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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
I've now found two things. First, that too-cheap HDMI cables are not a good thing. The one between my Denon Receiver and the Sharp TV has an intermittent problem and has been replaced.
Second and more important. The Sharp turns itself off EXACTLY 3 hours after it was turned on. I've now timed it 4 times and there's no question about this. I'm sure the "why" resides somewhere in the menu/software and I just haven't taken the time yet to track it down. More specifically, there is a "No operation off" function that "allows the TV to automatically shut the power down when there is no operation" and the period after which it shuts down is 3 hours. Obviously there IS operation during the 3-hour period (I'm watching the damn thing), but this seems too weird to be coincidental.
More later. Thanks for everyone's help.
Follow Ups:
Perhaps the Sharp doesn't recognize "operation" if the unit is always playing audio via an external device (the Denon receiver) rather than its internal electronics. Why it suddenly figured this out after a lot of time (maybe 2 years) rather than immediately is another question.
I still think you accidentally got the sleep timer turned on in the menus somewhere at the 3 hour shutdown point. YOu need to go thru the menus and find the sleep timer. MOST modern TVs have a sleep timer built into the menus somewhere, and 3 hours would likely be the max length other than none at all.
David
You my be right. I plan to check all this out tomorrow. The manual, though, says that the sleep timer options extend only up to 120 minutes (i.e., 2 hours), and provide on-screen reminders starting within 5 minutes of turn-off.
You're probably on the right track, clever of you to measure the times.
My plasma has a "no activity" time-out: like for no active input, receives no remote signals, stuff like that, I've never used it. Look for some feature like that, maybe under a power-saving (sub-)menu.
I can certainly see this feature for a watt-sucking plasma, but I guess even for a LCD it saves a bit of power.
Unlike the sleep timer, which requires "planning", this is for when you forget to power off, or pass out.
If you make a SINGLE channel change and back during the three-hour period, does the TV still shut down at EXACTLY 3 hours from when it was originally turned on, or is it 3 hours from the point where you made the channel change? I need a stopwatch to diagnose this one.
Apparently the "timer" starts over after the last remote input. This is pretty much only for TV's (built-in tuner), rather than plain displays.
A display with this feature would probably call it something like "no signal shutoff", it would *not* be looking at remote control signals to trigger, just the A/V input signal.
Whether sleep timer or no activity shutdown, mine displays warning messages starting 15/5 minutes before shutdown, then every minute in the last 5. I don't use these features, haven't for a very long time, so I'm unclear on the exact details.
Now that I think of it, it would make sense that any kind of shutdown timer display these messages. So if you're not seeing them, it's probably not a shutdown timer, unless there's something built-in that's totally non-defeatable (doubt that, that would limit the display's application).
Could there be some kind of store/demo/etc. mode in effect that you have to cancel? Mine's a Pio Kuro so you know it's at least 5 years old, and I vaguely recall I had to turn off some kind of mode the TV was in when first received (new). You could only do this once without getting "advanced". It might make sense that some initial non-defeatable shutdown mode be enabled, without messages so it doesn't "scare" customers when it's on display. I'm grasping here...much easier to judge when in front of the gear...
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