Zenith SY2031S TV "electric house fading" Questions

can not pick up uhf frequencies and only 3 channels from vhf During a storm the electricity to my house cut on and off which turned the tv on and off. Since than i can not get a clear picture with the

...was "pumping out excessive voltage", way beyond normal limits. He said that instead of using the electrical house ground, it was using the cable tv coax to ground. What would cause a television