M7(M70F) 32 inch 4k monitor doesn't work with 4k 60Hz setting

[Junhyun]

I connected the monitor with bundle c-to-c cable and my Samsung Notebook 9 Always, which has Thunderbolt 3 port. The monitor doesn't show 60hz frame rate at 4k resolution. This must be a problem since I had no problem with my another M7 32inch 4k monitor which I had bought 2 years ago in South Korea. 

[Ben_H]

Hi, can you please provide the exact model number of the monitor? You can find it by going to Menu > Support > Information. It can also be found on the back of the monitor. In the meantime, I am working on typing up some steps in general, but with the model number, it will help to provide specific assistance.

[Junhyun]

The model number is LS32FM702UNXZA

[Ben_H]

Here are some steps to try. After each step, please check and see if the 60 Hz option appears.

- Go to Settings > All Settings > General & Privacy > External Device Manager > Input Signal Plus > Turn it on for the USB-C port.

- In Windows, go to Settings > System > Display > Advanced display settings. If 60 Hz is missing, Windows may be defaulting to 30 Hz due to limitations with the cable or port.

- Try another cable that supports DisplayPort 1.4 Alt Mode and 4K @ 60 Hz.

- If you still do not see the option through USB-C, use a Premium High Speed HDMI cable via the HDMI port, and set the monitor to HDMI 2.0 mode.

[Junhyun]

1. That's turned on by default
2. I replaced it with my roommate's c-to-c cable but it didn't work. When I connected my laptop with my roommate's LG 4k monitor and my roommate's c-to-c cable, it did work at 4k 60hz.
3. The same as above.
4. How to find HDMI 2.0 mode? I never heard of that. I believe it supports by default. My laptop HDMI port doesn't support HDMI 2.0. Thus, I need to connect with C-to-C cable.

[Ben_H]

I did some research, and some users reported that they weren't able to see 4K 60 Hz until after a firmware update. Here is the link to the firmware page: https://www.samsung.com/us/support/downloads/?model=N0002505&modelCode=LS32FM702UNXZA

I recommend updating the firmware using a USB drive. On this page, the steps are under "Update using USB": https://www.samsung.com/us/support/answer/ANS10002051/

Try forcing DisplayPort 1.4 mode by going to Settings > All Settings > General & Privacy > External Device Manager > USB-C Mode > High Bandwidth / DisplayPort 1.4.
(If the "USB-C Mode" menu is not visible, it may appear after a firmware update.)

On your PC, go to Device Manager > Display Adapters > Right-click the adapter and select Properties > Events and confirm if the negotiated link is HBR2 or HBR3.

Is your roommate's cable certified for 4K 60 Hz / DP 1.4?

If none of the above unlock 4K 60 Hz, it is most likely a firmware/EDID handshake issue, and you would need to contact support. Here is a support link specific to your monitor: https://www.samsung.com/us/support/contact/?model=N0002505&modelCode=LS32FM702UNXZA

If your monitor is still in warranty, I would contact them as soon as possible so you have warranty options available.

[Junhyun]

My monitor was already updated to the latest version : 1030.3. 

The USB-C mode does not appear in the menu.

Q : Is your roommate's cable certified for 4K 60 Hz / DP 1.4? A : Maybe? Otherwise it would not work.

If it is not handled, I would return it.

[Junhyun]

I bought a c-to-hdmi cable and connected them. Now, it supports 4k 60hz. Anyway, I am going to return this since there's no reason paying extra for not working c-type port.

[Samsung_K0eDufy]

Hello I have the same issue but I dont have external devices on my settings. My serial number is LS32DM703UUXUF