Introduction
If your humidifier seems to not be turning on, follow this guide to access the power supply board. This guide is an easy-to-follow process of how to remove your power supply board for a replacement. For this guide, you will use a Phillips #1 screwdriver head to remove and replace your power supply board.
Tools
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            Lift up the water tank and separate it from the humidifier. 
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            Flip the humidifier over to its underside. 
 
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            Use the Phillips #1 screwdriver to remove the two 7 mm screws that secure the AC power plug. 
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            Remove the AC power plug cover. 
 
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            Disconnect the two cables with the red and white ends by pushing down the center tab at the end and pulling them out of their sockets. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.