Question about Sony VAIO VGN-FS640W Notebook

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CMOS Battery My Sony Vaio laptop stopped working when you turn on the laptop nothing happens. Tested the hard drive on a friends Vaio and it booted ok and I tried my friend's hard drive on my Vaio with no luck. Connected an external monitor but again. The hard drive sounds as though it is spinning but nothing else on the system board works even a boot CD. Can you tell me if a Sony Vaio Model VGN-FS740/W has a CMOS Battery and where I can find it. The laptop was losing time and I recall update Bios message (or maybe it was my imagation). For the Product below the closest model was the FS640 but I have the FS740. I have the Back cover and the keyboard off but I can not find a CMOS Battery?

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  • YukonJack007 May 23, 2008

    looking for the cmos battery in sony vgn-fs640/w

  • barspan Aug 13, 2008

    i'm not getting the correct time, everytime. opened the laptop a couple of times but i just couldn't find where the cmos batt is. can anyone point me where to look for it? thanks a lot.

  • Anonymous Nov 25, 2008

    Yeah , same here .

    The machine will not boot.

    I assume is the CMOS battery but yet i can not find it .

    My machine is the same sony Vaio VGN-FS640/W .

    Please help!

  • barspan Dec 05, 2008

    My vaio used to exhibit the same problem that you guys had. After a few months of leaving it lying down, I thought to give this a try. Took out the battery entirely and just use the laptop with together with the AC adaptor all the time. Since then it never had a problem.

    Only thing is, the cmos batt needs replacement and i have opened my laptop for the nth time and i still couldn't find the damn cmos battery.



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You want to be looking for the rtc(real time clock) which is a little unit not much bigger than ur thumb to it youll find the battery(sometimes heat sealed with plastic.)if you remove this battery for about 5 mins then replace it or in ur case maybe renew it this will reset bios to factory(also method for bypass passwords as every thing is reset)
you might also wanna check ur video card.(connections and dust)

Posted on Mar 04, 2008

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I beat the laptop up and it worked!!! it was between the headphone jack and the keboard, in that area. 

Posted on Feb 25, 2009

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I have a problem. I guess free money or a new job would be an okay response from this post, but I am really hoping to get some information. I have a Sony Vaio VGN-FS640/W. I was on vacation, and when I returned the computer would shut down after every time the power cord was unplugged. It seemed as if there was no battery.

I chatted it up with the lovely customer service types at Sony, tried all the suggestions, and was assured that the next one would be the solution. Placation aside, which was nice and hope-inspiring, I am still at an impasse. The computer does not recognize that I even have a battery. I have tried all the "by-the-books" methods of troubleshooting. Can a battery die that suddenly? Should I take it to a service center of the Best Buy variety before mortgaging my non-existant house for a new battery? Thanks and I really appreciate any advice that I can get on the topic.

At Wit's End,

Posted on Apr 13, 2008

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