Question about IBM ThinkPad R40 2897 Notebook

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Laptop's light is turning off!

Hello! I have a IBM R40 laptop. Unexpectedly, the comp screen goes VERY DARK...to the point where I cannot even see the cursor. It's almost as if its BLACK, but not pitch black. There is some visibility, but i cannot see where the cursor is. PLEASE HELp! Do i need to change the light bulb or something? The comp runs normally for only 5 mins when i turn it on, then after 5 mins, the comp screen goes dark and i cannot see anything...but the comp is still ON.

PLS HELP!

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  • Steve Rand
    Steve Rand May 11, 2010

    While on battery or mains? or both?

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This is going to be a problem with either the screen inverter, or the screen backlight. I would recommend have it diagnosed first to see which it is. You can test this yourself if you have an ohm meter, and a little technical know how.You will need to pull the screen bezel (the plastic piece around the front of the screen), the are screws hidden under the small round plastic sticky tabs on the bezel. Once you've removed the screws the bezel will snap off. Get it started at one side and work it up the rest of the way around, be careful not to break it ar the corners when lifting it off. Once the bezel is off you will see the inverter at the base of the screen. Power down the machine and disconnect the lead that goes to the screen. The power going into the inverter is very low, the inverter boosts the power back up to what the screen needs to work, so the power on the screen end will be significantly higher than the motherboard end. The voltage range differs machine to machine, so I can't tell you what it should be exactly, only that if it's the same or slightly higher from end to end, then it's bad. Now, inverters can be changed out, but backlight are part of the screen and cannot be change out. If it's a bad backlight, then the entire screen will need replaced.

Posted on Aug 22, 2008

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