the rest.
You may also get some help at this link: FixYa Service Directory
It's common for SONAR to lose contact with the bottom at high speeds. The better the transducer installation, the faster you can go. Turbulence and bubbles will cause the SONAR to drop out. Lowrance's transducer installation guide explains it very clearly.
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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