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Power button circuit seems dead (Android tablet). How to check it?

Discussion in 'Troubleshooting and Repair' started by gilga, Mar 18, 2017.

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  1. gilga

    gilga

    1
    0
    Mar 18, 2017
    Hi!

    I've got an Android tablet (discontinued Archos FamilyPad 2: https://www.europeanconsumerschoice.org/...).
    I've let it fall some time ago and now it can't turn on anymore.

    the symptoms:

    - Pressing Power On button: nothing happens, screens stays black.
    - Pressing reset, Power On for 10 sec, pressing Vol+ and Power On (as I've seen it can power on sometimes): nothing happens.
    - charging the tablet: there's a red light showing that it charges. I've tried to leave it for 2 days: it still can't turn on.
    - Plugging the usb to the PC (windows or Linux): the tablet is not detected.

    I've checked the battery with my multimeter, and it displays +4V. So I guess it's okay.
    [​IMG]
    [​IMG]
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    tECuKg5PnojUpPN3.huge.jpg View attachment 32705 pFpIuHTF2XNmVUo3.huge.jpg
    I think I should look at the power button itself and the circuit connected to it. I push the button, nothing works. How can I check where the problem is? Maybe trying to trigger the POWER signal without using the power button itself?

    IMG_20170318_105715.jpg

    IMG_20170318_105727.jpg

    IMG_20170318_105744.jpg
    [​IMG]
    [​IMG]
    [​IMG]


    Thanks a lot for your help!
     

    Attached Files:

    Last edited: Mar 18, 2017
  2. garublador

    garublador

    111
    43
    Oct 14, 2014
    You can check continuity across the buttons when left alone and then again when pressed to make sure the switches are working. My guess is they are.

    My experience is that most, if not all of the Android devices I've seen will power up when connected to external power and/or USB. If it isn't powering up then it's probably something else. Given that it doesn't show up as a USB device it probably isn't that the screen isn't working.
     
  3. Bluejets

    Bluejets

    4,219
    894
    Oct 5, 2014
    Voltage does not sound right. What is written on the batteries and what connection.
     
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