[Chris]

After replacing the USB C port itself and the IC providing the 5V VBUS voltage to the port, I can now successfully connect USB devices like a USB wireless adapter, flash drive or other devices via the port. However, I still cannot connect a display to it via a USB C to HDMI or a USB C to DisplayPort adapter. Windows will detect the new monitor just fine but I cannot get it to display an image on the monitor. In the settings it also says that the monitor is not active for whatever reason and strangely, the mouse cursor becomes invisible as soon as I connect the external monitor. So there is either still a problem related to the port, a software/driver problem or the adapters I tried aren’t compatible with the notebook.

[Chris]

Unfortunately this didn’t solve the problem. The short of the two pins is gone but it still doesn’t detect a screen or any USB devices plugged into the port except the charger. Can anybody who also has the Mi Notebook Pro with the i7 8550U and the MX150 confirm to me that it is able to detect any USB devices plugged into that port (the same one used for charging)? If yes then the only ICs that could still be faulty are the USB3 Redriver (PS8713B) or the DP Redriver (PS8330B). I already replaced everything else around those ICs. The port itself is also fine because I checked every pin on both sides of the connector using a USB C breakout board.

[Chris]

After some more tests I found out that the USB-C port of the notebook isn’t working. I already did some measurements and found that the RTS5450 IC which controls the port seems to be at least partially broken. For whatever reason it would charge just fine but it wouldn’t detect any other devices plugged into the USB-C port and two pins of the port were shorted to each other. I already desoldered the chip and ordered a new one. Hopefully this will fix it.

[Chris]

I also tested the video output with a USB-C to DisplayPort adapter now but still can’t get it to display an image on the screen. Are there any special drivers which I need to make this work (I do not use the original chinese Windows 10 that was preinstalled) or what could be the problem here?

[Chris]

Thanks for the quick response! I am not really sure which adapter I need to test this because isn’t there a difference between a USB-C to HDMI adapter and a Thunderbolt to HDMI adapter, or does this not make any difference? I just bought a USB-C to DisplayPort adapter just to see if I can at least get any image output via DisplayPort but this is really just me trying random stuff and hoping for the best. Is there no better way than trying random adapters to figure this out? I don’t even trust the spec sheet(s) anymore at this point because there is so much misinformation everywhere online that I’m not really sure what to believe. One site even said that my Mi Notebook Pro model has a Thunderbolt 3 port which is simply not true.

[Chris]

Hi there,

I am also trying to connect a screen via HDMI to my Mi Notebook Pro (i7-8550U, 16GB RAM, MX150 GPU) through the right USB-C port but I cannot find a single USB-C to HDMI adapter which actually works with this laptop.
Here are the adapters I tried so far:
https://www.belkin.com/de/docks-hubs/usb-c-docks/usb-c-to-hdmi-charge-adapter/p/p-avc002/

https://www.digitus.info/de/produkte/computer-und-office-zubehoer/computer-zubehoer/usb-komponenten-und-zubehoer/grafik-adapter/da-70856/

https://www.amazon.de/gp/product/B07M64KG2Q

With none of those adapters I can get an image on my screen via HDMI.  Does anyone know an adapter which allows me to charge the laptop and connect a screen via HDMI at the same time? The choetech adapter which was mentioned here before does not seem to be available via any of the links I found, or is there a way to get it shipped to Germany?

Thanks a lot in advance!

[Author]

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