1986 Curtis Mathes with built in radio.
 

I have a 1986 Curtis Mathes with a built in AM/FM radio. I was given it several years ago. It worked fine till i moved 5 years ago. The picture went out. Now it makes a humming noise when turned on. The radio still plays.When you you push the button. Channel lights up. I know you need a digital tuner. Still does not work.Hums in all modes. It is a 26 inch stereo floor console.

1986 would be all solid state, I'd imagine?

It is.

Tube does not light up.

Almost all makers dropped hybrid color after the 1975 model year (though GE continued selling the nearly all tube portacolor until nearly 1980), and hybrid monochrome sets were tapering off around that time as well.

If it's humming.... wouldn't it be filter capacitors?

Possible. By the mid 80s most sets used 17KHz switch mode supplies for everything....granted if the big filter cap across the bridge Rectifier that rectifies the power cord input is bad it could be introducing enough hum to the 17KHz switching transistor it powers to swamp the switch mode B+ output regulation with hum.

Disclaimer: any set made after 1980 has zero value to me so I never fix them and always part them out to fix older stuff. My repair knowledge of these is theory and reading rather than first hand.