Why are some TV boxes unable to display on LCD monitor?
Some LCD models cannot handle the higher refresh rates that some set top boxes put out (Example : Samsung), and some TV boxes do not have the capability to switch from 50Hz to 60Hz. The refresh rate is just around 50Hz. (Example: 49.9Hz) the monitor not display. Typically, the display will function normally only when the refresh rate of the TV box is higher than the LCD.