I have done that several times without effect
No just from digital aerial.I have 3 other Samsung TVs working from the same Aerial through a booster set with 5 outputs. I have changed the faulty one onto one of the others but no change.
I can not do any more at the moment as | am at work but can try again this evening if you have other likely answers
I thought it may be that. I will go through the procedures you have suggested again and will let you know