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Sounds like it's the mobo on the television...If it's still under warranty, a manufacturer's warranty should cover it as it's considered as a defect in the television. Contact customer support about it, they should be able to solve you issue by either repairing it or getting you something new.
When viewing on Digital TV:- Sometimes Audio and Video signal can not be transmitted simultaneously due to additional process time for the video signal compared to that of the audio signal. Often video signal takes more time than the audio signal to convert from analogue signal to digital signal in the Digital TV. It may result in mismatch of the picture and sound. In the TH-G30/40's HD AV Sync menu, you can adjust the audio signal delay for simultaneous AV signal transmission
1. Delay time can be varied in 10msec steps.(0 to 300ms) 2. Delay time is different between TV Brands.
So you need to adjust the delay time for correct lip-sync. The adjustment is listed in the instruction book page12
You need to look and see if the 24vdc feeding the backlight inverter board disappears when the screen goes black, if the voltage is OK, then the problem can be the backlight inverter baord, it is either bad or not getting the ON signal on the ON/OFF pin from the main logic board. http://www.shopjimmy.com/catalogsearch/result/?q=Vizio+GV42L+
After reviewing the service manual for this set, the problem is is in the DIGITAL BOARD. To get the right Digital Board you will need the Version number of the TV.
If your getting your signal via a satelite receiver or HD cable box, its likely that the sound dropouts and picture freeze are the result of marginal signal strength. Does the TV ever do this when using a DVD player? If not, its certainly the quality of the signal.
If the TV is at fault, the problem will be on the digital board.
that is possible
the home theater has so many in puts on your dvd and out puts.
there is a way
1 you can buy a vedio/audio converted to rf signals, this will mean both signals entering tv using rf.
2 get your vedio out from dvd and audio out, feed that to a converter, vedio in and audio in okey
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