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RedBauble@sh.itjust.works ⁨4⁩ ⁨weeks⁩ ago

Does the power supply turn off, entering short circuit protection, when plugged into the laptop? If so some capacitors on the supply line may be shorted. Usually they are all in parallel so to find which one is shorted go by trial and error: remove each shorted cap test continuity outside the mobo. If it beeps it’s dead. You should be able to power the laptop without that cap.

Note that caps under/behind the CPU/GPU appear shorted even if they are working when the laptop is off, do not touch them

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UnH1ng3d@lemmy.world ⁨4⁩ ⁨weeks⁩ ago
That’s a great tip, but unfortunately the power supply is not turning off. I will refer to this next time though 👌

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bitfucker@programming.dev ⁨4⁩ ⁨weeks⁩ ago
Is it because of the very low ESR of the caps that it appears shorted?

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- RedBauble@sh.itjust.works ⁨3⁩ ⁨weeks⁩ ago
  No, it’s because, in the very specific fault I described, at least one of the caps on the supply line are actually shorted. I don’t know how rare it is, I’ve had it happen on a couple laptops, both Dell now that I think about it
  
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  - bitfucker@programming.dev ⁨3⁩ ⁨weeks⁩ ago
    Oh no, I mean the caps under CPU/GPU sorry
    
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    RedBauble@sh.itjust.works ⁨3⁩ ⁨weeks⁩ ago
    I actually never investigated. My guess would be yes
    
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