Electronics > Repair
Dell XPS 15 motherboard sudden death, no clear sign
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Orsu:
I plugged in a psu with amperage, and after pushing a button i got either 0.1A, 0.3A and no lights, or 1.5A,1.6A and some activity (blinking lights, fan turning on)

Just plugging, like 0.1A, oscillating to 0.0A (i guess it's just under what it can measure)

Which mosfets are you talking about? Starting from the power side?

I found a schematic, i think it's the correct one: https://drive.google.com/file/d/1GLOYRT8I6JDVwMpKhGZAXKU5zy4qnRrr/view (LA-H331P)

I took the cleanest pictures i could, i'll document what i do as i do it

Thanks
u666sa:
Fan turning on is good, main power rail not shorted. First two mosfets are good.

What you got there controlling power? BQ chip? Find which one you have, find datasheet, and check for voltages on it.

The above is important.

Meanwhile



Measure resistance to ground on all the coils.
Orsu:
I picked up the mobo to work on it the other day, and it somehow got worse by itself, the lights don't turn on anymore

I'll some more later

Orsu:
While probbing around, something shorted very clearly and a smd cap melted. Maybe someday i'll try to do something using a thermal camera and whatnot, but right now i don't understand the schematics i found, i don't have any of the replacement smd components around, and i cannot spend much more time on the board fruitlessly.

So i gave up and ordered a replacement one from Aliexpress, because it was the cheapest option available to me.

I will update the thread if it turns out to have been the good choice.


Thanks everyone
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