This section contains a brief explanation that helps the technician to identify and
troubleshoot the phone problems.
Make sure that your phone is turned off.
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Remove the back cover.
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Lift out the battery from the notch as per the following image:

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Inspect the phone main-board.
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Look for signs of corrosion or moisture and, if found, replace the main-board.
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Insert the battery.
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Put the back cover on.