Sony VGN FS660 LCD back-light works most of the time, then flickers on and off and sometimes goes out altogether. Usually works fine for the first hour.

Fault with the main power supply regulator board. Ubnormal DC voltage output from it. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and precious time.

Sale price: $1,289.99 - You Save 34% Availability: Usually ships the same business day. Quantity:
convert it to Indian price

http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNFS660W&upd_id=1746&os_id=7

better u get it from sony vaio website.

You may have a defective CCFL backlight, it may have the following symptom: Screen flashes on and off or displays reddish pink hue. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickers on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replace the CCFL lamp.
To determine if the video card or the LCD is faulty, connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight. It could be a faulty inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out, usually the CCFL lamp fails before the inverter.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out LCD Parts for service, parts, and DIY info Use this link to their WEB site: -
www.ladparts.net

Sounds like you need your original drivers

Click below, select your operating system and what driver you want

http://esupport.sony.com/US/perl/swu-list.pl?mdl=VGNFS660

If this helps, click YES below.

dear kenkasza, i am afraid that you will lose the warranty if you open ya laptop all by yourself.

Hi sailor285,

Here is a website address that has the battery that you need for less than $80 US.

http://www.laptopbatterystore.com/product/2201/sony-vaio-vgn-fs660-w-batteries?mr:trackingCode=AC20F2D0-0CAD-DD11-A65F-0019B9C2BEFD&mr:referralID=NA

Hope that helps...

Take Care,

Michael

Correction...

The CMOS battery is located under the system board, and is not accessible from under the keyboard.

The keyboard has to be removed in order to change the CMOS batter, (another reason why I don't like Sony laptops.)

Below is the batter I just pulled from a user's VGN-FS660\W

Possible power cable fault, hard to tell really, especially if you ran the laptop battery flat, but it may be a flat cmos (bios) motherboard battery, also check that the hibernate switch where you close your laptop lid is not stuck down as this will dissable power up.