Well , the situation is I just wanted to look for my HDTV Samsung 37b530 overscan option in service menu but somehow putted My PC Calibration to FAILURE and tried factory reset after that but its no use ,I dont know why i did it though .
But it's finally fixed by a checkerboard pattern.Now somehow video image quality is little brighter and unsharp than b4 ( not sure ,maybe spent hours tried to fix calibration strain my eyes). Does the factory reset effect original setting that cause the problem ? I'm pretty sure I didnt touch other options
But it's finally fixed by a checkerboard pattern