@persia
Unfortunately, that's not always the case, as retarded as it sounds. I've had two that wouldn't handle 50Hz RGB, a Samsung 171MP, the other was a Sharp Aquos (can't recall the model #). The PAL market variants of the 171MP did handle 50Hz RGB no problem. :/ Really bummed me out at the time, as I figured there shouldn't have been any difference between them. Looking at the repair docs, I recall there being some significant change with the circuitry on the NTSC 171MP.