Electronics > Repair

Dell XPS 15 motherboard sudden death, no clear sign

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Orsu:
Hello,

This is my first message on this board.

My 4-5ish years old dell xps 15 (laptop) suddenly died the other day. Irrelevant, but i opened a pdf file and it very suddenly stopped with no warnings or nothing.

I couldn't get it to boot again, so i tried unplugging the battery and the cmos and doing it again. To no avail.

The diagnostic LEDs (link, if it's useful to you: https://www.dell.com/support/kbdoc/en-us/000141206/a-reference-guide-to-the-xps-notebook-diagnostic-indicators) just stay white before stopping. Removing the RAM did got me the amber code indicating a memory problem, but plugging it back in didn't fix anything.

Plugged screens don't display anything, or detect a video signal.

I then stripped the motherboard of everything i could, and i see no obvious defect or problem.

I plugged it in and tried booting to see if there was an element getting particularly hot, and nothing.

The only thing i guess, is that when i removed some black tape there were bit of solder sticking to it, but they were just "there" not really soldered to an element.

What should i try? Am i cooked? Is providing pictures any help?


Thanks for suggestions, this (was) my daily driver, and i can't really afford a new one right now.

indeterminate:
Please list the exact model

Orsu:
It's a xps 15 7590

https://dl.dell.com/topicspdf/xps-15-7590-laptop_users-guide_en-us.pdf

I managed to find the same board, but this one has a different CPU on it. https://www.parts-people.com/index.php?action=item&id=31529

I can't tell for certain whether the cpu or some small component on the board has given up on life

indeterminate:
At a minimum you will need a multimeter , oscilloscope & fine probes.
you will need to get a copy of the schematics for your particular pcb unless you have a lot of spare time.

This is a very very complex and difficult thing to repair, the fact that it does sumthing when you press the power button gives you a place to start.
it could just be a simple fault in one of the power supplies

if you have a static safe work place and a 10x > 20x magnifier you could go looking for dry / cracked solder joints
you could be lucky.

Orsu:
Do you know of a repo where i could find schematics?

And so you would check each component one by one then ?

Yeah, time consuming, but let's say it's for reuse reduce recycle :(

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