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Sony Vaio laptop vgn-fs640-w problems

Very unusual problem....laptop will not boot up

when you power it on the dvd drives powers up, hard drive powers up and the lights all light up but the fan does not turn on and the screen does not turn on..........i took the laptop apart and looked for anything that looked bad..didnt see anything i then powered it up and the computer turned on and started to boot up fine and then the screen just went black and the hard drive was still on and dvd drive still on...fan was still on...i kept messing with it and now all i can get is the screen to come on somethimes but not to boot it just shows the sony splash screen and thats it...

could this be a bad processor??? prior to this the laptop would work ok and then freeze and shut down........it got more frequent and now i can only get it to boot up maybe 1 time out of 50 times.if i tap hard on the bottom of the motherboard i can get the screen to come on but it does not boot just goes to the sony splash screen and freezes there...and the fan does not power on.......

does the cpu tell the fan to power on..or should the fan come on as soon as laptop is turned on....when i can get it to boot it seems like the fan comes on once the pc starts botting up past the splash screen...

it uses a pentium centrino 1.6 ghz

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  • dcxguy48080 Jan 18, 2009

    yeah it does seem that way.......but would a processor cause that also or not really........from my experince a bad processor will be totally non functional i have never heard of a semi bad processor......

    this sucks because its a beautiful laptop........if it was not micro electroinics i could prob troubleshoot it.....but the compnents are so small you really can troubleshoot them.........oh well........i got it for 60.00 today im sure i can part it out for way more..the screen works great and the 80gb hd is good...the 512 ram is good...the dvd burner is good.......i think it is a bad solder or connection on the board....like you said......thanks ill part it out on ebay


  • dcxguy48080 Jan 18, 2009

    well i took it apart and its on ebay now in pieces lol

    thanks


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That happenedto me one time but i pressed the either the S1 or S2 button right bellow the speakers and the screen came back on.

Reply if this works for you, if not... Im sorry.

Posted on Aug 06, 2010

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The motherboard controls the fan speed - and laptops often turn it off entirely when it is not needed. This sounds like a motherboard issue where an internal trace is broken and sometimes it makes contact, other times not. There's probably nothing you can do except replace the motherboard.

Posted on Jan 18, 2009

  • fehknt Jan 18, 2009

    Yeah, a processor CAN be partly bad but I've only seen it once, and it was repeatable and got worse with heat. It's so much more likely that it's the motherboard that I wouldn't consider it worth trying.

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