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I have recently invested in a HDMI touchscreen from Amazon, and a Raspberry Pi 4, For the touchscreen to work it must be connected via GPIO, however my pi cannot supply enough power to it from my usb power bank which can provide enough power for the pi but not the display. As the display has a usb port for power as well as GPIO, I attempted powering the display from usb, however this caused the pi to boot up, hinting that there is some connection causing power to go into the pi from GPIO, thus I question whether it is safe to power the pi from GPIO and USB-C simultaneously?

Update (6/05/20): I am asking this question as when I power it from the USB-C on the Pi alone it gives me a yellow lightning bolt in the top right-hand corner.

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Question

How to connect Rpi to a HDMI Touch LCD Display?


Answer

Suggested connection

hdmi display connection


HDMI Touch Screen Wiring Diagram

hdmi 5"


References

(1) AliExpress Waveshare 5 inch HDMI LCD (G) resistive monitor touch screen LCD 800X480 - US$50

(2) Amazon 5" LCD Touch Display for Rpi - Landzo

(3) AliExpress Waveshare Rpi 7" HDMI LCD IPS Capacitive Touch Screen - US$57

(4) XPT2046 Touch Screen Controller Datasheet - Shenzhen XPTek

(5) WaveShare 5" HDMI LCD (G) Wiki

(6) WaveShare 5" HDMI LCD (G) User Manual


Appendices

Appendix A - XPT2046 Touch Screen Controller Block Diagram and Operation

xpt2046


Appendix B - WaveShare 7" HDMI LCD Touch Screen Selection Guide

LCD Selection Guide


End of Answer


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