Bad tuner?

I have a magnovox model #RJ5540-AK01 that only picks up snow and no
sound on all channels. The cable connection is good (from a sattelite).
Set initially had only black raster, but now has decent brightness
since tapping on CRT neck board. The rear A/V jacks give a perfect
picture and sound. I suspect a bad tuner, but how can I determine if
the tuner is bad, and is there another suspect compenent I can check. I
am a beginner and have only been working televisions for about 1 year.
Thanks group for any suggestions.

.

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