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Fault with its main 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.
My 47" LCD Smart T.V. was working fine last night. I got up this morning and I have sound but no picture. The VIZIO icon lights up as usual but I get no picture, only sound. From the time I turned it on, nothing appeared on the screen. I have already tried unplugging it for a while and still nothing.
Ur convergence it dead.Buy a convergence kit,replaced what in that kit.Know how to solders right?Buy a convergence kit in these websites Tv repair World.com,Tv rpair Kits.
Convergence ICs are STK392-110 you will need two of them they are available at the link I am posting and they give free instalation instructions with pics and free tech support so you can do the repair yourself.Heres the link. http://servicemanuals.vstore.ca/
Most settings and configurations except the Parental Lock could be reverted to factory default by doing a full hard reset. This is done by simply unplugging the unit from the mains for a couple of hours (or overnight preferably). If done and the system/TV will do a reset, all your settings (color, brightness, program selection) will be back to normal (or factory default).
Most parental Locks works with a code or password. Unfortunately, often this requires the use of the original remote that came with the TV.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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