Is this with the same sd card in each? - Yes, it’s the same sd card.
So it worked with 4GB raspberrypi and now with 8gb version it doesn’t work anymore? - Yes, indeed. Although I will give it another test with another RPI4. I just sent the old one to work as PiKVM, thus the upgrade for my Quad SATA Hat to 8Gb. But definitely will try another RPI4 board as well.
And things got even weirder at this point. I listened to the advice of @Walter_White and connected the spare fan I have at home in place of the top hat fan. It works, however there is a difference in the behaviour. When the top hat fan blasts 100% all the time the spare starts at 100% and then it stops for a while then starts again. It feels like it’s trying to follow the PWM instructions, however the behaviour is sporadic and not as expected. This process repeats itself constantly. It’s definitely a HW issue, but I cannot pinpoint the failing element.
Update:
After some time troubleshooting and no I didn’t resolve the issue, just made it bearable, here’s what I did:
- Changed the RPi4 with a new 8Gb version - no change.
- Changed the top board with the LCD - no change.
- Tried different sd card with different levels/versions of software - no change.
Semi-solution was to buy a Noctua 40x40x10 3 pin 5V fan and after some soldering, wiring and tinkering with washers, bolts etc. installed it in the enclosure. Still at 100% but at least not screaming like the old fan.
I was kind of disappointed in my whole interaction with Allnet China, where I ordered the board from as the Quad Sata Hat was the only thing I haven’t changed or replaced yet. I got a reply from representative that the issue will be brought to the developers attention, but alas nothing has happened since 01.Oct.2023. I hope they will at one point take a look.
Here’s how the whole enclose looks with the new fan though: