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RE: Sharp 40-inch Aquos TV keeps turning itself off.

Posted by mrdavis842 on September 13, 2014 at 11:58:59:
Did you maybe accidentally set a timer to turn it off?

It could be several things and there is not enough information to really pinpoint anything. Does the audio still work when the display goes dark or is the TV completely dead? It is more than likely related to a heat issue of an aging part or component. You could try putting a fan behind it, preferably with the back cover removed (and even the shield over the boards removed) to see if it still does it, to get an idea.

I would check 3 things first: the inverters, the power supply capacitors and the display lamps and their connections at the lamps.

Measure the inverters and look at the electrolytic capacitors on the power supply board. Often you can just look at them and see that they are bad, or going bad, by their swollen case and/or leakage. If they look good but, the lamps and inverters also checkout good you will need to remove them and take measurements. If one or more is bad then replace them all (on the PS board). You can probably find a capacitor replacement kit on ebay or some other website for your TV model if you do not want to buy them separately. [It could also be an electrolytic capacitor on the processor board but that is not very likely.]

If it is one of the lamps or its connections it is more than likely the one at the top that takes all the heat from the rest below it.