Quote:

Warning: The SM is a dangerous place. Be careful what you change and please write down original values before changing.


I think that deserves to be repeated, in bold. You really can make a mess in TV service menus and it can be very hard to undo if you haven't correctly noted down all the original values. In the case of my Toshiba there isn't any "reset to how it shipped" option either...

The first time I used the SM on my Toshiba I clearly wrote down a wrong value somewhere. It took me weeks of fiddling to get it back to a decent state.
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Remind me to change my signature to something more interesting someday