Ghosting on screen

[Haswellx86]

In my college there are some labs with these crap monitors. The image seems like it is eroding away with a wind from one direction. There is ghosting to everything as shown in the image. The ghosting is fully static. And all monitors of the same type have it.

 

What type of panels are these? VA?

 

How can I minimize this effect? I tried playing with all the monitor settings.

[Hinjima]

5 minutes ago, Haswellx86 said:

In my college there are some labs with these crap monitors. The image seems like it is eroding away with a wind from one direction. There is ghosting to everything as shown in the image. The ghosting is fully static. And all monitors of the same type have it.

 

What type of panels are these? VA?

 

How can I minimize this effect? I tried playing with all the monitor settings.

 

Check the backside of the monitors for a product number. Easiest way to figure out the panel type.

[Haswellx86]

Also there sometimes seems to be a light wave running from left to right slowly. Like the same cut wave you would see when a monitor refreshes from up to bottom but here it is sideways and very slow to be visible.

[Eigenvektor]

Could also be caused by crappy cables and/or something else in the room causes interference in these cables. Does anything change if you move the cables into a different orientation?

[Haswellx86]

1 hour ago, Eigenvektor said:

Could also be caused by crappy cables and/or something else in the room causes interference in these cables. Does anything change if you move the cables into a different orientation?

I never touched the cables. I don't think that it is a cable interference issue. All the monitors of this type have the same issue, across different labs as well.

 

These don't look like the modern slim IPS displays. The older design with a little thicker bezzels and lower resolution than 1080p (or I think so). Just remember the Windows 7 era but actually not that old.

 

Oh wait. They use the big and thick blue connector cable for display. Is that VGA? Is that the problem?

[Eigenvektor]

1 minute ago, Haswellx86 said:

These don't look like the modern slim IPS displays.

They are LCD though, right? Not CRT?

 

1 minute ago, Haswellx86 said:

Oh wait. They use the big and thick blue connector cable for display. Is that VGA? Is that the problem?

Yeah, an analog signal/cable could potentially explain it. More susceptible to crosstalk

[Haswellx86]

8 hours ago, Eigenvektor said:

They are LCD though, right? Not CRT?

 

Yeah yeah LCD.

 

8 hours ago, Eigenvektor said:

Yeah, an analog signal/cable could potentially explain it. More susceptible to crosstalk

Hmm. Also the amount of eroding is different all the time, and weirdly it increases overtime the monitor is on. This happens to all these monitors, surely it is a known issue.

[Eigenvektor]

59 minutes ago, Haswellx86 said:

Hmm. Also the amount of eroding is different all the time, and weirdly it increases overtime the monitor is on. This happens to all these monitors, surely it is a known issue.

Do you have a product name, serial number or similar?

 

If it's a lot of these monitors in close proximity, might be they're all interfering with each another. If all of these monitors are indeed still using VGA and the cables are fairly long and unshielded, pretty sure they're all messing with one another.

 

You could try moving cables around, as I said. See if that has an effect on the image. Alternatively, can you turn all of them off except for one? That should help rule out if it is signal interference.

[Haswellx86]

2 hours ago, Eigenvektor said:

If it's a lot of these monitors in close proximity, might be they're all interfering with each another. If all of these monitors are indeed still using VGA and the cables are fairly long and unshielded, pretty sure they're all messing with one another.

 

You could try moving cables around, as I said. See if that has an effect on the image. Alternatively, can you turn all of them off except for one? That should help rule out if it is signal interference.

These are individual setups. No connection between them.

 

Do these monitors even use VGA? VGA is super old. But the cable isn't small and thin at all. The connector is big.

 

I will try to get any model number or something.

[Eigenvektor]

20 minutes ago, Haswellx86 said:

These are individual setups. No connection between them.

Cables are effectively antennas. If they're all the same length, they are transmitting/receiving on the same frequency. Especially if they are older and unshielded. Electromagnetic interference between them could result in the weird images you're seeing. So there could be a "connection", just not a physical one.

 

Changing the cable's position moves the electromagnetic field around them. If the weird images are a result of EM interference, moving these fields should have a visible effect. Though it's also possible something else is causing interference in these cables.

 

20 minutes ago, Haswellx86 said:

Do these monitors even use VGA? VGA is super old. But the cable isn't small and thin at all. The connector is big.

Can you maybe take a picture of them? You said above they are big blue connectors, which could be VGA. Though it's also possible they are DVI.

[Haswellx86]

@Eigenvektor

 

I highly doubt that it is the interference with the cables. The effect doesn't change if I am sitting on a far away setup with the surrounding computers off.

 

I also physically moved the cable a bit and actually I can only see a very slight artifact on the display, nothing much.

 

The model is LG 22MP410. It is VA.

 

Below is a screenshot of the display connector.

[Eigenvektor]

11 minutes ago, Haswellx86 said:

The model is LG 22MP410. It is VA.

Below is a screenshot of the display connector.

Yeah, that definitely looks like VGA. LG's specs say the monitor has D-Sub (D-Sub 15 is used by VGA) and HDMI. Computer appears to have DP as an alternative to VGA. The icon (monitor with two bars) is commonly used for VGA sockets.

