Is is possible to damage monitor by connecting wrong frequency signal to it ?
Remember that a monitor is just a glorified TV? Well, one of the design constraints of real TVs is that they have only a single horizontal frequency and only a single vertical frequency. This simplifies the hardware design considerably: the horizontal deflection uses a tuned circuit to create both the deflection frequency and the high voltage required to run the tube. This circuit is comprised of a transformer (the line transformer) and a condenser. Run a line transformer even fractionally off its intended frequency and it will run much less efficiently and use more current, which gets converted to heat. If you run a conventional monitor off spec for any length of time, it will burn out the line transformer. It would have been very well possible to build protection electronics agains this kind of use, but the need for price have caused that such extra circuit (which would increase the price of monita a little bit) are not usually built into monitors.
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