5V @ 5A has to be negotiated. That's unlikely to be a mode that your display supports, and nor will your Pi4.
You may get away with a 3A power supply on your Pi4, but just keep an eye open for low voltage warnings.
I have just tried with a similar Zftvnie touchscreen (yes unavailable, but a number of similar ones are around) on a Pi5.
If you use a USB-C PD hub such as https://www.amazon.co.uk/KRISUHO-Multip ... B0B3WYW655, then it will pass the USB-PD negotiation through to the Pi to get the full 5A. A USB A to USB-C cable then plugged between that and the monitor delivers enough power for the display, and gives the touch control.
Please note that I do NOT recommend that particular display (even if you could get it). It seems to have a tendency to not want to power on, and makes weird noises if it has HDMI connected but no USB-C.
USB-C hubs also vary in what they will and won't do. Another one I have only reports to the Pi that 1500mA is available.
You may get away with a 3A power supply on your Pi4, but just keep an eye open for low voltage warnings.
I have just tried with a similar Zftvnie touchscreen (yes unavailable, but a number of similar ones are around) on a Pi5.
If you use a USB-C PD hub such as https://www.amazon.co.uk/KRISUHO-Multip ... B0B3WYW655, then it will pass the USB-PD negotiation through to the Pi to get the full 5A. A USB A to USB-C cable then plugged between that and the monitor delivers enough power for the display, and gives the touch control.
Please note that I do NOT recommend that particular display (even if you could get it). It seems to have a tendency to not want to power on, and makes weird noises if it has HDMI connected but no USB-C.
USB-C hubs also vary in what they will and won't do. Another one I have only reports to the Pi that 1500mA is available.
Statistics: Posted by 6by9 — Wed Dec 11, 2024 5:18 pm