Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.
SOURCE: TV TURNS IT SELF OFF AND ON I HAVE A LG 42'' MODEL 42PC3DV
You have a bad start relay in the power supply Replace it
SOURCE: ive a 42inch plazma lg tv what is the code for my
Hi,
You can find the codes and instruction how to set the remote for your LG tv
http://www.skyuser.co.uk/tools/SkyRemoteTVCodes.pdf
Thanx
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