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  1. On my old HTPC through VGA, when Windows put the screen to sleep (disabling output to the cable I suppose), the TV would say "No signal" for about 10 seconds then put itself to sleep (so that I didn't have to turn the TV off).

    Now that I've replaced that old HTPC with a new one that outputs through HDMI (v1.3 Full HD, video+sound, all I need), now when Windows puts the "screen" to sleep, the TV persistently says "No signal" and will not put itself to sleep. Even overnight it'll stay like that. I can't tell exactly how Windows (10 now but 10 and 7 for the old HTPC) handles disabling output for HDMI or VGA cables... and I can't tell if what's keeping the TV from sleeping has to do with Windows, the cable, or the TV.

    TV screen sleep also doesn't happen with the DVD player composite cable connection when the DVD is powered off (with it on, it just shows its manufacturer logo, but regardless the DVD player times out and powers itself off after about 10 minutes of inactivity). With my PS4 HDMI connection (in any port), when I put it in Rest Mode, the PS4 will disable output to the TV but the TV will stay in No Signal Detected forever. I'm having trouble finding anything in the manual on how to get the TV to just put its screen to sleep when there's no connection after a while. Even just 10 minutes of telling me No Signal would be fine if it would just Go The F To Sleep.

    Anyway, I haven't tested every possible combination with every device I own, but my guess is there's some setting I have to trigger to get it to sleep after timeout of no signal, I'm just not finding it in the manual, and my remote's OK button stopped working long ago hah so it's tricky changing settings until I fix that or replace it.

    Have you run into this on any of your TVs? My TV is Samsung, an old Series 5 (550). Is there something about HDMI or VGA or composite etc that determines whether TVs can tell when to go to sleep or not?
    Last edited by vidahera; 3rd Aug 2022 at 11:39.
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    My 2015 Samsung smart TV has a feature called "No Signal Power Off" that causes the TV to turn off if there is no signal from the currently selected input/device for a user-specified period of time. It is under MENU > System > Eco Solution

    Otherwise... HDMI includes the ability to turn a TV off/on via CEC (Consumer Electronics Control) when a connected device is turned on/off. Samsung calls its version of CEC "Anynet+". Unfortunately, few PCs provide a way to allow CEC to control a TV. Composite video doesn't provide a way to signal a TV to turn on/off on its own.
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  3. I did find the AnyNet+ option in settings, and all it had was enable/disable, and a feature to turn off the PC when the TV turns off, which is not what I want, but doesn't work anyway.

    I went through every page of the manual (85+), and found nothing about the TV screen going to sleep for any source, VGA or otherwise.

    It appears the TV software just only works right with screen sleep through its VGA connector. This seems like either a bug, a design flaw, or a feature oversight, so now I need to figure out if I can get any software upgrade to make screen sleep work sensibly.
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    Originally Posted by vidahera View Post
    I did find the AnyNet+ option in settings, and all it had was enable/disable, and a feature to turn off the PC when the TV turns off, which is not what I want, but doesn't work anyway.
    That is no surprise. Very few PCs are able to use CEC.

    Originally Posted by vidahera View Post
    I went through every page of the manual (85+), and found nothing about the TV screen going to sleep for any source, VGA or otherwise.
    Your TV was probably released before Samsung added the energy-saving "No Signal Power Off" feature to its TVs.

    Originally Posted by vidahera View Post
    ...so now I need to figure out if I can get any software upgrade to make screen sleep work sensibly.
    TVs and monitors may look similar but TVs are not monitors and monitors are not TVs. TVs usually lack some features that monitors typically have and monitors always lack many features that nearly all TVs have.
    Last edited by usually_quiet; 4th Aug 2022 at 11:12.
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  5. I still would like to know what the difference is with HDMI and VGA when it comes to a TV knowing when to sleep from "No signal".

    While my HDMI PC cable is v1.3, I've read that some of them don't have a "sense wires" or something... which I'm not able to find info on yet.
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    Originally Posted by vidahera View Post
    I still would like to know what the difference is with HDMI and VGA when it comes to a TV knowing when to sleep from "No signal".
    HDMI can be connected to many devices that are not PCs, for example, game systems, cable boxes, satellite receivers, audio receivers, streaming boxes, Blu-ray players, and DVD players.

    On the other hand, I can't think of any devices that would use VGA to connect to a TV other than a PC. Since VGA on a TV is a dedicated connection for PCs, this behavior was probably an intentional choice on the part of Samsung's engineers, not an accident.

    Originally Posted by vidahera View Post
    While my HDMI PC cable is v1.3, I've read that some of them don't have a "sense wires" or something... which I'm not able to find info on yet.
    The only pins that later HDMI versions use that HDMI 1.3 doesn't use are the pins assigned to ARC (Audio Return Channel) and Ethernet.
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    Many modern devices have the "sleep after x minutes of no signal" regardless of input type. But if yours was prior to that becoming common, there is not much cheap that I can suggest. There are switchers that can do CEC or a blank screen for you, but they are commercial grade ($$).

