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How To Fix Grounded Power Supply. First you want to turn the power switch at the rear of the power supply to the off position. Unplug the supply1 connect a load that runs the supply around half of its rated current change the fuse plug in the supply.
How To Properly Ground A Macbook Pro Ask Different from apple.stackexchange.com
Secure the positive DC power source cable to the RTN return. Also Ive tested the PSU on two outlets. Just put on a high gain tone and turn up the volume.
Record whatever you hear if they even ask for it.
Does the supply work. The Power Supply Need Grounding. Remember it is impossible to get shocked from a properly grounded appliance and a bad power supply is a lot cheaper to replace than a fried-out laptop. You get a ground loop if you have two different devices plugged into different grounded outlets that are connected to each other.