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I've had the SYNC stop working twice for no reason. The first time, after checking fuses and such and not finding a problem, I just disconnected the battery cable for 10 minutes, then reconnected and everything worked again. Went straight to that the second time it happened and was back in action straight away.
Try system restore, if it fails, try to perform 32 bit dell diagnostics on the audio by booting the computer using the resource cd. make sure that the external speakers is disconnected. if still no sound on the diagnostics then you need to replace the internal speakers.
Theres a logic problem between the interface board and power supply. This is very common in Vizio's. There's a square wave start code that's not being generated properly form the processor to logic functions then power control. There's no 'read/write_code' available too ROM therefore power on/off commands are absent... this could also affect inverter control functions.
If its under warranty take it back, or have a local shop fix the tv for you.....
well it looks to me u need a new tv....all the details u give are pointing that ur picture tube is gone.....but call LG help and costumer line and ask them......u may get away from it to get a new tv make sure when u get a new plasma to extend ur warren tie to a max o 3 to 5 years and if this would happend u get it repaires for free.......cost for a new screen app 1000 to 1500 dollars
I would Initialize Unit back to factory settings by turning off main power switch then hold both 6.1/7.1 surround and direct buttons ( they are next to each other near main power switch) in while turning un main power switch. Hold both buttons until you see all lights light up. Then check functions and setup like you bought it new.
Owners manual also explains how to initialize receiver