The remote control labelled BN59-01311B from Samsung is generally compatible with many Samsung TVs, including the QE77S90D and the Q9FN. - Compatibility with QE77S90D: Yes, the BN59-01311B remote control can be used for the QE77S90D as Samsung's Smart Remotes generally work with most Samsung TVs. - Compatibility between S90D and Q9FN remote controls: Yes, the original remote control of the S90D can also be used for the Q9FN, and vice versa. Samsung's Smart Remotes are often interchangeable, especially if they are both Smart Remotes, although some functions may be limited. However, it is important to note that some specific functions may vary depending on the model, but the basic control functions should usually work.