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Turn it on picture there a few seconds later screen go’s black sound o

Turn it on picture there a few seconds later screen go’s black sound o

Every time I turn on my LG model 55LB700V ,the picture comes on for a few seconds (not long enough to get into the settings menu) and then screen goes black, everything else working ,like sound can turn it up and down, can change all the channels ,can’t see it being the screen lights, as the picture is there every time I turn it on ,(and it looks a very good and strong picture) is there any way to reset it to the factory settings,as it doesn’t stay on long enough for me to get the menu up on the screen to go to settings would be great full if you could give me some advice regarding this problem (seems to be a common regarding the screen going black ,but as I said my LG tv dose show a picture every time it’s turned on , thanks and kind regards Chris G

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