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Laptop power on problem

By riget
Mar 10, 2010
  1. Hi all, first the laptop is a toshiba u300
    the problem is I have to discharge the laptop every time before it will boot, by this I mean I have to, remove power adapter, remove battery and hold the on button for several seconds, another way I've found is if I hold a voltmeter to the + of a capacitor close to the power and battery connections, and to earth, I see the volts go from 12v up to 13v then down to 3v quickly, then down to below 2v a little slower, then the laptop will boot.
    I guess that a capacitor/s holding charge stop the laptop from booting, by discharging it/them, even by a voltmeter, the laptop then boots.

    Anyone have any idea's why this is.
    Thanks.
     
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 21,067   +169

    Possibly a damaged motherboard...
     
  3. riget

    riget TS Rookie Topic Starter

    Yes but I'm wanting to know what part of the mothrboard, and is it repairable.
    Also could it be the battery?
     
  4. ctriana921

    ctriana921 TS Rookie

    "Possibly a damaged motherboard..."

    ^this.
     
  5. Tmagic650

    Tmagic650 TS Ambassador Posts: 21,067   +169

    Some laptop CMOS batteries plug into the motherboard and some CMOS batteries are soldered in place. Both types can be replaced, but you have to have some soldering skills and equipment to replace the soldered in type
     
  6. tipstir

    tipstir TS Ambassador Posts: 4,761   +97

    Bad power switch
    Bad MOBO
    Bad PSU
    Bad adapter outlet

    Power switch can be easy to repair, but if you have another issue then the MOBO would be the best bet to replace.
     
  7. riget

    riget TS Rookie Topic Starter

    Thanks for the tips guys, but it was the battery.
     
  8. Tmagic650

    Tmagic650 TS Ambassador Posts: 21,067   +169

    The Laptop rechargeable battery or the motherboard CMOS Battery?
     
  9. riget

    riget TS Rookie Topic Starter

    The main rechargeable battery.
     
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