Question about Sony VAIO VGN-C140G/B Notebook

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Laptop screen flickers and goes off .

Hi,
Hope you can point me in the right direction.

I have a Sony Vaio (not sure of model as its at home) which developed a problem a few days ago.
The screen started to flicker and then went off.
After a lot of trying different things the summary is detailed below.
1) Running on battery all is ok except dimmer screen for power saving.
2) Plug in power adaptor and within 10 seconds the screen will flicker for a bit then go off.
3) The rest of the laptop seems to function ok as it will display on external monitor.
4) When power is removed screen will reactivate when changed back from monitor mode to laptop screen.

Many thanks in advance

Jim (Scotland)

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  • Sony Master
  • 32,281 Answers

You could have a faulty inverter but
You most likely have a defective CCFL backlight, it may have the following symptom:

  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display.
  • Picture flickering 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 replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, 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 and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

Posted on Apr 13, 2009

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Posted on Jan 02, 2017

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