Hi Grossel
My TV (and my computers) work fine on a modified sine wave inverter. My longest test runs being about an hour and never a problem. ... the outputs of my inverters seem to power things fine, including the cordless phones wall wart supplies. While during a power failure the longest they would normally run on inverter is less than ten seconds before my generator is online, I have never had a problem during test with the modified sine from my inverters.
Ron