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If your LG Optimus T will not turn on, or the battery will not charge replacing the motherboard may solve these issues.
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Using a prying device, such as a plastic opening tool, remove the phone’s back cover. At the top of the phone, there’s an indentation to put the Spudger into to pop the case off
 
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Remove the battery. There’s an indentation to the left of the camera lens to pull up on the battery with your finger
 
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Use a J0 screwdriver to remove the six 4.5mm screws.
 
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Remove interior case. Insert the spudger into the indentations at the top, or bottom of the phone to pry off the interior case.
 
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Remove SD card mount. Insert the plastic opening tool on the right side to pop off
 
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Remove metal panel
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There are four retaining points to insert plastic opening tool and pop off panel
 
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Use a J0 screwdriver to remove the two 1.8mm screws from charging port. (Charging port and motherboard are connected.)
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Remove motherboard
 
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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