acer aspire 5542-1011 battery not recognized and unable to flash bios

moparguy55
moparguy55 Member Posts: 4 New User
edited March 2023 in 2017 Archives

Hello,

 

my laptop says battery not detected with a red x threw it. Googled a bit and apparently the fix is to upgrade the bios if its older than ver 1.06 which mine is. i downladed all 3 bios updates from the acer files and none will flash. i get an error saying "flash bios fail 0x4d0"

 

i have also tried shutting down taking battery out holding power button and reinstall battery and ac cord and rebooting. same thing battery not detected.

 

When i bought the machine from a computer store he said the battery was no good. Its been 2 months no and i bought a new battery to find out same thing. Any ideas what i can do ? \computer works fine other than not detecting the battery.

 

 

continuing on the hunt some said the dc output on the charger needs to match the dc input on the laptop. I thought it was an acer charger but looks like a chinese "hipro" the charger says 4.74A 19V  the laptop Dc input is 3.42A 19V. Could this be the issue ?

 

with a battery in it either the old or new when booting up i get a message and beep saying wrong battery could casue harm.

Answers

  • JackE
    JackE ACE Posts: 45,172 Trailblazer

    >>>i bought a new battery to find out same thing.>>>

     

    What battery did you buy? Model number? Specifically, what is its voltage output? Jack E/NJ

    Jack E/NJ

  • moparguy55
    moparguy55 Member Posts: 4 New User

    i bought AS09A75

    11.1V 4400mah 46wh

     

    wqas the same as w hat was in it that also gave the same problems. are you able to flash your bios?

  • JackE
    JackE ACE Posts: 45,172 Trailblazer

    Do NOT try to flash your bios before doing other tests!

     

    Have you checked the output voltage of the charger's plug with a multimeter? It should be at least 15 volts.

     

    Jack E/NJ 

    Jack E/NJ

  • moparguy55
    moparguy55 Member Posts: 4 New User
    I have not yet but will. Is it possible to have enough volts to run the laptop but not charge it?

    The battery light flashes orange when the battery is in.
  • JackE
    JackE ACE Posts: 45,172 Trailblazer

    Yes but in this case it's more likely due to a fault with the charger's voltage regulator. That is, the regulator isn't sensing the battery's voltage correctly. Accordingly, the battery's built-in chip control circuitry would shut down to protect the battery from a charger over-voltage. Jack E/NJ  

    Jack E/NJ

  • moparguy55
    moparguy55 Member Posts: 4 New User
    What would you recommend for a charger for this Acer laptop? When I bought it I didn't notice that it wasn't the factory charger.
  • JackE
    JackE ACE Posts: 45,172 Trailblazer

    Like HDDs, DVDs, CPUs and other peripherals made by others, it's not unusual to find the same thing for an AC adapter shipped with a new system from most PC vendors. Your particular model came with either a 90- or 65-watt 19v charger. So I'd guess your charger was probably the original 90-watter. At this point, I suspect its voltage sensor/regulator is shot and might be trying charge an 11v Li-ion battery with its full 19v capability --- the battery's control chip shouldn't allow that to happen to due the hazard.

     

    New charger replacements are less than $15 with free shipping. If it were mine, it'd be worth a try. Just google or search ebay or amazon for "aspire 5542 charger" and pick a vendor you feel most comfortable with. Either wattage should be fine. 

     

    Jack E/NJ

     

    PS: Don't mess with the bios. You could wind up bricking the machine if the flash process goes haywire.  

         

    Jack E/NJ