Sega Genesis won’t show on tv.

I’ve used this Genesis on this same tv about 2 years ago using the rf unit with no issues. I wanted to see if my daughter would be interested so got it out again but the video was mostly static. I bought an rca cord for it and tried again today but just getting a black screen with a kind of humming noise. Took the unit apart to clean but didn’t see any signs of damage.

I tried to attach a video of each cord. The static one is using the rf cable and the black screen is rca. Any advice would be appreciated.