Marine Electronics Questions? Ask a Technician for Answers ASAP
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Approximately how old is your FishFinder unit?
Did the unit suffer any damage?
Are you planning on carrying out any repairs yourself?
Ok, first check the connections from the main board to the display screen to ensure they are securely connected.
If the display cable has come loose it can cause lines on the display.
If a loose display cable is not the cause of the problem then the display screen will need to be replaced.