Toshiba Qosmio F50 does not turn on

Is there something like safety device in Qosmio F50?
The problem is it does not turn on either from constant-current source or from battery.
What can be wrong?
Nothing happens after pushing power on button.
What can I try to do myself before applying to service center?
Thank you for any help.
Evgeniy ShakhovskeyAsked:
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Make sure your ac adapter isn't dead.  You'll need a voltimeter to check the voltage and amps.  But if it's giving good power and still not turning on, odds are your laptop is dead.

Most likely motherboard or charging board issue.  Charging board was a big issue in these Toshiba's.  But to answer your first question, no, there is no safety device.  If it has power, it should turn on.

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buy or borrow another AC Adapter with the same voltage and test if it starts (if there is an indicater light on it -does it light up)
if the AC adapter or the charging circuits are  bad, the battery won't charge, resulting in a seemingly dead laptop
all AC adapters have the voltage and current printed on it - 19.5 V in most cases
After you confirm the AC adapter is good.

I think you may have a bad DC power jack.

If the power jack has a bad solder joint the what happed was you were not geting and DC power to charge up your battery, and you used up all your  battery and now it will not start from battery or ac adapter.

Of course the same thing could happen if your AC adapter is bad.

Please see my article on how to check and repair your DC power jack.

all so here is my article on how to test your AC adapter .  .
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Grant1842 is also correct.  I remember a lot of Toshiba's coming in to my old tech shop that would have a bad DC Jack that the solder broke on.  The only problem is, re-soldering it isn't as reliable as replacing it with a new one but it will work in the short term.
Evgeniy ShakhovskeyAuthor Commented:
The question is how to disassemble notebook?
first  - nothing is sure yet, so it can be someting else

here the service manual :
Evgeniy ShakhovskeyAuthor Commented:
Thank you all!
I think I would better send the notebook to the repair service :)
I'm not sure I'm able to disassemble and assemble notebook myself :)
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