Question about IBM ThinkPad R40 2681

4 Answers

Charging inconsistant Sometimes, charging works as it should. Other times, the battery runs down and won't recharge, even when left turned off and plugged in for a day. Have removed the battery and booted, then inserted the battery... did not solve it. Power supply is the 4.5A 02K6754 and does deliver 16v. Replaced the battery with a new one, problem persists.

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  • K7AAY Jan 28, 2008

    The power supply puts out a good 16v at the coax tip, so the supply and cord are OK. Its power is a coaxial plug and when run sans battery it runs fine, no
    problems. Therefore, it's got to be something after the plug/socket
    combo.

  • K7AAY Feb 25, 2008

    Bought a spare power supply at the time I got the laptop, Problem happens with both power supplies.

    Since I see the power indicator LED is on solid when plugged in, it's not the power supply socket.

  • K7AAY Mar 04, 2008

    I repeat:
    Since I see the power indicator LED is on solid when plugged in, it's not the power supply socket.

  • K7AAY Mar 09, 2008

    Since the laptop runs with no battery on the power adapter, as previously stated, it seems that power is getting through, does it not?

  • K7AAY Mar 13, 2008

    Here's more data. I can get the R40 to start charging the battery again by:
    1. Shutdown, power off.
    2. Remove power supply.
    3. Remove battery.
    4. Reinsert power supply.
    5. Power up, and press [ACCESS IBM] button before Windows starts to boot.
    6. Resave BIOS settings.
    7. Boot into Windows.
    8. Shutdown, power off.
    9. Reinsert battery.
    10. Power up, boot into Windows.


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I'm having similar problems on my R40 and I've seen a lot of references to similar problems when I had time to search. I have no idea what is causing the problem, but it's apparently quite common. I replaced my battery in January thinking it must be dying (had gradually crept down below 40% over a period of weeks, even while connected to power). The new battery quickly charged up to 100% and stayed there until I used it standalone last weekend. It got down to 40% and would not go up. I've removed it, cleaned contacts, etc, but no change. It will go down, of course, if I disconnect the plug, but it won't charge. Either ALL the batteries out there are bad, or many R40's have a defective charging system.

Posted on Mar 13, 2008

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Until you test the actual power pin you have no way of knowing that it (the pin) or the connection to the mother board isn't bad.

Posted on Mar 09, 2008

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Sounds like it could be the power pin/socket. Poorly designed at best. The day in and day out pulling and tugging takes it's toll on the poor little connector. I use a cable retention device liek the one in this video to keep my plug intact.

Posted on Mar 04, 2008

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Sounds like the power cable and/or it's connection is going bad. If it's the cable you can certainly replace it, though it may be costly. But if it's the connection on the machine, I've never seen a cost effective long term solution to the problem beyond buying a new laptop.

Posted on Jan 28, 2008

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  • Phil
    Phil Feb 25, 2008

    I always hate to order a new cord, and then find out it's the socket - maybe you can find a place in town that might have one in stock that you could return if the problem persists? A laptop fixing place might have one on hand that you can try and see, perhaps.

  • Phil
    Phil Feb 25, 2008

    Must be something with the charging mechanism itself. Unless you got a 2nd bum battery, which seems unlikely. I would check with Lenovo to see if there's been a recall of the unit because of problems like this.

    Sorry to have not been more helpful.

  • Phil
    Phil Mar 09, 2008

    As I said, unless you happened to get a 2nd bad battery, which seems unlikely, it must be the hardware within the laptop that charges the battery that is bad. If still under warranty, or if there is a recall of this particular unit, you can probably get it fixed. If not under warranty or recall, you'd have to pay, and it might not be worth the price.

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