 

The amount of dust on the connector makes me dread how much of that might be inside the machine. I wouldn't be surprised if that's causing issues.

[Haswellx86]

6 hours ago, Eigenvektor said:

Yeah, that definitely looks like VGA. LG's specs say the monitor has D-Sub (D-Sub 15 is used by VGA) and HDMI. Computer appears to have DP as an alternative to VGA. The icon (monitor with two bars) is commonly used for VGA sockets.

So basically the computer has VGA, DP and HDMI available?

 

VGA would be the worst choice. Why would anyone want to use that? What could be the reason here?

 

6 hours ago, Eigenvektor said:

The amount of dust on the connector makes me dread how much of that might be inside the machine. I wouldn't be surprised if that's causing issues.

How exactly would that be causing issues? It's not like the dust inside the cable or anything. Also this is so static and consistent to all the displays of this type, so it I think it couldn't be the dust.

 

These systems are Coffee Lake systems. I think we have Comet Lake systems as well with the same type of display and the same artifacts. Only the new Raptor Lake based systems have the modern and slim IPS displays.

 

Don't be bothered about the dust. Be happy that you have your system clean. The temps on the system do seem fine though. I am more bothered about the single channel memory these stupid OEMs ship. The modern i5 has gotten so powerful that we kind of don't need it, but of course I am not complaining. But it doesn't match with a single stick of 8 gig stick. A 13400 should be paired with 16 GB minimum.

[Eigenvektor]

14 minutes ago, Haswellx86 said:

So basically the computer has VGA, DP and HDMI available?

VGA would be the worst choice. Why would anyone want to use that? What could be the reason here?

No. Based on the photo, the computer has VGA and DP. According to LG, the monitor has VGA and HDMI. So the only common connector is VGA.

 

You could use an adapter to go from DP to HDMI, but that adds cost. If you happen to have one of those lying around, might be worth a shot.

 

14 minutes ago, Haswellx86 said:

How exactly would that be causing issues? It's not like the dust inside the cable or anything. Also this is so static and consistent to all the displays of this type, so it I think it couldn't be the dust.

The dust isn't inside the cable, but it could be between cable and port. Or on top of the GPU, potentially slightly shorting some exposed pins.

 

But yeah, maybe this is entirely the wrong track and it's some mismatch between monitor refresh rate and GPU. Using VGA which doesn't provide monitor information to the GPU probably doesn't help.

 

The monitor can supposedly do 1080p 75 Hz, but is limited to 60 Hz over VGA. Or maybe someone played around with the monitor's overdrive settings?

[Haswellx86]

1 hour ago, Eigenvektor said:

The dust isn't inside the cable, but it could be between cable and port. Or on top of the GPU, potentially slightly shorting some exposed pins.

Bold of you to think they would have a discrete GPU. And this problem can't happen to literally all the computers.

 

1 hour ago, Eigenvektor said:

Or maybe someone played around with the monitor's overdrive settings?

Someone can't play around with all the computers.

 

Tell me if there is any setting you recognize which can be related to this. I did try fiddling around with most of not all the settings with the settings of the display.

[Pusbucket]

@Haswellx86

are all the cables the same as the one in the pic?

If so, it may be missing a component that may solve the issue.

Very often VGA cables have magnet collar or ferrite bead at each end to help with signal integrity.

https://www.starte-cable.com/info/function-of-magnetic-ring-on-vga-cables-33377604.html

 

I'm thinking if you can try one with the ferrite beads it may make a difference.

[Eigenvektor]

16 minutes ago, Haswellx86 said:

Bold of you to think they would have a discrete GPU. And this problem can't happen to literally all the computers.

Yeah, iGPU, but there's still circuitry (on the motherboard) that could be negatively affected by dust.

 

16 minutes ago, Haswellx86 said:

Someone can't play around with all the computers.

Just saying, we did stuff like that at school for fun

 

16 minutes ago, Haswellx86 said:

Tell me if there is any setting you recognize which can be related to this. I did try fiddling around with most of not all the settings with the settings of the display.

Did you mean to post a picture of the settings? Anything like Overscan, Overdrive or similar in the settings?

[Pusbucket]

also what is in adjacent rooms/buildings?

if near the electrical room with giant power panels and such that could also be influencing the vga signal.

as mentioned before, they can act like an antenna.

[Haswellx86]

@Eigenvektor

 

I found out that one setup with the modern slim IPS displays was connected to VGA while others were using HDMI. That is why I wondered why I can't change the refresh rate from 60 Hz to 75 Hz of the monitor. That has no such artifacts with VGA. Maybe it is a problem with only those LG monitors on VGA?

 

Also, am I losing anything besides some refresh rate with VGA? I didn't see any other difference.

[Eigenvektor]

17 hours ago, Haswellx86 said:

Also, am I losing anything besides some refresh rate with VGA? I didn't see any other difference.

You lose some refresh rate and the ability for the OS to query the monitor's capabilities, because VGA can only send data to the monitor, but not return anything back.

 

It's also more susceptible to interference, because it's an analog signal. Which also means it's unnecessarily converting the GPUs digital output to an analog signal and the LCD monitor is then converting it back to digital.

 

But if you don't see any difference in this setup, that shouldn't matter