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For the movies, only the cabinet design would matter. Plus, for the movies, the chassis has to be modified to run at 24 frames per second to match the film cameras. There are also many reasons why a TV picture will not photograph well, so it was usual to fake it in the past with an inserted film image (which was also hard to do well and could usually be spotted easily). With current computer graphics techniques, going to the trouble of duplicating the guts of an old set is strictly not worth the effort for a movie production. A picture that looks just like a TV when shown in the movie can be created in the special effects lab.
There was a documentary on how TV works on cable a few years ago, and in one part of the documentary they showed how they used electronic image inserts to create an image in the documentary (how's that for recursion?). The scene was a remote pickup of an auto race, and the monitor was way too dark to show up in the same scene as the race itself - so they created an image for the monitor screen, and actually panned and zoomed it in sync with the documenting camera so it appeared perfectly to be played back on the monitor.
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