Video signal not passing through ThunderboltEX 4 to USB C portable monitor

[Grimgnaw]

Hi everyone. I purchased the ThunderboltEX 4 and a small touch portable monitor, that is not thunderbolt 4 but with "full featured USB-C". This is what I did:

1. Updated the motherboard BIOS to the latest version (version 2506) for the Asus Rog Strix X670e-e GAMING WIFI

1. Installed the PCIe TB card (pag. 61 from MB manual), connected the TB header and USB header to the MB and also the 6 pin power connector. The card is installed in the bottom slot, not sure if this is correct, but the manual doens't say much about it except "Ensure to install the Thunderbolt series card to a PCie slot from PCH". I don't know what PCH means. The image in pag. 61 shows the card been installed in the bottom slot so that's what I did.

2. Went into BIOS and under "AMD PBS" found the "Thunderbolt 4 JHL8540" option and turned it on.

3. Booted into Windows and installed the thunderbolt drivers,  from the motherboard support page and the thunderbolt control center identifies the card in the "details tab" (see attached image and sorry its in Portuguese)

Details of TB control center

4. Device manager shows the drivers are working properly with no yellow/exclamation mark. After this I rebooted pc.

5. In windows, I connected the Display port from my Nvidia card to the TB card IN port.

6. At this stage I connected my touch portable monitor using the "full feature USB-C" cable, that came with the monitor, to port 1 on the TB card

7. The monitor turns ON, so it receives power, but not the video signal. Thunderbolt control center doens't identify any connected device.

8. Tried updating the TB card firmware but its already the latest version (MB BIOS updated previously)

The touch monitor is decribed with "full featured USB-C" for video, touch and sound with the same feature described in the user manual with cable diagram (basically a single cable)

So according to windows, the drivers are working properly, the TB control center identifes the TB card, but the monitor receives no video signal. At this stage I don't know what to do, since I get no error messages, no warnings. 

My MB doens't have USB with DP capabilities so thats why I went for the ThunderboltEX 4. This is my first experience with Thunderbolt connectivity and I want to expand my devices using TB ports, starting off with this monitor, but I have to say this is not a good start. I was hoping if any of you guys would see something wrong with this procedure. Am I missing something in here? Should I conclude the monitor is the problem?

Just to clarify, I don't have additional TB devices to swap back and forth to see what works and i don't have other "Full featured USB-C" devices or USB hubs. Its my first time using TB. I tried swapping the USB-C cable, that came with the monitor, with a proper thunderbolt 4 cable that I purchased, hoping this was the issue, but it didn't work.

[Grimgnaw]

Hi all,

I have a short update on this. In trying to troubleshoot this issue without spending too much,  I read that TB ports are backwards compatible to older USB versions. I bought a USB-C to A adapter, just to connect a regular USB drive, but unfortunately it didn't work. I get nothing from TB control center or Windows. If I connect the same USB drive to a regular port on the PC case then its works.

Before trying the USB pen I was leaning more to a defective monitor. The same monitor also has HDMI connection, I bought the necessary cable and connected directly to the GPU card and the monitor worked.

Now I´m thinking that perhaps the ThunderboltEX 4 card I received is not working properly. What are your toughts?

[Grimgnaw]

Hi all,

Because I cannot find the cause of this issue, also the fact that nothing seems to work when connecting any device to this board, I have decided to return it.