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+[* black] Unscrew 1 screw on FPC, unsolder 4 joints of relays.
+[* black] Unscrew 3 screws.
+[* black] Unscrew 1 screw on FPC, unsolder 4 joints of optocoupler. Be aware the ring and ring position points by arrows. It's easy to fall off, so I keep it as the last step, after completely remove FPC, install the new one immediately.
+[* black] There are some plastic pads stick on old FPC, remove and install them on the new FPC.

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