Toshiba TP50f50

[rjgale]

i aquired a toshiba model tp50f50 and was attempting to optimize some of the service settings. i was adjusting HIT and while scrolling through the vol down key my finger sliped and hit the 0 key. the tv screen went black and i can not get it back. there is still sound but pic is black, is there anything i can do to restore the picture.