Very often is a relative term, and it is also dependent on what type of television you have (ie CRT "tube" or projection vs LCD/plasma). If you mean "flipping channels" every commercial break where some broadcasts are in SD and some are in HD, no, there's no meaningful harm.

If you mean having a weird signal issue with your satellite or cable box where it flips between HD and SD signals 100 times a second, yes, that might cause an issue (I've never heard of such an issue, but hypothetically).

If you're changing inputs and have to press a physical button to do so, like an input selector to go from composite to RGB to HDMI, the button will probably wear out long before before the channel/signal tuner will. The signal tuner is basically all solid state, so other than electrical surges or the EMP burst from nuclear weapons (in which case you probably aren't worried about you TV), there's not a lot that will harm it.
Source(s):
Having taken apart most of the electronics I've owned, knowing how signal receivers word (buy a TV tuner card for your computer some time, a similar thing in cobbled into your TV). Years of using an HD tuner as described without issue.


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