Loud pop then black screen. Afraid of turing on again.

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Dell XPS 15 9570

A high end laptop, made from Aluminum and Carbon fibre chassis, that Dell manufactured in 2018.

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Anders @zoneknud

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Loud pop then black screen. Afraid of turing on again.

Hello, brilliant minds.

Yesterday morning I installed a new original Dell battery in my XPS 9570.

In the evening I was watching some video and then heard a somewhat loud POP, and then my screen turned black/the computer shut off immediately.

I pulled out the DC jack, opened the laptop, and disconnected the new battery.

I measure 3 ohms and 7.9 ohms when probing the highlighted and nearby components, which I believe are capacitors. Would that be a short? I cannot find any other places where I measure such low resistance over a cap.

How should I proceed? Can I damage the laptop any further by connecting power? Can my new battery have caused this, if so how? Would I be best off just taking the laptop to professionals?

Edit:

I found a schematic, but I do not know what the powerline is for.

Edit 2:

Pictures of motherboard

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That first photo, with the highlighted components... zooming in on that fifth "H883419YC" part of that chip, just above the "9" and "Y" looks like a cracked / popped chip, but could just be the photo... can you please post another close-up photo of that one?

由 Barrie 完成的 2023年1月8日

@automotive Thank you for taking a look. However, I don't think it's a cracked chip. I have added a close-up picture of it.

由 Anders 完成的 2023年1月8日

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That first photo, with the highlighted components... zooming in on that fifth "H883419YC" part of that chip, just above the "9" and "Y" looks like a cracked / popped chip, but could just be the photo... can you please post another close-up photo of that one? — Barrie
@automotive Thank you for taking a look. However, I don't think it's a cracked chip. I have added a close-up picture of it. — Anders

score 2 · Answer 1 · 2023-01-07T05:04:09-07:00

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Geir Ove Andersen @geirandersen

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@zoneknud, The first thing to do, you already did; Remove all forms of power!

Next you’ll want to remove all boards (logic board and all daughters boards) and inspect both sides of them for burn marks, scorched or singed traces, etc. A loud popping noice is usually caused by a blown capacitor or a blown mosfet.

If you take your boards out and take some good quality, up close and high resolution pictures (remember good lighting) and update your question using Adding images to existing questions, we can see what you see. This helps us in helping you

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I have added images.

由 Anders 完成的 2023年1月7日

@zoneknud I can’t see anything obvious in those pictures, and as @flannelist said, I don’t think it’s beyond the realm of possibilities those readings are correct on the power rail to ground.

Make sure you inspect both sides og all boards for damage.

You could try powering up without battery, but I’d be very careful and weary doing it!

There almost certainly HAS to be visible damage somewhere when hearing a loud pop. If a good once over with a magnifying glass shows nothing, next step is to visually inspect all components with same magnifier as some of those caps can break in “weird” ways.

由 Geir Ove Andersen 完成的 2023年1月7日

@geirandersen Sometimes changing your viewing angle makes all the difference. Especially with capacitors. I have missed obviously cracked caps before because the crack was in a spot you would never see looking straight down.

由 Alisha C 完成的 2023年1月7日

@flannelist I have done exactly the same, more than once. The worst one to find was one that had cracked on the underside, almost not visible on the side even so I had a bugger of a time finding it!

由 Geir Ove Andersen 完成的 2023年1月7日

@geirandersen

A loud pop doesn't always have to be a blown capacitor or mosfet.

It could also just be the sound from the speakers when the power is suddenly disconnected, more so if there was audio from the speakers at the time.

If the OP has the schematic it should have the power rail voltages from startup so they may have to start at the beginning and start checking voltages to see which one is not there

由 jayeff 完成的 2023年1月7日

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Alisha C @flannelist 声誉积分: 32.6千 24 35 32 · Answer 2 · 2023-01-07T05:59:37-07:00

Alisha C @flannelist

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In addition to what @geirandersen has said. The Power rail is labeled as VCCGT. Which is a power rail for the CPU. Those typically have a low resistance to ground, so I'm not entirely sure I would be concerned. That's pretty low. But not unheard of for similar rails.

If there was a loud pop, there is almost certainly some kind of visible damage. It's possible the new battery caused it if it was not the correct battery, or the battery was faulty, but it's also possible the timing was just a coincidence.

You will definitely want to give the whole board a good once over. Remove the heat sink even since it's possible the issue is under it.

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I have removed the heat sink and inspected the entire motherboard under a magnifying glass. I can't find any burn marks, blown caps, or other visible damage.

Can I damage the laptop further by trying to turn it on only with DC power, RAM and the screen connected?

由 Anders 完成的 2023年1月7日

@zoneknud It’s possible, depending on what the issue is. But it may be worth a go regardless. I would probably try just to see. But I live dangerously with my own equipment. It’s already not working. And if you’ve yanked your drive then no risk to your data.

由 Alisha C 完成的 2023年1月7日

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Dell XPS 15 9570

Loud pop then black screen. Afraid of turing on again.

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