Hi,
I have a Dell XPS 13 (9343) with a power fault on the motherboard.
The laptop works fine from a charged battery, so the motherboard is mostly ok. However, it will not run, or charge the battery from the AC adapter.
So...
- It works fine from a charged battery.
- It detects the presence of an AC power supply, i.e. screen gets brighter and the BIOS reports "45 watt" against the power supply line in the BIOS, as opposed to "unknown" (when using some other non-dell supply) or "none" when it's removed.
- It doesn't draw any current from the power supply either to power the laptop or to charge the battery.
- I've tested the power supply with a separate load and it appears fine.
Closer inspection of the motherboard reveals a burnt out capacitor, just near an MDU1515 mosfet. It appears there are 3 capacitors in parallel (not 100% as I can't see the tracks, but the sides appear shorted, hence assuming they are in parallel).
The MDU1515 mosfet isn't shorted, though I guess that doesn't necessarily means it's ok either.
I'm thinking that the blown capacitor is symptom rather than cause, in part because I believe the 3 are in parallel.
The other 2 capacitors appear to behave like capacitors (in circuit, according to multimeter), hence assume (for now) that they are good. No easy way to determine the value that I know of other than to remove one and attempt to measure it in a tester.
I know the odds are rather long on repairing motherboards, especially with no schematic, but figured it's worth a punt as it feels like this should be fixable.
Photos attached (burnt capacitor, now missing, is the middle of the 3 to the left of the MDU12515).
Any thoughts welcome and appreciated.