Question about Dell Inspiron 6400 Notebook

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Screen dead as a dodo - and its not inverter or backlight - HELP

Hi, and thanks in advance for any assistance.
In a nutshell:
Out of warranty
Screen dead.
Video card is ok as external output to monitor works.
Have changed both the inverter, cable and backlight and still no joy.
What else could it be? How can I test inverter or backlight?


Posted by on

  • Sean  Hughes
    Sean Hughes Aug 07, 2008

    Cheers for reply. Cant be motherboard. There is an image on the screen itself , problem is the backlight does not light up. I have tried 2 other compatible inverters, the vid cable and changed the backlight but no joy.
    I know its a process of elimination but dont know how to test the voltage getting through to the inverter or to test the backlight?


2 Answers

Many thanks, will give that a go now and let u know how i get on

Posted on Aug 07, 2008

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Only two things left. The screen itself or the connection on the motherboard. I believe the problem is going to be with a dead screen, so, replace the screen. If this doesn't do it, then I'm afraid the motherboard connection may have failed, and I'm sure you know what that means.

Posted on Aug 07, 2008

  • Ryan Rogers
    Ryan Rogers Aug 07, 2008

    On the inverter, you should be able to test it with an ohm meter. The inverter boosts the power from the board, back up to the level required by the screen, I couldn't tell you the exact voltage, only that on the screen side of the inverter the voltage will be comparable to the power of the wall outlet. The backlight can't really be tested, it either works or it doesn't when power is applied. Don't completely rule out the motherboard connection yet, I've had machines through my shop that seemingly had an inverter issue, that turned out to be that the pins in the motherboard connector that the inverter receives power through via the screen ribbon/cable, were damaged or corroded. Cleaning the corrosion from the pins fixed several, but the ones with damaged pins i had to get new motherboards for.


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