Sad that i have already bought the displaythe Pi doesn't like backfeeding on the 3.3V rail.As far as I understand the issue here is entirely power related , right?Pi5 works fine with the display made by Raspberry Pi, and with some 3rd party ones (eg Waveshare's through the vc4-kms-dsi-waveshare-panel overlay).
What you are looking at is a third party who has cloned the original Pi panel with something that appeared close enough.
Pi5 does update a few parameters with regard the DSI spec, but we test against the device(s) the drivers were written for, ie the Raspberry Pi panel. If these clones don't like those changes, then I'm afraid that is not Raspberry Pi's fault.
Looking at that particular panel, I suspect it is also trying to power itself solely via the 3.3V rail on the FFC. That has never been specified for heavy loads like a display (hence the Pi panel having a separate 5V supply), so if it may be that they have power issues. I seem to recall someone with a Pi5 trying 2 of these screens that power themselves off the 3.3V rail, and it sags too much.
If i tried getting a PI connect the 2 and powered all up is there a change of frying that PI or just the rail is gonna hang low ?
If the latter ius the case , since im designing the BMS/PMS of this portable im makking , if i had a 2nd buck boost to make 3v3 and pluged it on the 3v3 headers just to get some load off the internal regulator you think it would help ?
I have already designed a 5v supply , im powering the Pi3b+ via the 5V header and it ..works
Wait for waveshare to exchange their stock or buy another product.
There are several reports of this! Design flaw of waveshare, them trying to get rid of the 5V supply wires.
Sadly that failed!
Sticking with Pi3 for now
If i get a pi 5 and plug this display there can i damage the pi or the display?
Statistics: Posted by finos — Sun Apr 07, 2024 6:35 pm