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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Asus eee pc 1000ha wont take charge from adapter


try unplugging from the mains, remove the battery, hold the power button down for 30 seconds. plug the mains adapter in and try turning on. if it doesn't work then it's either the power socket or the mainboard.
if it does work, then try it again with the batter in. if it stops working then your battery's shot.

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Nc6000 multibay battery does not recharge


Perhaps remove the multi-bay battery, and let main battery charge all the way. Then reattach multi-bay battery, and see if it's recognized.
(Will charge)

That is AC adapter (Charger) removed, then remove multi-bay battery.
Plug AC adapter back into laptop, THEN plug AC adapter into power.

[You do Not want to unplug an AC adapter from a laptop, with the AC adapter plugged into power. Could be a power surge/voltage spike. Unplug AC adapter from power, when plugging into laptop, or unplugging from laptop ]

Main battery charged, unplug power to AC adapter, unplug AC adapter from laptop. Plug multi-bay battery in, then AC adapter.
(Then plug AC adapter into power)

Post back in a Comment.

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Acer model zlr wont work unless pluger in to charger cord


If the laptop battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all. OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time. If the battery drops to an unacceptable charge level then the battery needs to be replaced. Rechargeable batteries will fail if stored in a discharged state for long periods.

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Many users do not use their notebook/notebook batteries correctly. The battery in a laptop/notebook/netbook is a rechargeable battery, like the battery in a Cellphone, a Digital Camera an eReader or an MP3/MP4/MP5 Player. This type of battery needs to both charge and discharge, if it is to perform to its maximum capacity and have a full, long life.

You would never dream of using a Cellphone, Digital Camera, an eReader or an MP3/MP4/MP5 Player only with the devices permanently connected to the mains electricity, because they are all devices that are designed to be used while the user is moving around whether indoors or outdoors, powered by their rechargeable batteries. the batteries of such devices are only recharged when the charge in their cells is depleted and then only for as long as it takes to restore full charge to them.

As with the other devices mentioned, a laptop/notebook/netbook's battery is designed for mobile use and the user should charge it to 100% full and then stop charging it to then use the device on battery power alone, until the battery is low on power, when the recharging cycle can then be repeated.

A notebook/netbook has more flexibility than the other devices mentioned because, unlike the other devices, it can also be powered directly from the mains electricity, without the battery installed.

If your laptop/notebook/netbook is mainly used away from the home or office, it is fine to leave the battery permanently installed. If, however, it is mainly used indoors at home or at work and always or almost always on exactly the same desk or table, then it makes little sense to use it either on battery power alone or with the battery permanently installed.

Charge the battery up to full charge and then disconnect the battery from the device and keep it safely for when you next need to use the laptop/notebook/netbook on the move (if the battery is stored for long periods it may require additional recharging to both maintain the battery's condition and to keep it fully charged because low level power dissipation takes place in a disconnected battery). Then connect the device to the mains electricity without the battery and continue using it like that.

If the laptop/notebook/netbook is mainly used in a single permanent indoor location, then charging has to stop when the battery has reached 100% full charge and should only be resumed when the device gives a low battery charge warning.

It is also important not to let rechargeable batteries drain completely by ignoring the low battery charge warming and continuing to use the device until the battery runs out of charge and the device powers down suddenly. Sudden shutdowns like this are neither good for the battery nor the device and can shorten the lifespan of both.

Continuing to charge any rechargeable battery when it has already been fully charged damages and shortens the life of the battery. It can even damage the internal Power Management System of the device if done over a sustained period of time and/or for prolonged periods of time.

When your notebook only shows 75% as the maximum charging level, this is an indication that one or more (probably two) of the individual cells that make up the battery are fully depleted, damaged and probably no longer capable of storing a charge, for the reasons given above. You should stop charging this battery after it has reached 75%, otherwise more cells are likely to become damaged and so on until the entire battery is dead, unresponsive and useless.

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1 Answer

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make sure the battery is unplugged from the laptop and only hook up the ac adapter. If you can't get it to turn on then try anotherr knowng good working adapter and if it still can't turn on then the motherboard is bad and will need to be replaced.

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1 Answer

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

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1 Answer

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1 Answer

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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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