Lenovo ideapad 5 windows 11 update disable charging circuit?

[bogart219]

Hello.Still working on this problem little by little each day, reading and studying. The main thing I'm trying to accomplish now is following the 5 volts from the usb-c jack and see where it stops.

Can you identify what kind of diode this is?


I believe the diodes in this picture are are back to back avalanche diodes in one package. What is the purpose of this setup? I'm assuming one of these is the usb-c protection chip (if this board has one that is).


Thanks!

[bogart219]

Hello.Still working on this problem little by little each day, reading and studying. The main thing I'm trying to accomplish now is following the 5 volts from the usb-c jack and see where it stops.

Can you identify what kind of diode this is?


I believe the diodes in this picture are are back to back avalanche diodes in one package. What is the purpose of this setup? I'm assuming one of these is the usb-c protection chip (if this board has one that is).


Thanks!

Nevermind. I found out these are TVS or ESD diodes. thanks.

[bogart219]

Hello fellows, I'm still plugging away and haven't given up yet. Here is something that doesn't seem right to me. This a power supply which I believe is for the ram at 1.2 volts. With my meter in the diode mode (beep), I get steady beeping across the one mosfet, the inductor and three capacitors, all are circled in this pic. am I barking up the wrong tree? Thanks!

[bogart219]

Does this description of low & high side mosfets sound correct? I'm having a hard time wrapping my head around this when he says "goes to ground". Wouldn't that be a dead short?