Dell XPS 9530 psu uknown/not charging

[jagiro84x]

hello there ,
as stated in the title, the machine is not recognizing the adapter nor charging the battery, i have been stuck with this problem solving for almost 2 days now,, my eyes hurt and i just hope someone can point me to the right direction

the adapter in use is a original Dell Slim 130w adapter with small pin
the motherboard in question is : LA-9941p Rev 0.1

voltage on the center pin is always around 3 volts ( connected to the Laptop or not)

19 volts present as wel, the laptop works but only in low speed mode , stuck at 800mhz on all cores.

i had some other dell adapters laying here as wel, from 45 to 65 w and those dont get recognized either..

i have replaced the power jack allready with new one.

i have tested the PSID rail and from what i can see all seems fine? am i missing something?

as you can see on the picture (all the rails i have tested are marked with arrow and measured Voltage)

<a href="https://ibb.co/s95Gsxh"><img src="https://i.ibb.co/3mfqS6w/Voltages-dell-xps.jpg" alt="Voltages-dell-xps" border="0"></a>

<a href="https://ibb.co/s95Gsxh"><img src="https://i.ibb.co/s95Gsxh/Voltages-dell-xps.jpg" alt="Voltages-dell-xps" border="0"></a>





edit : the image is not showing well on the thread,, a direct link: https://ibb.co/s95Gsxh

[mon2]

Re: Dell XPS 9530 psu uknown/not charging

If the laptop is running slow, the adapter is not being properly detected due to this single wire adapter ID circuit. Same case for not charging.

Replace PQ100 and test again.

[jagiro84x]

Re: Dell XPS 9530 psu uknown/not charging

If the laptop is running slow, the adapter is not being properly detected due to this single wire adapter ID circuit. Same case for not charging.

Replace PQ100 and test again.

Thanks for the fast response, could i test the pq100 before replacing it? It seems to me all the voltages are passing by normally, do you see anything strange?

The end of psid line after the resistor 33ohm has also voltage and it's going through the motherboard twards the UE1 chip which is controller. Ofcourse i can't test underneath the chip if the voltage is indeed coming through, that's my biggest fear that the ue1 chip has malfunction

[reformatt]

Re: Dell XPS 9530 psu uknown/not charging

Double check your adaptors, as the centre pin should have virtually nothing on it when its not connected to the laptop. The two different types I have here measure about 100 to 200mv.

Centre pin of the adaptor is connected to a simple pre-programmed one wire chip (OWC). Power is provided to that chip on it's data line (parasitic power) from the laptop, not the charger itself. When power is first applied to it, the OWC dumps out the power supply identification and then stops. If you put a scope on this line, you see a short burst of data after the adaptor is first connected.

It's not documented by Dell, so have no idea if the laptop side ever interrogates the charger subsequently via the PS-ID line (for situations like when the charger is still connected and the laptop has been put to sleep). Likely it just pulls the PS-ID line low momentarily to remove power such that the chip resets and reissues its ROM contents.

Usual failure I've seen is collapse of the socket in the laptop side allowing 19V up the centre pin, destroying the OWC in the process. So you need to replace both adaptor and socket to resolve. It's possible that all of your adaptors are faulty.

[mon2]

Re: Dell XPS 9530 psu uknown/not charging

Yes, something strange...

Mosfet is N-channel so to turn ON, the gate voltage has to be higher than the voltage it is passing.

Gate voltage is low, yet the pull up resistor is connected to a +5v power rail.

The transistor at PQ101 is not enabled so something is wrong.

The observed voltage on this ID line is from the logic board pull-up.

Also, can you confirm the +3VALW voltage? Seems high.

[reformatt]

Re: Dell XPS 9530 psu uknown/not charging

BTW, the purpose of PQ101, is for that very situation. When 19V appears on the PS-ID line, the base voltage of PQ101 rises high enough to switch on. That then switches off PQ100 and protects the EC. Much better design than Lenovo whose voltage sensing goes directly to the EC, and destroys it when you have a bad socket.

PQ101 is normally off and is only there for protection.

[jagiro84x]

Re: Dell XPS 9530 psu uknown/not charging

Hey there, as mentioned i have allready replaced with a brend new power socket, also i have cut the 130w dell wires and connected a new jack to it, now the center pin voltage is around 200mV and only when connected does it show 3+v.
Still battery is not charging and unrecognized psu.

The battery i have inside is also brand new , but 0% charge

From what i understand you both are suggesting to replace pq100?

Just to mention, i am not professional at doing this kind off repairs, i am still learning so your help is really welcome but maybe try to explain it in a more understandable level . Thank you so much for taking time to assist me

[reformatt]

Re: Dell XPS 9530 psu uknown/not charging

Gate of PQ100 should be 5v. Remove pq101 to check. If it’s still low then replace pq100.

[jagiro84x]

Re: Dell XPS 9530 psu uknown/not charging

Gate of PQ100 should be 5v. Remove pq101 to check. If it's still low then replace pq100.

Isn't gate of pq100 receiving voltage from 5valw and going through resistor pr105 which lowers the voltage from 5 to 3?

