Just to complete this, in case anybody is interested.
The dmesg output confuses me because on the face of it "over-current charge" would suggest simply that the screen is pulling too much current. Obvious. However it happens simply by plugging in one of these leads, with nothing attached to it so no load.
So not actually pulling any current at all but presenting 5v from the same power supply that is powering the Pi on the 5v pin of the USB connector. I tried a couple of different style power supplies. And I don't know what causes the fan to run when the Pi is shut down as I don't have access to the Pi5 schematic.
I have fixed the problem by wiring up on of these for the touch input USB connection and omitting the +5v wire.
The dmesg output confuses me because on the face of it "over-current charge" would suggest simply that the screen is pulling too much current. Obvious. However it happens simply by plugging in one of these leads, with nothing attached to it so no load.
So not actually pulling any current at all but presenting 5v from the same power supply that is powering the Pi on the 5v pin of the USB connector. I tried a couple of different style power supplies. And I don't know what causes the fan to run when the Pi is shut down as I don't have access to the Pi5 schematic.
I have fixed the problem by wiring up on of these for the touch input USB connection and omitting the +5v wire.
Statistics: Posted by jimseng — Tue Jan 30, 2024 6:07 am