Question about IBM ThinkPad T42 Notebook

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Computer works on AC adapter but battery does not charge

I have an IBM Thinkpad T42 that works perfectly except that the battery will not charge. I Have tried two batteries and neither work. When first plugged in the battery indicator will blink for a while, then turn solid yellow, but the battery never charges. I installed a program called Battery Status v0.98 beta that does not recognize either battery whne they are installed. The Battery MaxiMizer Gage is blank. I was told on one forum that there is a fuse between the system board and the battery that might be blown

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  • rick2210800 May 29, 2009

    "hi,there might be the issue with dc in cable(cable from jack to m/b) ..."

    Please be more specific. What sort of issue?


    "... or the inverter board."

    Isn't the inverter board part of the LCD assembly? What would this have to do with the battery not charging?

    Everything works on this computer. The only problem is that the battery will not charge. I have tried a 2nd battery with the same result.


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  • 479 Answers

Hi,there might be the issue with dc in cable(cable from jack to m/b) or the inverter board.

Posted on May 29, 2009

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Hello....those T40 series laptops which I use to support at a previous job. They would often develop these same issues. We would often keep them in stock because after a while the batteries just don't hold a charge. Its not that the laptop is not charging them. The battery simply does not hold the charge.

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The Thinkpad T42 doesn't have a reset button on it like the older IBM's used to.

There could be a problem with the battery. With the machine turned off remove AC power and then the battery. Plug in AC power again and see if the laptop will boot without the battery.
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Please post back if you need anymore advice.


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The most common reason is memory.

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The only way is to continue using it that way till it will not go off when you unplug.

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It seems the hard disk size will max out at 80GB with a 5,400 RPM speed according to IBM.

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1 Answer

My T42 suddenly wont recharge the battery or wrk off mainsadapter


If the Laptop wont work off the power adepter, it also will not charge. The adepter could be bad (even if showing a power light) or the connector on the laptop could be broken. The best test is to take the battery out, attach the power adepter and try to start the computer if it starts, your battery is at fault. If nothing, suspect eh charger first. Be sure the pin on the Laptop power connector isn't bent or broken.

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