at 1:26 in the video there is another chip getting hot.
I don't know right now what that chip is as it's inaccessible without removing the motherboard and my old photos I posted here on badcaps of the motherboard are gone, actually all the photos I posted on this forum around may and june 2025 are gone....

at time 1:50 in the video I see the voltage regulator EH11A 652J84 is heating up....

As seen with the thermal camera the Texas Instruments SN104961PJP is heating up.
I hope that's not the problem because it's a custom chip....

New video in which the printer is fully assembled apart from the top part lifted away which is sitting aside (but with all cables connected) so I can see inside the printer.
I show with a thermal camera what it looks like when powering up the printer.
Can you see anything peculiar?
https://rumble.com/v6ye2uu-faulty-hp...mera-view.html

Thanks.

I got the relay and diode.

First I wired the relay coil to the charger, one wire to ground and the other to an inductor on the charger that I measured has 5V when the charger is plugged in. I also put the diode in parallel on the relay coil.
Now I hear the relay click when plugging a USB cable to the charger.
Then I connected the two battery wires through the relay to the charger so that only when the relay is switched on they get continuity, but otherwise the battery is essentially disconnected from the charger.
I glued the relay down near the...