BROKEN 1980s CBS ColecoVision Home Video Game Console - Trying to FIX

Hi, here we are trying to fix a broken unusual early 1980s video game console called the ColecoVision. This one was sent in by Mike from 1upGamingLimited over on eBay and it has an unusual fault. When it arrived to me it was not displaying any picture, but when Mike tested it, it was producing a horrible hissing sound.
Can it be fixed and work again like it did in the 1980s.

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Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things. I do love fault finding and trying to fix broken things, so I hope that comes across in this 'Trying to FIX' series. Many thanks, Vince.