i searched posts on three sites and could not find this one.
i got an older extreme. had f/f installed with kayatank had foam peeled back and gooped to inside under front hatch. nothing but black vertical lines on f/f when i tried it in bay. had transducer reinstalled and took it out to la jolla yesterday (1st time, what a blast) got same problem. i tried manual sensitivity at 80%-no black lines but all i got was temp which seemed right, depth which would jump around from 18 feet back to 110 feet out at kelp and the rest of the screen blank. i know i was over a huge amount of macs cause i would drop my sabiki about 40 feet and come back with 4 or 5 every time. this is what the screen looked like. any comments would be greatly appreciated.