Dell inspiron 7567 can't recognize AC adapter

[taimatem]

Laptop suddenly stopped being able to recognize AC adapter therefore rendering it incapable of battery charging. Admittedly it does sometimes charges up all of a sudden. Is it definitely problem with multicontroller or could there be something wrong with another components?

Snapshot from oscilloscope on a side of multicontroller is attached (IIRC taken from MOSFET pin that has direct connection to multicontroller). On charger side second dip is down to zero (voltage is uncalibrated, substract around 0.6-0.7V)

[ktmmotocross]

Re: Dell inspiron 7567 can't recognize AC adapter

u must check ID_pin circuit, or change charger

dell is checking charger by ID_pin circuit which check wattage and originality of charger

[taimatem]

Re: Dell inspiron 7567 can't recognize AC adapter

As I implied signal reaches multicontroller. However, something on laptop side seems to pull up on the second dip which should be presence notification from "slave" (charger) side, making it undetectable.
BTW, unfortunately schematics for the laptop are seemingly unavailable publicly, so sadly I can't just lookup which components are involved in the circuit
PS I kinda wonder why it still charges periodically

[SMDFlea]

Re: Dell inspiron 7567 can't recognize AC adapter

Is the motherboard an LA-D993P - https://www.badcaps.net/forum/showthread.php?t=81570 ,i`m not sure if thats the right schematic, half of the pages say LA-D991P ?

Check the ID_pin at the DC-IN connector when its charging and not charging.It could simply be a worn power jack.Have you tried another genuine dell charger

.

[taimatem]

Re: Dell inspiron 7567 can't recognize AC adapter

Thank you very much, SMDFlea! Mine is actually LA-D993P. I suppose 993 is i7 1050ti and 991 is i5 1050.

And it seems like I found potential culprit: PR114 should be 33Ohm, while I measure it at 6kOhms (probably should have expected something weird since it also has a weird bump

P.S. ID pin was actually marked as PSID on the schematics

Upd.: replaced the resistor (thankfully I had one 33R 0402 at my disposal) hopefully it was just a one time thing and won't repeat anytime soon