Thank you very much. Sorry about the delayed response in doing so. Seeing as it’s a power supply issue, I’m pretty convinced that the schematics will be pretty identical at that stage in the circuit. I’ve had a little read through and it seems that my problem with the barrel connector only spitting out 12 V could be well down to some of the P type fets or a zener gone wrong. Either way, the circuit gives me a great hint as to how the USB and barrel connectors work together.
Really appreciate it, thanks mate

Anything sitting on your hard drive SMDFlea?...

#embarrassing
DAX8QMB38A0 RevA
(photo attached for other noobs who find this thread.)

thank you...

Before now, Never did I ever know there was a model number that wasn’t 640 G8!
I think 43A58EA#ABU looks like the number?
thanks SMDFlea

Hi folks.
I have a 640 which doesn’t charge using the barrel connector, only via USB. Internal voltage rails only go up to 12V, they rise to 19.5 with the USB C.
Can Anyone who has the schematic lend a hand? I can read them fine so just a link would be great, but also any insight if you’ve seen this before.

Also, is there a list connecting the HP series model
numbers to the COMPAL model numbers?
thanks
dan

Just for completion, it became a right pickle which I’ve left for dead. I think I must have damaged a via or something as it was difficult to get the heat into the bios chip and I know I fried the wifi card next to, so a buried via or something on the back of the board could have easily been destroyed.
I Frankensteined a new laptop from its parts for about £100, and haven’t looked back. It was fun to play, no success this time.
Not jaded, just time to move on....