hummingbird 77c

[bob f 57]

hi guys
i have a matrix 77c i was fishing the other night sounder working fine all night,
anchour up switch of sounder then switch back on for the trip back to the ramp,
and all i can get on my sounder screen is grey lines have attached a pic
has anybody got any ideas as what the problem could be
thanks
bob

[Angryant]

I had a similar issue with my HB 931C a couple of weeks ago. I removed all power to the unit (switch off unit, turn off at switch panel and turned off battery isolator switch). Then reversed the process and it worked fine again. Hope it works for you.