Introduction
If your Nest Cam IQ motherboard is overheating or shutting down, it requires replacement.
A functional motherboard connects all of your hardware. If you notice a burning smell coming from the motherboard or if the motherboard is off completely, consider changing out your motherboard.
Tools
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            To soften the adhesive holding the camera together, heat up the edges of the glass lens using a heated iOpener on the device. Alternatively, you can use a heat gun to loosen the adhesive. 
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            Leave the Opener on the glass lens for two minutes. 
 
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            Place a suction cup on the glass lens that you heated up with the iOpener. 
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            Press down on the suction cup to create a seal, and pull up with force to create a separation between the glass lens and the body. 
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            Pull off the glass lens using the suction cup. 
 
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            Carefully disconnect the flat black ribbon cable connecting the metal plate to the LED. 
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            Remove the metal plate. 
 
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            Carefully disconnect the flat black ribbon cable connecting the LED to the motherboard. 
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            Remove the LED cover. 
 
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            Carefully disconnect the flat black ribbon cable connecting the camera to the motherboard. 
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            Remove the camera. 
 
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            Remove the three 19 mm TR6 Torx screws from the camera holder. 
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            Carefully lift the tab up and away from the camera holder. 
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            Remove the camera holder. 
 
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            Remove the four 11 mm TR6 Torx screws from the clamp securing the mounting stand. 
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            Remove the clamp. 
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            Carefully pull away the cables connecting the mounting stand to the body. 
 
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            Carefully remove the mounting stand. 
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            Remove the three 9 mm TR6 Torx connecting the motherboard and speaker to the body. 
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            Pull the motherboard and speaker from the body. 
 
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            Remove the one 8 mm TR6 Torx screws securing the speaker to the motherboard. 
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            Remove the two 4 mm TR6 Torx screws securing the speaker to the motherboard. 
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            Carefully pull away the speaker. 
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            Carefully disconnect the cable connecting the speaker to the motherboard. 
 
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            Remove the four 4 mm TR6 Torx screws securing the motherboard. 
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            Remove the two 5 mm 3.5 low-head socket cap screws securing the motherboard. 
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            Remove the motherboard. 
 
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To reassemble your device, follow these instructions in reverse order.