Question about IBM ThinkPad T42 Notebook

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My T42 suddenly wont recharge the battery or wrk off mainsadapter

Suddenly my T42 stopped charging battery and wont work solely off mains adapter which is still ok and battery is fairly new...

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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.

Posted on Jan 04, 2009

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Posted on Jan 02, 2017

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Asus eee pc 1000ha wont take charge from adapter


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Hi, i have t42 lenovo. battery ran out and system shutdown. when i plugged in AC. my T42 is not booting up. Fan is running but nothing else.


First, you need to make sure your power adapter is providing enough power to both run the laptop & charge the battery. A very good way to do this is to compare your laptop voltage & ampere requirements (written on a sticker on the bottom of the laptop) with the voltage & ampere ratings of the power adapter. Voltages should be the same, or the power adapter's voltage about up to 0.5 volts more than the laptop's voltage rating. Amperage of the power adapter should be at least equal to or greater than the laptop's rating. It should never be less than the laptop's rating, or else the power adapter will be providing insufficient amperes to charge the battery. Of course, the power adapter's nominal amperage might be ok, but it degraded on usage. You can verify this by testing using a good or new power adapter.
If the battery did not charge using the new power adapter, take the battery off the laptop, & using a dry tooth brush, scrub in between the fins of the battery connector on the motherboard & on the battery it self, then put the battery back into the laptop & try again.
If this still did not resolve the problem, then the battery itself could be bad. Try it on another laptop, or try a good or new battery in your laptop.
If this did not work, there might be a possibility that the charging circuitry on the laptop's motherboard is defective & needs servicing. In order to do this, the laptop needs to be disassembled & the motherboard checked for defective/burned out components in the area near the DC jack. Any defective/burned out components found should be replaced, or you might need to replace the laptop's motherboard altogether.

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Laptop will only work when plugged into the mains, battery will not charge


your battery may be died or discharged comptletely and your power adapter are not charging.

get test the power adapter first, if it is ok, you should buy a new battery then
otherwise you should buy a new power adapter.

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Computer works on AC adapter but battery does not charge


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

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Advent 7113 doesn't detect mains


It is highly posible that the jack in your laptop where you plug the main dapter is making a false contcat due to a problem in the welding of its connectors to the main board or to corrosion. Check if the rentral plug is not loose or if the plugs seems to be loose when you plug it.
If it is so, you need some expert technician to solve the problem by re weilding it or replacing it.

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Power issues on HP DV1000


It is possible you have two dud batteries. Recharageable batteries have a limited life, they have a finite number of charge and discharge cycles.
With the battery removed and only the power supply connected and the laptop powered up, when you touch the connector on the laptop and the laptop does not shut down then the laptop connector is OK.

If you can verify your new battery is OK the the fault could be the power supply adapter, if may not produce enought current to run and charge the battery. Try charging the battery overnight by turning off the laptop and leaving on the mains t charge. Borrow a mains adapter and test it on your computer.

You can also check the BIOS setting for power management, ie. hibernate, low power shut down etc.


Dec 03, 2008 | HP Pavilion dv1000 Notebook

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