Check to make sure the transducer is hooked up correctly, and check the actual transducer for signs of damage. Transducers are fragile, and a good whack can break the crystal inside. For more troubleshooting, here is a helpful link with the Owners Manual for your Humminbird.
http://store.humminbird.com/media/document/PiranhaMAX_150-160-170-180-190c.pdf
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