power keeps going off 42 inch hd vizic model number l42hdtv10a

Sounds like power supply problem typically caused by low temperature capacitors with marginal voltage rating. The capacitors which are cylindrical will look inflated or may even have leaked. A tech can repair this or a new board could be installed. If the caps are replaced I would suggest 105 degree instead of 85 and at least half more than the existing voltage ratings.
A replacement board if available will not have the upgrades but would be easier for you to install yourself.
 

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