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Yes, there are service menus in most if not all FP sets and CRTsets.
My 1990 Sony XBR had a service menu that was accessed by holding down a hidden button while powering the set on. Everything from Gray Scale to Pincushion was set though the menu.
My Panasonic Plasma has one and so does the Sony LCD projector, accessed by pressing key buttons on the remote and then powering up, both of them have the ability to see how many hours the set has been on, and also the number of power ups, useful if you are thinking about buying a used one.
Even a cheap little 2002 Samsung 14" set has a service menu, although limited.
The danger is that you could adjust something like the Horiz frequency so far off you won't be able to see the picture to undo the mistake. Fortunately most of them require a step to "Save" the settings before you exit, if you just pull the plug it goes back the way it was.
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