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There are two main causes for symptoms like this. Usually people replace the TV but it's actually much cheaper to fix.
1. The Power Supply. Just like computes, screens and tvs have a small power supply inside, usually directly connected to the power cable. Sharp can get you a replacement power supply under $100 and you can put it in yourself with a screwdriver or have someone do it easily.
2. Ask an electrician to check out the main capacitors (or if you know how to use a voltage tester, just be sure to unplug the screen and hit the power button a few times first to discharge) If you find a faulty capacitor, they're usually under $10 to replace.
Most likely one of these pieces is getting overheated and shutting off, causing power to fail to the rest of the TV.
Also damaged capacitors can cause a slow dieing effect to the display, from what I have seen during my research efforts to find solution for repairs to computers people have bought to me. I have only seen "dead" display lcd monitors that have repaired ok by replacing the $1 capacitors.
Most likley there are some bad capacitors that need to be replaced in the power supply, in particular the ones that are "10 volt" types. As a tech...I LOVE to see these sets and or//power supply boards come in as it is "easy and quick money for me" and a quick and lasting repair for the customer. A decent shop should be able to repair your PS board for under 350, in home service.