Laptop Battery draining even when plugged in.

Discussion in 'PC Hardware' started by f9t0, May 28, 2016.

  1. f9t0

    f9t0 MDL Novice

    May 26, 2016
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    I have a clevo m761tu laptop since 2007. For a month now i am facing this problem: The laptop uses battery even when it's power cable is plugged in (so i have limited time to use it). If i remove the battery it uses power from the cable (but if it disconnects even for a second it shuts down). There is an indicator that lights up orange color when the laptop is receiving power, even when it is powered off. With the battery removed and the cable plugged in, the indicator is ON. If i connect the battery the indicator goes OFF.
    This happened from one day to another and i still have not figured out why. I did not do any major software change (not that it would matter).
    The battery is fairly new less than 6 months, and the problem persists if i use the older battery (i changed because old battery was not lasting long enough).
    The power does charge extremely slow if the laptop is connected and powered off (indicator is still OFF). Takes around 2 days to charge fully.
    I think that there is something wrong with the charger (but then again why does it work without the battery) or some chip inside that has something to do with the charging just went bye-bye (maybe due to power outage i don't know). I would buy another charger but these things are expensive for old computers and i won't do it unless i am sure that it will fix the problem. I tried disconnecting and reconnecting all cables on charger and it seems OK. It's got a green light that turns ON when when i connect it to power.

    Sorry for bad english, i tried to describe as best i could. I will update if anything else comes along.
     
  2. pisthai

    pisthai Imperfect Human

    Jul 29, 2009
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    That seems to be a problem with the Power Regulator (maybe), an internal part of the Laptop! Because of the slow charge, of not so old Batteries, I think that's the culprit!

    If you know, firstly how to open up the Laptop case to reach the MB and internal parts, secondly could identify the Power Regulator and thirdly how to check the components, you could try on your own. Take special a close look at all Capacitors!! Capacitors are vital for power to work correctly. If some of those a looking not normal, they should be changed, with some of the exact same spec!

    Because of the age of that laptop, it may would be difficult (and expensive) to get a replacement of the Power Regulator. The question overall is: is it worth for that 9 years old machine?
     
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  3. Flipp3r

    Flipp3r MDL Expert

    Feb 11, 2009
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    Check your using the correct adapter. ie under the notebook it should state something like 19volts at 4.9amps.
    You may be using an adapter that's 19volts but only 3.4amps.
    Sometimes it's easy to make that mistake if you've got a lot of devices/adapters laying around...
     
  4. bpwnes

    bpwnes MDL Member

    Aug 11, 2015
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    It could be the charger. Perhaps something is wrong with it and it isn't outputting enough amps. It would be a good idea to try another charger and see if that fixes the problem.
     
  5. johnseward

    johnseward MDL Novice

    May 30, 2016
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    In case you have an IBM they use a technology that slowly discharges the battery while plugged in Or Measure the voltage with a voltmeter
    CertifyGuide – The Ultimate Source of Certification Exam Preparation Guides
     
  6. f9t0

    f9t0 MDL Novice

    May 26, 2016
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    i am almost positive that the problem is not from the charger, because it works fine with the cable attached and the battery disconnected. I have the correct charger (although not the original i have a new one ~ 5 yrs). both the charger and the laptop say 19.0 V , 4.74 A. This problem occured from one day to another. I tried discharging and recharging the battery multiple times. Could this be caused by dust??
    @pisthai i can easily open the case but i cannot identify the regulator; How can i tell if capacitors are working correctly?
    I am hesitating to buy another charger, since they are expensive (last one cost around 30 euros and i had to make special order for it) and if the problem is not in the charger, i have wasted the money and did not fix the problem. If the problem is an internal circuit or a chip or something like that, i will never find replace parts. By the way i have nothing more than screwdriver, i will search for voltmeter.
     
  7. MrMagic

    MrMagic MDL Guru

    Feb 13, 2012
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    Charging circuit in the laptop could be dead / dying

    Charger could be dying

    Only way to know is to try another charger
     
  8. tonto11

    tonto11 MDL Addicted

    Jun 18, 2012
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    Had a similar prob with old Dells. The backup cmos battery is a rechargeable, not a coin cell.
    when one or more elements of this battery fail it can never recharge, so it tries to do so continuously
    consequently killing the main battery. Interim remedy was remove the main battery when not using the computer.
    When you do this the computer loses it's time setting among other things, so you know the backup battery is not functioning.


    ...T
     
  9. LatinMcG

    LatinMcG Bios Borker

    Feb 27, 2011
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    take power and batery out, hold power button 30 secs.. now retry.
    sometimes EC goes crazy and does similar.. and wifi not working? same.
     
  10. pisthai

    pisthai Imperfect Human

    Jul 29, 2009
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  11. T-S

    T-S MDL Guru

    Dec 14, 2012
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    I suggest to look for the instructions of your notebook.

    Many notebooks have a function to disable the battery charging (say on many Dells it's FN+F2/FN+F3) to spare its life.

    Thinkpads have the dedicated battery app, but likely many other makers cloned this Thinkpad's feature, just like Dell did.
     
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  12. f9t0

    f9t0 MDL Novice

    May 26, 2016
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    the service manual did not help much. it only contained information about upgrading HDD/RAM/CPU. Power regulator is working fine. i asked a tech guy that said it's probably the charger. I will order a new one (might take a few days) and try. I will post the result and ask further advise.
     
  13. f9t0

    f9t0 MDL Novice

    May 26, 2016
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    UPDATE:
    Tried a new charging cable with no luck :( Being unable to locate the faulty piece, I left the laptop to a repair service and told them all I read here as they may help him locate the problem. He said there is a component that switches from cable to battery power and that might be the problem; He was very assuring that he can easily find repair parts if he can locate the problem. So much for repairing it on my own..... anyway thank you for the advise
     
  14. f9t0

    f9t0 MDL Novice

    May 26, 2016
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    Problem Solved!! Service repaired it. The switch that changes between charger power and battery power was damaged. Took them a while to find replacement but it is ok now. Keep this in mind if you encounter a similar problem. Thanks everyone.
     
  15. MS_User

    MS_User MDL Guru

    Nov 30, 2014
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    try this go to best buy if theirs one in your area and test it with one of their chargers if it checks out your chargers is bad and u need to replace it....if u get the same issue u have at home your connector in motherboard is bad....dont worry they dont charge at the store for that. also your battery mite be bad already 2007 thats pretty much out of warranty.
     
  16. illusionleague

    illusionleague MDL Novice

    Nov 30, 2015
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    I agree, your charger might just be acting as a regular power cable.
     
  17. Joe C

    Joe C MDL Guru

    Jan 12, 2012
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    Not sure if Greece has a best buy but I had a Dell 1525 laptop that refused to charge the battery with new battery and charger, So I went up to a local repair shop and they tried another battery and charger to verify that what I had was o.k. Was free just to have that checked
     
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  18. T-S

    T-S MDL Guru

    Dec 14, 2012
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    Dells have a check in the bios for original chargers. If the charger is not original they charge veryyyy sloooowly. You can disable that check.
     
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  19. Joe C

    Joe C MDL Guru

    Jan 12, 2012
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    Nope.... the bios stated "unknown device" and refused to let the power brick charge up the battery, after some googling I replaced a daughter board for the charging port and after I did that it was recognized in the bios as a 90w charger and started working. This little daughter board with the charge port was $10. with shipping on ebay.

    Weird thing was that the power brick would operate the laptop, only refused to charge a new battery so it was always at 0%
     
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