If it was me, just saying! I would undo whatever you had done to make the freq counter come on with the echo switch. Basically start from scratch. When I had this issue with the freq counter display going blank, I discover some open circuits between the components of the freq counter board and the board itself. I re-soldered some of the pins in the back of the board. And I had to add some jumpers where I questioned the board traces. The display came back and hasn't failed since but I was still questioning myself if I should do more soldering on the board, but since it was still working I figured I will leave it alone until farther failures occur. This was my experience anyway. I hope you get it working either way... these galaxy can be a frustrated, that I know!