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Hi I have a IBM laptopT42 .... my problem is that the screen on the laptop will only stay on for a few seconds before it blanks out. Works fine on the external monitor. Can you tell me what needs to be done ..... Thanks

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Hi,

Based on your description, the problem could either be:

  • CCF (cold cathode florescent) lamp; and/or
  • inverter.
Since the T42 works fine attached to an external monitor, we can rule out the video card. Similarly, since the laptop's display shows (even if momentarily), then the video to LCD interface in all likelihood is also OK. Again, the display showing is significant, it tells us that the components are working except they stop for some reason and most likely it is heat related. Possibly a cold solder, a loose connection and/or a dried up capacitor. You could actually verify this be shining a flashlight diagonally across the screen (once the T42 has booted) and some semblance of the desktop albeit dark would be slightly visible.

What is required is opening the LCD lid/panel to perform repairs. This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 21, 2008

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