There isn't all that much left ! Have you looked at the refresh rates ? Also known as frame rates or frequency. Most computer equipment to drive screens runs at 60 Hz, as do most screens but, particularly European, TV equipment runs at 50 Hz. You will also occasionally find other frame rates being used.
This goes back into history, but when TV was being developed a nice stable and standardised clock was needed. 'I know, let's use the mains frequency !'. In the UK, mains frequency, while allowed to fluctuate within fairly tight limits, is required to be be kept at an average of 50 Hz over a 24 hour period, mainly because of the requirements of electric clocks. In the USA, and much of the rest of the World, mains frequency is 60 Hz.
You should be able to check and adjust if necessary through 'Control panel - Display'.