SOURCE: ibm t42 display turns off as if I had shutdown
You can test the computer this way. Connect the video output at the back of the laptop's base to a known working monitor. If the problem disappears completely then you know it is a screen problem, mostly likely. But if the same thing happens with the known working monitor connected to the Thinkpad, then you very likely have the BGA problem, a part that was soldered less than well (due to the restriction of lead not being allowed in the solder due to government regulations). And it may also be caused by flexing the base due to moving the laptop with poor support for its weight and resulting motherboard flex on rather delicate microsoldering. There are several services that "reball" the Ball Grid Assembly, and there are motherboards available as well that can replace the non-working ones. This is not a cheap fix to undertake but it can be done.
SOURCE: How can I change or repair the DC Jack on an IBM
You have to completely disassemble the whole laptop in order to get to the motherboard & actually remove the original soldering to remove the DC power jack from the motherboard. One thing you need is the right tools (Screwdriver) and the soldering gun.
Google & research a guide for disassembling your IBM Thinkpad T42
SOURCE: IBM T42
Hi, This is a motherboard issue, this is a know issue on T42 you should contact Lenovo support to get a planar replacement. Thanks and have a nice day J-
SOURCE: ibm thinkpad t42 switch for wireless network
How do I get my wireless network on in my IBM T 42
SOURCE: my touchpad buttons don't work IBM T42 laptop
In this case you probably disabled it by mistake ..and you need to enable it again ..Go to control panel ..and locate the touch pad..and see if it needs enabling . If this will not work ..you have to download the driver for the touch pad..and reinstall it ..or ..if the driver is still in the system it is enough to get to control panel ..add hardware ..and run the add new hardware wizard..This will search for hardware and show the ones which are not installed or ..if no one is present ..select already added and look for the pad..
Or ..I would option for getting into device manager..(right click on computer ..select properties../hardware /device manager..or direct device manager for win7 ..)
in the device manager select the touch pad..and click right on it ..and select update driver..This will start the wizard and install the missing driver if it is still in the system ..If it isn't you will have to install it manually after you download it from the support site ..or from the disk .
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There's a fan controller chip on the motherboard. No, you won't be replacing it. (Chip and Chipset are slang terms for I.C. > Integrated Circuit) The chip is mounted on the motherboard with a BGA surface mount. Apply power again, wiggle the fan cable. Is there an intermittent short? No? Time for a new/used motherboard. {The Super I/O chip controls the fan. I don't know what Super I/O chip is on the ThinkPad T42 motherboard } Need the Service Manual for replacing the motherboard? (Free) Post in a Comment.
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