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PG32UCDM USB Hub turned off and coil whining

Fuchstraum
Level 7

Now I got my 3rd PG32UCDM and all 3 had the same issue and were needed to send back. I guess every of your PG32UCDM has this issue (tested with MCM103 and MCM105):

While in Power Saving mode the USB-A and USB-C ports (maybe USB-B as well) will be turned off and and the monitor starts coil whining after turning the monitor off. Pressing the power button one time will turn everything on again including the screen.

While in Standard Mode the USB-A and USB-C ports (maybe USB-B as well) will be turned off and and the monitor starts coil whining after turning the monitor off AND pressing the power button one more time (screen stays black). In Standard Mode I need to press the power button a 2nd time to turn everything on again.

In all scenarios the USB Hub was "On During Standby", but this doesn't matter because the problem also exists if it is changed to "Off During Standby". So it seems that in this "No-USB-Coil_Whine"-state there is a short circuit which produces a heavy load for the voltage converters so they start coil whining. Also while short-circuited the USB-ports have no voltage. But that's only speculation.

I made a video of this issues:
https://www.youtube.com/watch?v=UwSVNtMKJAU

USB Hub -option is "On during Standby". If you work with a USB device you're not allowed to turn off/on the monitor, otherwise the USB device will be disconnected. 00:00 Power Saving Mode 00:36 Standard Mode 01:28 Main issue 02:03 Coil whine Sorry for the loud breath noise...
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2 REPLIES 2

Aureliannn_ROG
Customer Service Agent

Hi @Fuchstraum ,

To better assist you in resolving the coil whine issue, we would like to gather some more information:

  1. Standby mode: Does the coil whine persist when the monitor is turned off or in standby mode?
  2. Power mode: Does the coil whine occur regardless of whether you select standard or power-saving mode?
  3. Repair history: Have you sent your monitor in for repair before? If so, please provide your RMA number and product serial number via private messege for our reference.
  4. Video format: To better understand the issue, we recommend providing a video of the coil whine in MP4 format.
  5. Hardware testing: We suggest trying to replace the PSU, GPU, or connecting cables to see if you can confirm that the coil whine is coming from the monitor itself.
  6. System configuration: To analyze the situation more comprehensively, please provide detailed information about your computer's configuration, including the motherboard, graphics card, power supply unit models and so on.

Providing this information will help us locate the problem more quickly.

Thank you.

 

Earlier before we have conducted a thorough investigation into this matter.

Our testing results are as follows:

  • Internal Testing: The team have conducted multiple noise tests on this model of monitor, and the results have shown that the noise levels are within normal ranges.
  • Laboratory Testing: To measure the noise levels more accurately, the team sent the monitor to a professional laboratory for further testing. In both standby mode and DC off mode, the noise level was consistently around 18dB. Generally, the human ear needs a noise level of around 25dB to perceive sound in a quiet environment. In a typical office environment, the background noise is usually around 30-40dB. Based on our test results, we have not found any significant coil whine issue as you described.
Providing detailed device specifications (MB/CPU/GPU/PSU, etc.) and the respective driver versions, OS version, and BIOS version will help us analyze the issue more effectively.

Fuchstraum
Level 7

Remember the problem isn't only the coil whine but also the shut down of the usb ports while the coil whine issue occurs. But to your questions:

1. In power saving mode it occours in both cases, in standby mode and when I turned off the monitor.

2. The coil whine occours in both modes:
In power saving mode after I turned off the monitor with pressing the power button 2 times or in standby mode after I turned off my computer (power LED is off).
In standard mode after I turned off the monitor with pressing the power button 2 times and press the power button a third time. But not in standby mode (power LED is orange).

3. I tried to make an RMA, but Asus told me I had to sent it to my shop. So there is no RMA number from Asus. The shop were to stupid to recognize the failure and sent it back to me.

4. I downloaded the youtube video I've provided before and converted it into a mp4-file. What should I do with the mp4-File? Where should I send it to?

5. It comes definitely from the monitor. I can reproduce it with any other and also even without any hardware.

6. PC-Hardware doesn't matter, I can use my Raspberry Pi 5 8G (HDMI), Galaxy S24 Ultra (USB-C) or my PC (DisplayPort):
Mainboard: B650M-A WIFI
CPU: Ryzen 7950X
GPU: Gainward Geforce RTX 4080 Phantom GS
Power Supply: BE QUIET DARK POWER PRO 12 1500W
OS: Windows 10
Monitor Firmware: MCM105

And to your testing results:
"Normal ranges" are not defined and subjective. For me who sleeps next to his PC it is to loud. For this price I expect no coil whine at all.

I've seen that some people got their monitor with a newer firmware MCM106, but it is not officially released. Maybe it is already fixed there, but you can't provide the download for now.