I did not. Maybe I'll get to it this year
bla2c
Member
Last Activity: 09-05-2023, 11:30 AM
Joined: 02-11-2021
Location: Luzern
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
I did not. Maybe I'll get to it this year
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
Looks like your system has discrete MOSFETS and separate driver ICs (e.g. PU402 NCP81253MNTBG). Your problem could be entirely different. Does PU401's pin 38 VR_RDY (VGATE) ever go high? If yes then our faults are not related.Leave a comment:
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
Did not touch BIOS flashing/programming.
The CPU cannot turn on, because the PMIC does not signal power ready, because the power rail never comes on, despite the PMIC driving the PWM.Leave a comment:
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
My issue for sure is related to the power rail not coming up. There is no way to enter the BIOS without getting the CPU core rail up first.Leave a comment:
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
No, nothing yet. Didn't get yet to building a test PCB for the MOSFET driver. Do you have a similar problem or any additional ideas?Leave a comment:
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
yes, components present, and COMP seems to ramp up fine - there is a PWM signal coming from U137 to U136 (see scope trace above)....Leave a comment:
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
No, the logic board failed during normal operation (youtube video playing, no interaction with system).
As you can see above, I have traced the problem to a missing power rail, presumably due to a defective gate driver/MOSFET IC. However, after replacing the IC, the problem persists.
It is clear that without that power rail, the system cannot start. I believe something around that power rail generation is the root cause.Leave a comment:
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
Yea, their solution was to replace the logic board; I want to fix mine...
Leave a comment:
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
bumpLeave a comment:
-
Re: X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
5V definitely present. No damage visible on any of the components.
I'm contemplating building a test PCB for the NCP81382 to see whether the ICs work in isolation.
I'm tempted to lift the current sense resistor R3177 to remove the output rail load in order to see whether without any load I can observe switching activity. That seems like a remote possibility though; I should be able to see switching activity on the inductor even with the output shorted (which it isn't,...Leave a comment:
-
X1 Carbon beeps "0001: Reset error (platform reset not de-asserted)"
I have a Lenovo X1 Carbon (5th gen, 20HR, YD1KL-3, NM-B141) which beeps when power is applied. The beep code decodes to:
[INDENT]0001: Reset error (platform reset not de-asserted)
[/INDENT]
This is a correct assessment by the embedded controller: the NCP81218 (U137) DC/DC controller never asserts [FONT="Courier New"]VR_RDY[/FONT], which is routed to the CPU package [FONT="Courier New"]PCH_PWROK[/FONT] pin.
It looks like it tries to ramp up its [I]1B[/I] rail, which is driven by a NCP81382 (U136).
U137's [FONT="Courier... -
Re: New Members - please post your introductions here
Hi forum!Leave a comment:
No activity results to display
Leave a comment: