1984 RCA FJR2010T - Light Dependent Resistor

[zeno]

Ditto Old Nut.

I never had one fail. This is a great set. Lost a lot of sales on them til Zenith came out with a cube. They were famous for cold joints in the tuner / micro boards. See if it routs through them.
BTW IIRC to go into video you need to press "91" or something like that.
Maybe JohnCT will pipe in. He knows RCA well.

Zeno

Originally Posted by old_tv_nut

Check if turning off any automatic color setting also disables the light sensor.