We need a dab more info please.
By "wobbles" are you refering to geometry problems or is the display itself falling apart?
My guess is you are seeing a skew on the top part of the screen.
Toshiba's convergence/ geometry are input specific. Hence the DVD input is simply set up better than the cable/sat input.
Without actually seeing it (a picture posted by you would help alot) I hesitate to go much further.
Good Viewing,
Doug k
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