    Scott
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  8. @usually_quiet

    > Since VGA on a TV is a dedicated connection for PCs, this behavior was probably an intentional choice

    The manual treats a PC connection from VGA and HDMI the same way... as a connection from a PC. It states nothing about no-signal screen timeout. The behavior between VGA and HDMI in relation to screen timeout is inconsistent. I don't see why that would be an intentional choice; why would a Samsung engineer want the screen to timeout with VGA but not HDMI? Would you want that? Why would you want screen to not timeout when HDMI signal is disconnected? I'm just trying to find a logical basis and conclusion for your assumption... could it be that maybe there's something different about HDMI that makes the TV think it SHOULD stay awake during No Signal from HDMI indefinitely?! If so, I'd like to know that detail... maybe I need to post on an HDMI forum...

    > The only pins that later HDMI versions use that HDMI 1.3 doesn't use are the pins assigned to ARC (Audio Return Channel) and Ethernet.

    I think you're talking about numbered versions greater than 1.3, not certain cables of versions 1.3 that have some extra pins or something. I'm using version 1.3, I don't see any reason to use a greater version because the TV is not 4K and has no extra features through the connection that I care about. I was wondering if there were certain sub-versions of HDMI cables of version 1.3 that had something extra that I needed to hunt down to tell the TV OK GO THE F TO SLEEP.
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  9. Originally Posted by Cornucopia View Post
    Many modern devices have the "sleep after x minutes of no signal" regardless of input type. But if yours was prior to that becoming common, there is not much cheap that I can suggest. There are switchers that can do CEC or a blank screen for you, but they are commercial grade ($$).

    Scott
    That doesn't explain why the TV goes to sleep after seconds of showing "No signal" from the VGA connection. So the feature is there, but for some reason doesn't happen with HDMI connection (or composite connection either, incidentally).

    If it's the HDMI cable's fault, which type of version 1.3 cable do I need to get?

    Also, the screen won't sleep with any of the HDMI inputs regardless of which device is connected... this is just a giant mystery to me now.
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    Originally Posted by vidahera View Post
    @usually_quiet

    > Since VGA on a TV is a dedicated connection for PCs, this behavior was probably an intentional choice

    The manual treats a PC connection from VGA and HDMI the same way... as a connection from a PC. It states nothing about no-signal screen timeout. The behavior between VGA and HDMI in relation to screen timeout is inconsistent. I don't see why that would be an intentional choice; why would a Samsung engineer want the screen to timeout with VGA but not HDMI? Would you want that? Why would you want screen to not timeout when HDMI signal is disconnected? I'm just trying to find a logical basis and conclusion for your assumption... could it be that maybe there's something different about HDMI that makes the TV think it SHOULD stay awake during No Signal from HDMI indefinitely?! If so, I'd like to know that detail... maybe I need to post on an HDMI forum...
    You need a different TV with the "sleep after x minutes of no signal" feature. I don't think there is much chance that an update will make your current TV behave like a monitor when it is connected to a PC via HDMI.

    I don't think the "sleep after x minutes of no signal" function existed in ye olden days before smart TVs. Most people either had to turn off their TV manually or set the TV's sleep timer to turn the TV off at a specific hour.

    Originally Posted by vidahera View Post
    > The only pins that later HDMI versions use that HDMI 1.3 doesn't use are the pins assigned to ARC (Audio Return Channel) and Ethernet.

    I think you're talking about numbered versions greater than 1.3, not certain cables of versions 1.3 that have some extra pins or something. I'm using version 1.3, I don't see any reason to use a greater version because the TV is not 4K and has no extra features through the connection that I care about. I was wondering if there were certain sub-versions of HDMI cables of version 1.3 that had something extra that I needed to hunt down to tell the TV OK GO THE F TO SLEEP.
    Technically, a version number always refers to an HDMI connection and technically, HDMI cables should be rated for "speed" or bandwidth instead.

    It is very unlikely that your problem has anything to do with the cable. TVs only have Type A HDMI connections. All Type A HDMI connections have the same number of pins (19) and the number of connected wires should always correspond to the number of pins. If some pins are not connected, you have a defective cable or an exceptionally crappy dollar-store cable where the manufacturer cut corners to reduce costs by not connecting pins that were not yet assigned a function.
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  11. Use a smart power strip that will automatically turn off other outlets when the device on the master outlet is turned off (or enters a very low power state, ie, sleep). For example:

    https://www.amazon.com/Sunbeam-Advance-Outlet-Strips-Protector/dp/B07K3ZLMP7

    Some have an adjustable master threshold control that lets you specify how low a current causes the other outputs to switch off.
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    Also, to be clear, the HDMI pinouts have not changed, in designation or in number, since v1.0.
    Yes, speed and features have changed, but that is in the protocol & signalling payload, which is basically determined strictly by the chipsets/programming logic of sender (source) & receiver (sink) devices.

    It may not be consistent with your outlook on how devices should work, but I find usually_quiet's supposition that it was an intentional special feature put in at the time by Samsung's engineers to be pretty plausible, and I have seen plenty of inconsistencies between various ports' features on displays. Witness that a device can have 2 HDMI ports, with one labelled "HDMI1" or something, and the other labelled "PC", "HDMI2 (PC)" or similar, and it is not uncommon to see the PC input automatically have 1:1 pixel mapping, but the standard HDMI input(s) NOT, where they will need to have the zoom setting manually modified to get the equivalent.

    Scott
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    From what I have been able to find out on my own using a search engine, TVs, in general, don't have the ability to enter a reduced-power sleep or standby mode as monitors do. Instead, the TV either remains on, or if it has a "No Signal Power Off" feature, and that feature is activated, the TV turns itself off if the timer expires with no signal present.
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