Einleitung
If your Zenbre SoundBank Z3 speaker isn't working properly and is not responding to your touch, then there is most likely an issue with the internal circuit board that connects the buttons to the motherboard. The motherboard is custom to the device, so you will need to get a replacement from a similar device in order to repair your speaker.
Werkzeuge
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Remove the four 4.5 mm silver Phillips screws that secure the plastic panel covering the motherboard.
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Remove the plastic panel.
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Remove the pressure-fitted foam from the slot by hand.
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Unravel and remove foam from the wires.
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Desolder the speaker joints from the motherboard. Follow this How To Solder guide for help with desoldering.
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Remove the speaker from the motherboard.
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Remove the speaker ring.
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Repeat Steps 5-7 with the other speaker.
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Remove the two 4.5 mm Phillips silver screws holding down the motherboard.
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Lift the motherboard out of its housing.
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Use an iFixit opening tool to lift up the ribbon connector.
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Slide the ribbon cable out of its connector.
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Remove the four 4.5 mm Phillips silver screws.
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Remove the six 7 mm Phillips black screws.
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Carefully remove the round black cover of the circuit board by using a spudger to pry it upward.
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Remove the four screws.
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Remove these four 7 mm black screws.
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This will free the circuit board, which can now be lifted away from the housing.
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To reassemble your device, follow these instructions in reverse order.