JVC HD-52G787 Turns itself off

You can try a hard reset: Unplug TV from AC mains and remove all cables from TV. Wait about 30 minutes and replug to AC power and redo the cabling. Switch on the TV and see if it works.. If this did not work then relocated the tv and make sure that you give enough space behind the tv to dissipate heat ,if the blue led comes then then it could the problem with heat sensor activating the tv to turn off there changes of dust accumating in the tv try to clean the dust and connecting back and check it it works ...

Good luck...

Bad news Sal I had the same issue with a vizo it is a bad board if you can take it back and get a new one if not you need to take it in to a shop sorry

This is overload/fault protection to prevent further damage. How long have you owned the television? I would suggest having a professional service the television as repairing it yourself could lead to further damage.

http://maps.jvc.com/cAscList/
follow this link and you can locate the nearest service center and inquire about an estimate and repair. If you need further assistance let me know, also please take a moment to accept and rate my solution accordingly.
Thanks,
Lee

Its the problem of power supply board in your tv and has to be checked with a meter on the main board and faulty components has to be replaced to make it work.