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Samsung UN40B6000 service menu settings

does anyone know how to reset the service menu settings in samsung model # UN40B6000VFUZA TV? i was trying some of the settings and the one that i cant turn back on to the original setting is the one under
(  service menu-then control- then sub option- then SUB U-COM  then on-off ) this TURNED OFF the screen and i cant get it back on.. is there a fix or a way to reset  the service menu? I'm sure buying a new main board is an immediate fix correct? but is there a more practical way to make the setting appear again?