a good day for all; I have a LG brand LG lg 42lb580t model that I was brought, and being with the lid placed works an approximate minute and is left with black screen sound, when the lid is removed or uncovered works all day, and no image is lost. For fovar I request a help, thank you and good day. check the voltage that comes to the led out of the source and the plug that leads to the led in function is 157 volts, I have not proved any led strip, pienzo that if it was a serial strip all the time dark the screen, put a fan in the micro and also the screen is darkened with sound, I am unsettled with this intermittent damage, there are times that works 8 hours and does not darken the screen, there is if I need an SOS help, thanks