XPS13 all rails present, continuous shutoff cycle

[survivalbloke]

Re: XPS13 all rails present, continuous shutoff cycle

Since we still know to less about where it is Stuck, i'd continue with a overview which power rails are where present in the Brief moment. This means to measure voltage of each coil and share the values, maybe written in a picture of the actual board.

Will do, thanks!

[survivalbloke]

Re: XPS13 all rails present, continuous shutoff cycle

Since we still know to less about where it is Stuck, i'd continue with a overview which power rails are where present in the Brief moment. This means to measure voltage of each coil and share the values, maybe written in a picture of the actual board.

I'm posting a pic with voltage readings. Thanks!

[Sephir0th]

Re: XPS13 all rails present, continuous shutoff cycle

So everything till 1.05V is up and running. The PCH should do its job from here, but it obviously doesn't. Question is ofc, why.

What resistance to GROUND do you measure at the coils which shows voltage?

[mcplslg123]

Re: XPS13 all rails present, continuous shutoff cycle

I'm posting a pic with voltage readings. Thanks!

Can you post a larger pic? I'm having difficulty in reading what you wrote. Getting old perhaps.

[survivalbloke]

Re: XPS13 all rails present, continuous shutoff cycle

So everything till 1.05V is up and running. The PCH should do its job from here, but it obviously doesn't. Question is ofc, why.

What resistance to GROUND do you measure at the coils which shows voltage?

See attached, better photo.

[survivalbloke]

Re: XPS13 all rails present, continuous shutoff cycle

Can you post a larger pic? I'm having difficulty in reading what you wrote. Getting old perhaps.

That was a really bad picture, sorry. Please see the new, better pic.

[mcplslg123]

Re: XPS13 all rails present, continuous shutoff cycle

PL601 is most likely the ram coil and its not having any voltage. Check the PWM for S3/S5/Ton pins. When you turn on,do you get any voltage there?? What about the 1.8V/2.5V rail?? Are they coming up?

[survivalbloke]

Re: XPS13 all rails present, continuous shutoff cycle

PL601 is most likely the ram coil and its not having any voltage. Check the PWM for S3/S5/Ton pins. When you turn on,do you get any voltage there?? What about the 1.8V/2.5V rail?? Are they coming up?

I suppose I'll need an oscilloscope to check PWM? Also I don't know where to measure those. Lastly, I don't know where to measure for the 1.8V and 2.5V.

I realize this is really far beyond my experience level, but I'm learning, and I thank all of you.

[mcplslg123]

Re: XPS13 all rails present, continuous shutoff cycle

mEASURE VOLTAGE ON PIN 1/2/10/14 OF PU600.
1.8V can be measured at Pin1 of PU800 or on PL801 coil itself.
I think 2.5V rail is not used here.
All these voltage has to be measured after turning on the mb.
You need needle sharp probes to measure them.Be careful not to accidentally short between pins.

PS: Oscilloscope is a better option but we can get an idea with multimeter as well.

[survivalbloke]

Re: XPS13 all rails present, continuous shutoff cycle

mEASURE VOLTAGE ON PIN 1/2/10/14 OF PU600.
1.8V can be measured at Pin1 of PU800 or on PL801 coil itself.
I think 2.5V rail is not used here.
All these voltage has to be measured after turning on the mb.
You need needle sharp probes to measure them.Be careful not to accidentally short between pins.

PS: Oscilloscope is a better option but we can get an idea with multimeter as well.

OK, thank you. on PU600:
1 - 0v
2 - 0v
10 - 8.9v
14 - jumps to 1.7v then drops back to 0v

1.8v present at PL801

[mcplslg123]

Re: XPS13 all rails present, continuous shutoff cycle

Pin14 Voltage must be stable. I've not gone through the datasheet of this IC but usually VCC is 3V or 5V. What is the exact resistance on pin14??(no power attached). Is there continuity between PC606 & PC607(pin1 of both caps)?? You dont have the enables for this ram regulator-so cant expect any output.

AS per your measurement, you have missing RUN_ON_P as well as SUS_ON_P.Do you have RUN_ON_EC?

[survivalbloke]

Re: XPS13 all rails present, continuous shutoff cycle

Pin14 Voltage must be stable. I've not gone through the datasheet of this IC but usually VCC is 3V or 5V. What is the exact resistance on pin14??(no power attached). Is there continuity between PC606 & PC607(pin1 of both caps)?? You dont have the enables for this ram regulator-so cant expect any output.

AS per your measurement, you have missing RUN_ON_P as well as SUS_ON_P.Do you have RUN_ON_EC?

Pin 14 = OL
Pin 1 PC606 to Pin 1 PC607 = .7ohms
RUN_ON_EC = I get a brief(less than 1 second) 1.9v, then back to zero each time the board tries to power on.

[mcplslg123]

Re: XPS13 all rails present, continuous shutoff cycle

This mb SIO is in BGA form-so cant troubleshoot much. I've not much to suggest further. maybe other experts here can help.

[survivalbloke]

Re: XPS13 all rails present, continuous shutoff cycle

This mb SIO is in BGA form-so cant troubleshoot much. I've not much to suggest further. maybe other experts here can help.

Hey, I ended up just replacing the board, but I wanted to stop back here and thank you all for the help.