Posts: 7090
Location: Northwest Chicago Burbs | I sent this thread to a tech support guy I have worked with in the past at Lowrance. Though he prefers that I do not share his contact information with the public, he did authorize me to post the below response to the problems you are all having with this particular problem. I hope this helps:
The problem here, seems to be a bit of misinformation. While we cannot rectify the problems with people being able to get through since we are in our busy season, I can understand the frustration.
However, when looking at the thread, one statement puts all claims listed here to rest:
my lcx 20 of the front does the same thing when I hook it up in the back.
This alone rules out software, since the LCX-20 utilizes a different version of software, yet does not have the issue until mounting it on the back position connectors. This tells us there is something going on in those connections; in my experience, I have seen this stem from having an older paddle wheel or temp sensor, which utilizes the MY adapter cable. This cable has three ends; 1 that is the actual sensor, one that has a blue connection that plugs into the back of the unit, and a grey one that plugs into the transducer (these are all interchangeable between the LCX25 and the LCX20).
I have recently rectified this situation with a consumer who had installed the LMS 520 on his old blue connectors, which was using a sonar port connected paddle wheel/temp sensor. This “M-Y” cable had went bad, creating a distorted sonar screen that looked identical to what they have listed in this forum. My first question to this gentleman would be “Are you using a speed and temp sensor that is plugged into your Sonar port?” and if so, recommend he replace this outright. I have started to see this screen issue arise in users who do not want to take the time or effort to replace old items when upgrading to newer items. In this case, he is using a standard 25c or 20c, but gets the same thing going on when comparing either unit in the back position, so we need to look at what’s going on there.
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