I do not break them open and make repairs. That will be a Humminbird situation. I can trouble shoot the matter to see if it is something simple like a connection or a bent or missing pin ect.....
Sometimes it is the simplest of things and then sometimes it is just time to upgrade.
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it's all coming together and we have you covered @ Shut-Up-And-Fish LLC
for all your Humminbird, Minn Kota & Motorguide needs
We also stock the LiftSaver TM Bracket 972 822 9285