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There's 3 issues I see that have varying degrees of difficulty to fix.
Easy. You may be able to improve the sharpness of the picture adjusting the TVs fine tuning control.
Intermediate. The snow in the picture is probably dirty contacts in the tuner. To fix it that you'll have to disassemble the set enough to get to and remove the VHF tuner shield then spray the moving contacts with tuner cleaner and rotate the channel tuning knob several turns in each direction.
Hard. It looks like the horizontal deflection circuit is intermittently failing and coming back. This requires soldering skills, troubleshooting skills and circuit theory knowledge. If the horizontal stays collapsed for too long unobtainium parts can be destroyed.
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