Introduction
The official guide has been updated and can be found here. This guide is archived for historical purposes.
If you are having an issue with the motherboard (or any of its ports: HDMI, USB, etc.) and need to replace it, this is the guide for you. Be aware that any replacement or teardown beyond the hard drive voids the Sony warranty
Removing the motherboard separates the original thermal paste between the processor and the heat sink. Before you reassemble your device, reapply a new layer of thermal paste. Follow this guide to learn how.
What you need
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Disconnect the ribbon wire from the optical drive by pressing down on the metal release tab and gently pulling the ribbon wire. This should not require force.
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Disconnect the same ribbon wire from the motherboard; making sure you're pressing down on the metal release tab and gently pulling the ribbon wire.
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To reassemble your device, follow these instructions in reverse order.