Introduction
Disassembly of the NES. Use this guide to learn how to open the system and replace items such as the 72-pin connector, controller ports/buttons, & plastics.
Tools
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            Remove six 13.25mm Phillips screws on the bottom of the system. 
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            Once all screws are removed, simply lift the bottom half away from the top housing. 
 
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            Remove seven 13.25mm Phillips screws around the perimeter of the RF shield. 
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            Lift the RF shield up and away from the system and place aside. 
 
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            Remove four 13.25mm Phillips screws from the four corners of the cartridge tray. 
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            Remove two 17.25mm Phillips screws from the top of cartridge tray. 
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            Once free, slide the cartridge tray towards you and then lift slightly in the front to remove. 
 
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            Remove three 13.25mm Phillips screws to free the motherboard from the bottom housing. 
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            Carefully lift the motherboard and turn it over to find the wired connections. 
 
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            Disconnect the wired connections from the motherboard. 
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            Player 1 (Shorter wires) 
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            Player 2 (Longer wires) 
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            Power/Reset Buttons 
 
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            The bottom RF shield is held on by tension around the expansion port. Lift the shield up and away from the motherboard. 
 
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            To remove the 72-Pin connector, apply force to each edge and slide the connector off the contacts on the motherboard. 
 
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            Remove two 13.25mm Phillips screws from the button assembly. Lift slightly in the back and then up and away from the housing to remove. 
 
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            Remove two 7.25mm Phillips screws from the bottom of the system. Lift the controller port faceplate up and away. 
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            Remove the controller ports by feeding them through the port holes to the front of the housing. 
 
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            Remove seven 7.25mm small flathead screws from the inside of the top housing. 
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            Two of these screws also hold a spring for the door. When reassembling, refer to the keyed shape of the plastic to orient these correctly. 
 
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            Screw List 
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            (19x) 13.25mm Phillips 
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            (2x) 17.25mm Phillips 
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            (2x) 7.25mm Phillips (Silver, large cap) 
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            (7x) 7.25mm Flathead (Silver, small) 
 
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To reassemble your device, follow these instructions in reverse order.