Question about Toshiba Satellite P15-S420 Notebook

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Strange ac cord/power issues

More strange power issues with a toshiba P15-S420: when i plug in the ac adapter both led's on the front end of the laptop light up (there are two, one showing that the ac cord is plugged in, and one showing either the battery charging [orange], or the battery full [green]. if i then open the power management it shows that the ac adapter is plugged in and the battery is charging. the problem occurs when the battery gets to 100% full. the power management will still show that the ac adapter is plugged in, but the battery is discharging. and the led that shows that the ac cord is plugged in stays illuminated, but the one that shows the battery either charging or full goes off (contradictorarily insinuating that the ac cord is not plugged in). any insights?

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  • fallenangelf Apr 20, 2009

    just wanted to add that i just spent some time perusing, and quite a few people were having the same problem. the "expert" there says that it is a faulty battery charging circuit on the motherboard, and the whole motherboard needs replacing. another person replied saying that he believes it is a problem in power management because when the computer is started up in safe mode everything works fine; which i have found to be true for me as well. second opinions?

  • fallenangelf Apr 20, 2009

    yes, i [i]do[/i] leave it plugged in and let the battery discharge, and it goes all the way down to zero and shuts down (as you would expect it to if it had no power supply- not the proper way). i then have to take the ac cord out of the jack in the computer for a while and plug it back in later until it will start charging again.
    on a side note- this started happening to me a couple weeks ago, and i just kinda set the laptop aside and forgot about it for a while. today i decided to try to tackle this problem and it is still doing the same thing, but now it will charge up to 100% and stay like that for a while (maybe 20 minutes) before discharging again. odd . .

  • fallenangelf Apr 22, 2009

    ok, first some history on this laptop. i bought it used off a friend. first thing i did was reformat with a new copy of windows xp i bought a couple years ago and never used. this obviously wiped out all the toshiba drivers, so i downloaded all the newest versions of the drivers from toshiba's website for this specific model and installed them, so i should have the newest version of the APCI driver.

  • fallenangelf Apr 22, 2009

    also, wondering if there is another place to download drivers free of charge other than toshiba's site. all of the sudden i can't find the model number of my laptop and suspect that they stopped hosting the drivers because it's an older model.

  • fallenangelf Apr 24, 2009

    yup. those are some of the utilities/drives that i've already downloaded and installed. as to the correct amperage, i'm using the ac adapter that came in the box with the laptop when it was bought. thanx for the attempt, though.

  • Steve Rand
    Steve Rand May 11, 2010

    A small warning about power supplies:

    ACPI BIOS update (v2.0)

    Power management utility:

    Toshiba E-Key (required for power management utility)

    So make sure your powersupply is the correct voltage and amperage, install the utilities and update the BIOS. It might not fix the problem, but it won't do any harm!

  • Steve Rand
    Steve Rand May 11, 2010

    Ah ok... i'm not sure what would cause this to happen... I'd take a guess at either some kind of APCI driver issue (since it happens in normal, not safe mode) or possibly a partially-faulty powersupply.

    For an ACPI issue, it would need a fair bit of "hands-on" investigation... and while I haven't met a PC problem that I couldn't solve, it's only possible if i'm infront of it.

    I'd start with using a spare hard disk (which you probably don't have) and installing windows with no drivers... that should work... as it would be similar to safe mode. Then, i'd get the latest ACPI driver from Toshiba or Microsoft and retest again... etc.

  • Steve Rand
    Steve Rand May 11, 2010

    Just for funsies... can you leave it plugged in and let the battery discharge? If you could try that... let me know if it starts charging again when it hits around 70%.



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  • 555 Answers

Hello my friend, Try to check your battery if the is it working normal cause sometimes the battery itself has the problem its either lost contact or the battery is not charging or not normal. also try to see if the the the sensor or that links the battery to the software which is responsible to the update of charging energy is functioning normal but this is a rare possibility try to focus on the battery or the connector or power cord.
Hope this will able to help solve you problem. If you need more assistance just reply to this post. Thank you

Posted on Jul 09, 2009


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