Its an in dash on, my 1753 Triton Crappie boat. When I tried turning it on, the back light just flashes 9 times, then goes off. I pulled it out of the dash and checked all connections, including fuses and wires to battery and wires to unit. Dont know if unit is going out or transducer is bad. Never had a problem before. Where can I start to trouble shoot? I tried to push the up arrow key while turning it on, but nothing, just flashes 9 times again, then nothing....thanks for any suggestions....