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Actually I don't think this is a power supply issue, the problem is in the main board, test the 13 volt rail on the main board that feeds the audio section of the set , there will be a star that identifies the various test points on the boards, look for the one that has 13 volt by it, if I remember right its at the bottom left side of the main board, I think you will find it starts out at about 8 volts then drops off as the TV shuts down..There are safety circuits in the power supply that shut down if any of 4 voltages are either to low or high and I think that is what is happening. To fix it your going to either need a new main board or you can replace the audio output IC...chances are if you look at it you will see it has bulging. Good luck!
Now tv is on,u have a picture only few sec.and faded away and have audio left only?Yes then the tv have 2 long board call LCD inverter boards are dead.These 2 long LCD inverter boards help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those 2 refurbishes long LCD inverter boards for the replacement.Tv is newly bought?Return it right away for an exchange for a diffrence new one.
hello, sounds like a capacitor blew inside possibly your power supply was fualty or the capacitor that blew overheated and cuase the sound its typical noice a capaciotr makes when it blows.. hope this helps
I w having this same issue when watching a Blu-Ray disc. I found it to be dependent upon what picture mode the TV was set to. By this I mean certain picture modes would cause the TV to dim during dark scenes of a movie. Changing the picture mode helped a lot.
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