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In Reply to: RE: Sharp 40-inch Aquos TV keeps turning itself off. posted by Dave Pogue on September 12, 2014 at 06:42:01
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.
Follow Ups:
I really appreciate your response. Here's a little more info, but I have to say up front that I'm too technically illiterate to perform the tests you suggest. I don't watch it all that much as I'm mainly an audio guy (audio system is completely separate, in another room).
The Sharp is a two-year-old flat screen unit that sits atop a stand. Lots of air circulation. Connections (mostly HDMI) to a nearly new Denon receiver, Oppo Blu-ray/DVD player, an Apple TV, a Comcast cable box and an ancient VCR. No timer. Everything works fine, no problems, except when the TV dies (screen goes black, pilot light goes off). Sound stays on, because it's provided via the Denon receiver. Turning the Sharp back on, it operates as before. Until the next time. The Sharp has never turned itself off more than once in any given day, usually after playing for an hour or two.
After this happened a couple times, I checked the entire unit for any hot spots. Nothing was ever more than mildly warm. Checked repeatedly for bad connections (including AC) and never found any.
Because the problem is so intermittent, I'm now of the opinion that it needs to get worse before calling somebody knowledgeable for help.
You may have lots of circulation on the outside but one of the main reasons components in flat screen TVs and computer monitors go bad is because they are so thin that heat easily builds up and the components destruct long before they do in larger pieces of equipment. If something is overheating inside you are not going to feel it on the back of the plastic cover.
I agree, because intermittent problems are difficult and time consuming to trace it may make more sense to wait for it to get worse.
One thing I would try in the mean time is to disconnect the cable box, Apple TV and the Oppo and play a tape (or several) in the VCR to determine if the TV still shuts off.
Also vacuum cooling holes and slots with brush attachment of your vacuum.
good luck
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