Laptop power on problem

[riget]

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.

 

[Tmagic650]

Possibly a damaged motherboard...

 

[riget]

Possibly a damaged motherboard...

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

 

[ctriana921]

"Possibly a damaged motherboard..."

^this.

 

[Tmagic650]

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

 

[tipstir]

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.

 

[riget]

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

 

[Tmagic650]

The Laptop rechargeable battery or the motherboard CMOS Battery?

 

[riget]

The main rechargeable battery.