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Why don't I have a video signal on my Sharp LC-49D68UT ?

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Fault at its main digital 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. Pull up older posts. http://electro-medical.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.

Posted on Dec 31, 2016

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HCDZ Replacement Remote Control For Sharp LC-70LE732U LC ...

https://www.amazon.ca/HCDZ-Replacement-LC-70LE732U-LC...LC.../B00F3ZFA6QHCDZ Replacement Remote Control For Sharp LC-70LE732U LC-46LE830U LC-70LE733U LC-80LE632U Smart AQUOS PLASMA LCD LED HDTV TV: Amazon.ca: Electronics.

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