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There could be few reasons that tv does not power On. Power supply board got fried, deflection section got bad if its rear projection tv and if its dlp tv, lamp could be dead etc. Model number and brand of your tv will show us what kind of tv is that to provide you some helpful info about problem.
a tv has two components, firstly a power supply produces high voltage to trigger a line transformer, in turn a transformer produces smaller voltages. firstly check if the ht is constantly been produced from a supply, if this is there than go to a line transformer, and check voltages at the output.