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Need a little help repairing a Toshiba Laptop

Discussion in 'Troubleshooting and Repair' started by Daniel Hodapp, Dec 31, 2015.

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  1. Daniel Hodapp

    Daniel Hodapp

    Dec 31, 2015
    Hello everyone,
    My brother recently tried to upgrade the ram on his laptop and somehow screwed up the motherboard power supply. The laptop worked fine off of battery power... until it ran out of power, but will not boot from the DC supply or charge the battery. The DC supply outputs a healthy 19.34 V and I believe it works fine. When probing the USB port while plugged in I get a strange result. Instead of a constant 5V, I get a constant 3.8V-4V that pulse up to 5V every second. If I plug in a USB led strip, it drops to 2.2V and still has a pulse every second to about 4.8V. I'll attach some photos of the data with and without the usb led strip.

    Without the led strip:
    This is with the led Strip:
    WithLEDStrip.jpg WithLEDStrip_CloseupofPulse.jpg

    Thanks Everyone!
  2. Daniel Hodapp

    Daniel Hodapp

    Dec 31, 2015
    On further inspection the main power trace looked like the images below, with the cut off every second. It looks like something is overloading and cutting off.
    MainPowerRail.jpg MainPowerSupply_2.jpg
  3. elebish


    Aug 16, 2013
    Substitute the power supply to eliminate that as the problem.
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