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β02-15-2023
10:18 PM
(Last edited
β08-08-2023
10:07 AM
by
SamsungCaleb
) in
My 27" FT45 monitor (LF27T450FQNXGO) goes into sleep mode and wakes up when it's supposed to. But while in sleep mode it will repeatedly turn on for a few seconds and back off. Continuously and regularly maybe every 10 seconds. What's on the screen is just what it was when it went to sleep; nothing changes there.
What's turning it back on? I've been turning the power off to make it stop at night or it will do this all night.
Thanks!
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β06-26-2023 06:59 PM in
Monitors and MemoryIt does sound like the one you pointed to is more likely to help (if any will). Mine is a switch that I don't does any negotiating. It's worth a try.
I never even thought about the blank screensaver idea. Good idea. It will keep the monitors from sleeping and saving energy but use should be minimal.
Thanks!
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β06-27-2023 10:42 PM in
Monitors and MemorySeems like this is an established problem with Samsung monitors across multiple models, so that sucks. For those tracking this issue, this is happening on my Viewfinity 34 inch (S34C502GAN) with an M2 MacBook Pro 14β connected using DisplayPort from a usb c dock. I have multiple other connection methods at my disposal, so will update when Iβve experimented a bit. However, the real fix is probably a firmware update from Samsung, and itβs disappointing to see thereβs no response from them here confirming the issue.
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β06-27-2023 11:12 PM in
Monitors and MemoryCan confirm the issue appears to be either with DisplayPort on the monitor or some DP specific technology in my case.
I tried the following connection methods:
1. DP (dock) to DP (monitor)
2. HDMI (dock) to HDMI (monitor)
3. DP (dock) to HDMI (monitor) via AmazonBasics converter cable
I only observed the sleep mode loop on first configuration.
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β06-28-2023 12:43 PM in
Monitors and MemoryIn my case it is HDMI > HDMI.
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β06-28-2023 08:59 PM in
Monitors and MemorySo I continued trying a few things. I swapped out my MacBook for a windows laptop (2018 HP Elitebook x360), and tried my various cable options again. It works the same as the MacBook, with DP > DP connection being the only one with the sleep loop issue.
However, as I was connecting things up I noticed something else. My HP laptop battery was completely drained and wouldnβt power on initially, but the monitor started cycling through no signal/sleep as soon as it was connected. Note it stops cycling when the dock is disconnected from a computer.
So at the very least that confirms this issue cannot be fixed through any OS-specific power settings, but also is rather confusing. If not the computer, what on earth is reviving the signal on the monitor?
So now Iβve tried a few really stupid things. Back with my MacBook since itβs not OS specific, I connected the computer through a non-thunderbolt USB-C cable that cannot carry display information. This triggered the sleep loop on the monitor.
Then I tried plugging a normal USB-C to Lightning cable into the thunderbolt port on the dock and didnβt put a device on the other end, and the loop started on the monitor again.
So hereβs my slightly educated hypothesis: With very little knowledge about how DP and HDMI actually work, but moderate knowledge about electricity and some other digital standards, I think the monitorβs own signal is getting reflected back at it and the firmware is too stupid to figure out itβs talking to itself. The monitor probably sends out a signal every few seconds to check if thereβs a device on the other end. When that signal reaches the terminus (computer, or end of a lightning cable I guess), depending on the hardware, natural resistance in the setup, type of cable or whatever other situation, it gets bounced back and the monitor thinks itβs something, but it gets no actual data and goes straight to sleepβ¦ until it pulses out another check.
Tldr: nobody but Samsung can fix this issue, and I suspect they wonβt on current models, but some iteration of their firmware down the line probably will
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β06-29-2023 01:49 PM in
Monitors and MemoryThat's really interesting information. Thanks for doing all that testing! Not that I can do anything with it but I would hope Samsung would at least admit the problem and fix it.
FYI, I'm using HDMI to HDMI on a Win10 machine. So it's not DP but if it is something happening with the cable terminus (how that might happen is beyond me) I wonder if the cable plays a part. I will look for an older HDMI 1 cable in my spare parts and see if that does the same thing. I can try other connection types, too.
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β06-29-2023 03:17 PM in
Monitors and MemoryI think itβs particularly telling that I could reproduce the issue without connecting any device through the dock. Changing any component in your setup including cable, hdmi switch, etc. could have an impact. For instance Iβd be surprised if my DP to HDMI cable allowed the problem to occur since itβs a one-way converter cable. I donβt know enough to suggest an actual solution, so good luck finding something that works with your machine!
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β06-29-2023 03:31 PM in
Monitors and MemoryYes. I think I'll try a few things. If a converter solves the problem as you say (not that that's necessarily a desirable solution) it would be in line with the suggestion of using a splitter made earlier. Maybe. If I learn anything I'll report back here.
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β07-11-2023 10:46 AM in
Monitors and MemoryHello all,
Iβm having the same power problem with my 34β monitor. The connector is USB-C converter to DP port on monitor. So looks like with DP, you can boost the refresh rate highest, but will be a problem with the idle power wonβt stay off.
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β07-17-2023 07:24 PM in
Monitors and MemorySame issue here with my new Odyssey G40. Connected HDMI to HDMI.
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