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Tablet won't turn on or charge. How can i tell if it's the mainboard or the battery?

Discussion in 'Android Devices' started by xderpx0521, Apr 6, 2019.

  1. xderpx0521

    xderpx0521 Lurker
    Thread Starter

    I've got an android SM-T110 Samsung tablet that won't turn on and i'm a little stumped if the problem is with the battery or the motherboard. Is there an easy way to tell? Or is just replace the battery and hope the best the best course of action to take?

    I've got it plugged into a usb multimeter to measure the power draw, and it's taking in 0.4A. So there's some form of life in it at least. I tried booting it without the battery installed but no luck, it registers 0A. Any help would be greatly appreciated, cheers.
     



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  2. ocnbrze

    ocnbrze DON'T PANIC!!!!!!!!!

    welcome to AF!!!!!!!!!!!!!

    is the battery completely dead? did it have a full charge when this happened? have you tried other charging cables?
     
  3. xderpx0521

    xderpx0521 Lurker
    Thread Starter

    Thanks :3.
    I'm not too sure what the charge level was when this happened, I've tried another charging cable though and power point with no luck
     
  4. ocnbrze

    ocnbrze DON'T PANIC!!!!!!!!!

    how long are you letting it charge? if the battery was dead, then it will take longer to charge.
     
  5. mikedt

    mikedt 你好

    Do you have an ordinary multimeter with test leads on it? If so measure the volts straight across the battery + and -. If it's around 3.6V, then the battery has sufficient voltage and it's very likely the logic board is at fault.
     
    xderpx0521, tube517 and ocnbrze like this.
  6. Unforgiven

    Unforgiven ...eschew obfuscation...
    Moderator

    If the battery was completely discharged it will go into a safety mode and will charge extremely slow for the first 5% or so, and it may take several hours to reach that amount. I'm not versed in the technical jargon about it, but it has something to do with it being bad for modern battery designs to be nearly fully discharged. Depending on the device there may be no indication anything is happening during this time.

    You did get an indication there was some current flow, so I would let it sit overnight on the charger to eliminate this scenario.
     
    tube517 and ocnbrze like this.
  7. Deleted User

    Deleted User Guest

    Typically if theirs a LED on the tablet that turns on when it tries to charge thenvits not the mother board, it coukd he the battery but if sure enough that the battery us good then itcloukd be the usb port has gone bad thats my theory
     
    Unforgiven and ocnbrze like this.
  8. tube517

    tube517 Android Expert

    Ah, I had the same tablet. Very old.

    So you unplugged the battery and replugged it in and it still didn't boot up?

    That's basically the main solution for the Tab 3 screen of death.

    i would get a new tablet. That tablet has some very outdated specs and not worth the repair or battery replacement.
     
    ocnbrze likes this.
  9. xderpx0521

    xderpx0521 Lurker
    Thread Starter

    Success! The battery is rated 3.8v and is reading 3.9v. So it's definitely charged. I guess it's the logic board then that's gone.
     
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