Question about IBM ThinkPad T42 Notebook

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Monitor blanks out / Laptop restarts

My laptop stays on for a few minutes and then the monitor seems to blank out. Only the battery(coz its plugged in) and the the one next to it ..the z symbol stays on. Dont know if it is a particular mode that it goes into..or something else is wrong..Any ideas?

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  • The problem seems to be the connection of the keyboard/mouse with the motherboard. When i use another mouse and keyboard connected to the laptop, it seems to be working fine.

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I have had the same issue with many IBM T4x series laptops. THE PROBLEM: BAD SOLDER ON THE VIDEO CHIP. SOLUTION: RE-FLO VIDEO CHIP
This is a way to test the Video Chip:
START WITH UNIT POWERED DOWN AND UNPLUGGED
1) remove the keyboard screws then lift up the keyboard enough to reach the video chip. DO NOT DIS-CONECT THE KEYBOARD FROM THE MOTHERBOARD2) Connect the power supply. Reach in and apply pressure to the video chip with one finger.3) As you continue to apply pressure to the video chip press the power on button to boot the laptop.If you SEE VIDEO on the screen while you are applying pressure and DO NOT SEE VIDEO when you remove pressure, the solder is bad on the video chip and will need re-flo.Search Google for "repair solder on IBM video chip" to see You Tube clips of how to re-flo IBM Video Chip.

Posted on Jan 13, 2012

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Z mean sleep or power save. Try to go to the power option in the control panel and turn off all energy saving options (monitor, harddisk, computer). It this works, you can leave the setting as is or you can adjust it accordig to your preference (ie, in battery mode turn off the monitor in 15 minutes...

Posted on May 22, 2007

  • Michael Ifurung May 24, 2007

    There is a very small switch near the keyboard that is activated when you close the screen. The action of the switch is programmable in the power management utility.

    Maybe this little switch is activated when you are using the keyboard. By default, when you close the LCD the computer will go to sleep mode to prevent overheating when the LCD is closed.

    What you can do is go again to the power management utility and disable the action of this switch. You will find a text that say 'action when the LCD is closed. The options are hibernate or sleep, power off, or do nothing. Thry to set to do nothing and observe the result.

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