I just bought a Raspberry Pi 4 a few days ago but im already having issues with it and im trying to ascertain whether its a hardware fault or something I might be doing wrong.
Current OS is Ubuntu 23.04 desktop
So currently the display output from the Pi is turning on and off and now its predominantly off, I manage to get ssh access whilst it was showing in the beginning but like I said there’s no display output most of the time.
I presumed it was the hdmi adapter or cabling issue so I purchased a Ugreen hdmi to micro hdmi cable but the issue persists.
for the cable im using an apple iPad usb-c to usb-c.
for the power supply ive tried an apple 20w and a 30w laptop power adapter which both support 5v 3amp
which results in the same situation on both power supplies, and I don’t think its a load issue because the cpus are going above 20% on all cores.
Question: the Pi4 when first issued had problems drawing the correct power when fed with a USB-C to USB-C cable from a power unit’s PD socket. Dunno if that fault still exists (it was missing resistors).
If you could try using a.n.other power unit or power bank with USB-A output and connect your Pi4 using a USB-A to USB-C cable - see if it is simply a power supply (connection) issue.
There was an issue with, I believe, the E marked USB C cables. If this issue had been posted on the Official Pi forum, you would have been inundated with “use the official power supply” replies.
The first release of the Pi 4 had the USB C ID resistors incorrectly wired up in a none standard way.
I managed to figure out what the issue was in the end.
It wasn’t the power supply because I’ve got the newer model of RP4B.
It was ironically the third-party case that I was using.
When I got the pi in the post, i put it straight into the case before I even powered it up, my error.
So, after you said to try a different operating system, I did and at first it had the exact same “fault”, but then it occurred to me, may be the case was bending the PCB, because it’s a passively cooled case and it was pretty tight when you sandwich it together.
So I popped the PCB out of the case, and as I did that it was still plugged into the HDMI and I noticed that it wasn’t pushed all the way in because of the thickness of the wall of the case.
Soon as I push the HDMI all the way in, solid signal, no issues since. It was probably protruding maybe 1mm but I guess that was enough.
So when I screwed the case back together, I pushed the board inside the case as far to the side as I could, and then clamped it with my hand, and tightened it so it would stay in place, so now when I plug it in, it has no problems.
The walls of the case are basically too thick in my opinion.
It’s this case if you’re curious.
Geekworm Raspberry Pi 3 B+/ 3B Case, Pi 3B+/ 3B Aluminum Alloy Passive Cooling Case Housing for Raspberry Pi 3 Model B+/Raspberry Pi 3 Model B (P252) https://amzn.eu/d/ahlXzdc