RCA XL100 portable with a dark screen

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Hello. I am new to working on Tv's, but I have a few years experience working on vintage audio gear, so I know most of the principles. I need some advice on this RCA portable tv I got for free. The tv powers on, and I can see snow, but there is no light coming from the tube. I have messed with all the controls and have had no luck. The flyback transformer sounds normal and the tube is certainly getting voltage, so I'm not sure what to do about this issue.

Thanks for any advice!