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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://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary..
Jan 13, 2012 - Uploaded by Clay Whitehead
TV Has Sound But No Picture Troubleshooting Guide - Duration: 2:30. by Repair.com 472,733 views. 2:30. LG LCD TV REPAIR -NO PICTURE ...
It sounds like bad luck to me. You cannot change any settings on a TV by connecting a computer to it. In theory you can damage any monitor by setting the screen resolution of the computer higher than the monitors maximum res. The Sharp 26" has a resolution of 1366 x 768 (1080i) so (again in theory and I have never seen it happen) if you set the output to 1920 x 1024 (HD - 1080p) it can kill the screen. Perhaps this is what has happened. You will need to take it to a Sharp service centre.
Is the power light staying on? If so press imput and menu together for 5 seconds to see if the set will blink a 2 digit repeating code. If that doesnt work. Check for CRT coolant leaks on the boards. This seems to happen alot as do faulty capacitors. Coolant leaks will be located on the chassis directly under the tubes they can cause corrosion and prevent your set from starting especially in the VS models.