| Use this guide to replace the power supply. |
| Use this guide to replace the power supply in your 21.5" Retina 4k Display 2017 iMac. |
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| Opening this device requires cutting through adhesive that will need to be [https://www.ifixit.com/Guide/iMac+Intel+21.5-Inch+Retina+4K+Display+%282017%29+Adhesive+Strips+Replacement/96196|new_window=true|reapplied] after you finish the repair. Be sure to test your new parts before sealing the iMac with the adhesive strips. |
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| This guide is marked "potentially dangerous" because it requires you to handle a power supply that contains large capacitors. Unplug the iMac and hold the power button down for at least 10 seconds to help discharge the capacitors. Handle the board by the edges and do not touch surface components. |