Connect an external monitor to your laptop, if you get a clear image on this monitor the the video card in the laptop is OK.
The fault could be a defective inverter that supplies high voltage to the CCFL lamp or a faulty CCFL lamp. Most likely a faulty CCFL lamp.
Defective CCFL backlight may has the following symptom:
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) as reached the end of the life and all you need to do is replacing the CCFL lamp
- 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.
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.