iMac 英特尔 21.5 英寸 Retina 4K 显示器（2017 年）电源更换。

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Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges.
Do not let any of the exposed solder joints come in contact with a metal surface, as that can cause a short.
Flip the power supply over to access the DC power cable connection behind the logic board.
To disconnect the cable, squeeze the release clip on the back side of the connector, behind the logic board, and pull the connector straight out.

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