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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?
1This question has little to do with the Pi. What you are asking is it safe to connect 2 switch mode supplies together – to which the answer is NO – Milliways 2 hours ago
Hi @Big Bob, Welcome and nice to meet you. Ah, let me see. Your Rpi screen looks good, as summarized below: (A) “Amazon Landzo 5 Inch Touch Display for Raspberry Pi “: amazon.com.au/LANDZO-Touch-Display-Raspberry-Banana/dp/… Features: (1) Hardware Interface -HDMI, USB, (2) Connector Type – USB, HDMI, (3) Date First Available -17 July 2019, (4) Customer Reviews – 5.0 out of 5 stars 1 customer rating, (5) Amazon Bestsellers Rank 1,427 in Computers #23 in Monitors. / to continue, … – tlfong01 21 mins ago Delete
Now let me look at your power bank, as summarized below: (B) “OfficeWorks Keji 15000mAh Powerbank – US$30”: officeworks.com.au/shop/officeworks/p/…. Features: (1) Single USB port to charge smart device like a tablet or phone, (2) 15000mAh, can connect device for charging using micro-B USB cable, (3) Not fast charge compatible, (4) 2 USB Charge Ports, (5) Max crrent 2.4 A. (6) Voltage Provided 5 V. / to continue, … – tlfong01 11 mins ago
Your screen spec is not clear. I usually read user manual of a similar product from a reputable vendor, eg AdaFruit, SparkFun, or WaveShare. Now I casually googled the following: (C) :Waveshare Raspberry Pi IPS 1024×600 7inch HDMI LCD”: amazon.com.au/Waveshare-HDMI-Capacitive-LCD-Toughened/dp/…. / to continue, … – tlfong01 3 mins ago Edit
Now that we have three devices – 2 screens and 1 power bank, to refer to for discussion. Ah, locking own lunch time now. See you late this afternoon or evening. Cheers. – tlfong01 just now Edit