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Headphones keep looking for Bluetooth connection, while connected - trying to figure this out.

Discussion in 'Troubleshooting and Repair' started by WarpStar, May 17, 2019.

  1. WarpStar

    WarpStar

    2
    0
    May 17, 2019
    First things first, they look like Beats, but I’m pretty certain these are knockoffs. Nonetheless, they sound pretty good, and I picked them up at Goodwill for a steal and love a challenge, so if someone is interested on taking on this electronics mystery with me I’d be incredibly grateful.

    Context: I’ve tinkered on and off with consumer electronics for a while now, am okay at soldering and have an okay knowledge of how more basic circuits work. Otherwise, I'm pretty beginner but generally a quick learner and would be happy to try any of your suggestions.

    The previous owner attempted to replace the AAA battery holding component with a rechargeable lithium ion battery - only problem was there was no way to charge the battery. Not a huge deal, fixed the headphones to run on AAAs again as they were originally intended. That said, pressing and holding the power button powers the headphones on, but also is the Bluetooth connection button on the board (image at the imgur link below) there is an icon for both the connection functionality and the power around the same button. The headphones power on, work, and sound great when you're holding the button down, but once you let go they turn off. So, it’s a momentary switch with no latch to keep it held down - not ideal.

    That said, I’ve tested jumping the switch so it gets constant power without holding the button down, and while the headphones power on, connect to my phone, and work, because it seems the power button and bluetooth button are one in the same, the headphones continue to look for Bluetooth devices and makes a periodic and infuriating beeping sound about every fifteen seconds. Based on the pictures of the board, and the schematic at the link below (board pictured with, and without button attached) can anyone figure out what the problem might be? Or point me in the right direction for further tests to run?

    Someone on another forum has suggested a grounded button that connects to the WAKE pin on the schematic, but even bridging the button to the WAKE pin results in the same beeping sound, unless I'm doing that wrong.

    Hope this post provides helpful information, please let me know if there is any information to help y'all. Incredibly grateful for your assistance.

    Front of the board, with buttons.

    Front of the board, with power/bluetooth button removed

    Back of the board, showing the Bluetooth sub-board

    Datasheet for the Bluetooth board
     
    Last edited: May 17, 2019
  2. Tha fios agaibh

    Tha fios agaibh

    1,912
    601
    Aug 11, 2014
    I can't see enough detail to discern how it works, but it looks like it failed due to corrosion (water entry) near where the wires terminate.
    Try to get a number off of that 6 pin smd component on the left side of corrosion to figure out what it is.

    It looks like there's two separate contacts on the power button you could try jumping out one set of contacts at a time to see which one leads to power up ckt.
    Try to follow traces to see where power button leads to try and see how it works.
     
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