Facing TV Problems? Ask a TV Technician.
Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, bear with us; re-confirm and post back with the complete model number of the "...Lg 3d led lcd..."
Appreciate the additional information and for allowing me time to search the model number references to compose this reply..
For test purposes, can you please unplug the TV for an extended period of time. Then plug back in but into a different outlet.
Please post back results / observations of the above once tried.
It would appear that the TV is kicking in auto-protect mode; an internal hardware issue.
Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter (and even perhaps a soldering iron)?
I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround; sorry for having to be the bearer of bad news.
Please click HERE.
And thank you for your kind understanding, repairs are needed.