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Laptop PSU voltage loss when plugging into power port

Discussion in 'Laptops & Tablets' started by michty_me, Feb 8, 2020.

  1. michty_me

    Wise Guy

    Joined: Apr 19, 2012

    Posts: 2,476

    I’ve had my laptop switched on possibly 10-15 times since purchase in September but noticed that when I went to switch it on this time and plugged the PSU into the port, The LED on the PSU dimmed and within 30 seconds the laptop switched off. If I remember correctly, My laptop did have around 40% charge when it was shutdown a few days previously (When I was using it on battery).

    If I reset the PSU and not plug it in to the laptop, I am seeing a reading of 19.5VDC. When I plug the PSU into the laptop and the LED dims, I’m getting a reading of 0.8VDC until I physically power down the PSU brick and re-apply power. I assume this is a short protection feature?

    Now, I’m hoping it’s not the worst scenario of a motherboard issue.

    I’m guessing it could be a DC jack or possibly a battery short could cause this too?

    Has anyone seen this issue before?