Cause psid-1 line is only sending 426mV

[jagiro84x]

Re: Dell XPS 9530 psu uknown/not charging

And there is nowhere on the schematic shown what voltages should be

[reformatt]

Re: Dell XPS 9530 psu uknown/not charging

PR105 is a pullup to bias on PQ100. It's a MOSFET, not a JFET so there shouldn't be any current flow at all. V=IR dictates you will have no voltage drop across PR105 in that instance.

Initially, the internal diode of PQ100 should allow 3V to be present on the drain side irrespective of the gate. This would initiate the comms from the OWC in the adaptor. However PQ100 needs to turn on in order for it pass the PS-ID data from the charger.

The voltage divider PR104/PR106 should not provide enough bias to switch on PQ101. This is only here for overvoltage protection. When the voltage is high enough, this switches on PQ101, shorting the gate of PR100 to ground, in turn switching it off. Since you don't have 0V on the gate, you'd assume that PQ101 isn't switching on (and your measurements indicate it isn't being biased on either).

Therefore, if you do have a voltage drop on PR105, there is current flow somewhere. Either via PQ100 itself, or PQ101 is leaky.

PR101 is nostuff. You could install it to bypass PQ100 to test if that resolves it.

[jagiro84x]

Re: Dell XPS 9530 psu uknown/not charging

Gate of PQ100 should be 5v. Remove pq101 to check. If it’s still low then replace pq100.

Hey there, i am slowly going through the posts and trying all suggestions.

I have removed pq101 and voltage is still same

What confuses me the most is, you mention the pq100 gate should be 5v, if you look at the picture i just uploaded and from my understanding looking at the schematics, the gate is getting it's voltage from pr105 , is this correct? Cause the gate pin is directly connected to pr105 pin1. At pin 2 of pr105 there is indeed 5v, but that's on the other side.

The purple marking is of the pq100 gate


I have also redone all the measurements as can be seen on second picture

Also maybe worth mentioning, before i did anything, i also checked the resistance of all resistors
I noticed the pr105 had 8k while in schematics it says should be 10k. So i replaced the resister with brand new 10k(which i measures before soldering and it was giving 10k.
After soldering the new resistor of 10k, i remeasured and it dropped down to 8k as wel.

https://ibb.co/F5QydRV
https://ibb.co/2hrBm87

[jagiro84x]

Re: Dell XPS 9530 psu uknown/not charging

PR101 is nostuff. You could install it to bypass PQ100 to test if that resolves it.

So if i understand correctly, i could remove pq100 and pq101 and solder a jumper cable between pr101 pin 1 and 2 to bypass and let the data go through? (Since it's 0ohm resistor)

[mon2]

Re: Dell XPS 9530 psu uknown/not charging

Yes.

[jagiro84x]

Re: Dell XPS 9530 psu uknown/not charging

finally some progress! its now showing the adapter wattage after removing pq100 + pq101, and making a jumper wire (in my case 10ohm resistor) between pr101 pin1+2 with

and finally my brand new battery is charging !!

u have no idea how happy i am with all the help from you guys

[mon2]

Re: Dell XPS 9530 psu uknown/not charging

Good. You should order fresh pq101 and pq100 parts to rebuild this circuit like the original.

The bottom transistor is acting like an over voltage crowbar to shut off the mosfet that you just bridged.

The mosfet is passing through the power adapter communication over the single wire interface.

If you are using the official power supply, you should be ok to use as-is for now.

AliExpress should have these parts but they should also be available local to you from RS or Mouser or Digikey. They can be replaced by many other generic parts and vendors.

[reformatt]

Re: Dell XPS 9530 psu uknown/not charging

I have removed pq101 and voltage is still same

What confuses me the most is, you mention the pq100 gate should be 5v, if you look at the picture i just uploaded and from my understanding looking at the schematics, the gate is getting it's voltage from pr105 , is this correct? Cause the gate pin is directly connected to pr105 pin1. At pin 2 of pr105 there is indeed 5v, but that's on the other side.

PQ100 is a MOSFET, as such gate resistance should be very high. If PQ101 is removed, that means the only way voltage could drop at the gate is that PQ100 is faulty.

Ohms law.....V=IR.

[warguello]

Re: Dell XPS 9530 psu uknown/not charging

Hello, please I need help with a similar problem, months ago my Dell XPS stopped charging, I tried all the recommended methods (try original charger, power connector cable, drain battery) but nothing worked. In the end I disassembled the motherboard and discovered that near the PQ101 component there is a burned component, but I cannot identify it to replace it. I leave a couple of photos, maybe you can help me. thaks a lot.



https://www.lanamme.ucr.ac.cr/cloud/...RYOkpLCpmcjV3f
https://www.lanamme.ucr.ac.cr/cloud/...Rpz9JvOq2USGKa

I am not an expert in electronics, and less in integrated circuits. When I tried to clean the surface of the component, it disintegrated a bit.

[mcplslg123]

Re: Dell XPS 9530 psu uknown/not charging

Mpost likely its PD102.