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Warm up the device to soften the adhesive.
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To separate the battery cover use plastic tools and a little isopropyl alcohol.
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Disconnect the battery and the main flex cable.
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Check the parts around the battery connector most probably damaged during previous repair.
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Re-solder the resistors or solder new if someone missing or broken.
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Abschluss
To reassemble your device, follow these instructions in reverse order.