Introduction
Use this guide for replacing the motherboard on a Samsung Galaxy Tab 8.9. The guide shows how to disassemble the device to replace the motherboard.
Tools
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            Insert a plastic opening tool between the back cover and the screen of the Samsung Galaxy Tab 8.9. 
 
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            6 cm [2 in] away from the first plastic opening tool, insert a second plastic opening tool between the back cover and the screen. 
 
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            Slide the second plastic opening tool along the edge of the device to separate the back cover from the screen. 
 
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            Insert a spudger under the orange tab. 
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            Gently pry up the tab to disconnect the black flexible ribbon cable from the motherboard. 
 
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            Insert the spudger under the red, black, and white cables. 
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            Pry up and detach the battery from the motherboard. 
 
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            Locate the motherboard and 5 connectors on it. 
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            Pry up and detach the connector from the motherboard using the flat edge of the spudger. 
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            Repeat for the 4 remaining connectors. 
 
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            Using the Phillips #00 screwdriver, unscrew the 3 screws (1mm) that are located near: 
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            Camera 
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            Power and volume buttons 
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            Tilt sensor 
 
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To reassemble your device, follow these instructions in reverse order.