Dell 15 9510 - USBC 20V but no current

[gurj1979]

Hi guys.

Got a strange issue with a Dell 15 9510.
No liquid damage.

A client put it in the IT room for a year, boxed up. Now they come to use it and it's not working.

I put my USBC tester to it and it switches to 20v but is not drawing any current. 0 amps.
Nothing is shorted.

Any help is appreciated.
Thank you

[mon2]

Logic board is LA-K411P?

[gurj1979]

Yes it is.

[mon2]

The schematics do not appear to be available. Carefully study the power path flow from the adapter to the charger IC. There should be a cluster of mosfets in the path. Measure how far the 20V travels onto the board. Respectively, share pics and details of where the 20V stops.

[gurj1979]

Power goes prettyuch to all the right places. I press power button, and the BLUE LED flashes once and turns on. I couldn't find a short anywhere. Nothing is getting hot on thermal camera, just normal temps.

[mon2]

Test with another bios. Backup the original first.

[gurj1979]

Would the BIOS get killed after the machine being put away for a year ?
The laptop never had BIOS update.

[gurj1979]

Actually - you might be right.....I did notice flux on the BIOS chip. I'll try reflash with another BIOS.