#PSUS PINOUT MAC MINI POWER SUPPLY HOW TO#

Similarly, to test +12V, connect the Red lead of the multimeter to the Yellow wire pin and Black lead to any black wire pin of the Molex connector.

If the +5V voltage rail is working properly then your multimeter will show voltage close to 5V. First, connect the Red lead of the multimeter to the Red wire pin of the Molex connector and Black wire to any ground wire of the Molex connector. Now, suppose you want to check the 4-pin Molex connector that outputs both +12V and +5V. Set your digital multimeter on DC mode.Ĥ. Start the PSU by shortening the “Power On” pin with the ground pin by following the jumper method mentioned above in this post.ģ. Unplug the PSU connectors and make sure the power supply is not connected to the mains.Ģ.

#PSUS PINOUT MAC MINI POWER SUPPLY HOW TO#

How to Test Voltage Rails & Connectors using Multimeterġ. In almost all power supplies, the black wire is the common or ground wire, yellow is for +12V and the red one is for +5V. To test the various connectors and voltage rails, you have to know the connector pinout diagram and wire color coding for different voltages to get the reading on the multimeter. If you don’t have a digital multimeter then you can purchase it online. If the voltage levels are significantly lower or higher than the reference then it may cause damage to the components connected to the PSU. It is also used to check the connectors of the PSU and whether they are outputting proper voltages. You can use a basic and inexpensive multimeter to check the PSU rails by measuring the voltages across various connectors of the power supply. So, to test the voltage rails and connectors, you have to use the below-mentioned methods. The jumper method can only tell you that the PSU is powering up but it does not tell you whether all the voltage rails are functioning properly and the connectors are outputting proper voltages. Below is such a power supply jumper adapter and it supports both 20-pin and 24-pin connectors.īy Power Supply Jumper Bridge Tool Testing Power Supply Rails & Connectors If you are not comfortable doing this jumper procedure manually then you can get a Power Supply Jumper Bridge Tool which can be plugged into the 24-pin/20-pin connector of the PSU to get the same result. However, in the case of passive PSUs without a fan, you have to attach a case fan to the 4-pin Molex connector of the PSU to check that the PSU has started. This still indicates that the PSU is functioning normally. Note: Some power supplies have a zero-RPM feature that results in the fan only spinning for a moment after the PSU is powered on. If the PSU fan starts spinning then it means the PSU has started and is powered On. Plug the PSU cable into the mains power socket, turn ON the mains power, and also the power supply if the PSU has an ON/OFF switch.Ħ. Insert a paper clip, solid copper wire, or small wire in the 4 th and the 5 th pin you have located.ĥ. Here the fourth pin is the ‘Power On’ the sensor pin and the fifth pin is the ground pin.Ĥ. Now count the fourth and fifth pin from the top-left of the connector. Hold the 24-pin or 20-pin connector in such a way that the connector clip is facing up and the pins toward you.ģ. Unplug the PSU from the computer and mains.Ģ. Steps for Testing PSU without Motherboardġ. In the images below, you can see the green-colored Pins in the 24-pin and 20-pin connectors are ‘Power Supply On’ sensor pins. For the 24-pin connector, it is PIN 16 and for the 20-pin connector, it is PIN 14. It is done by shortening the Power Supply ON (PS_ON) Signal Pin of the 24-pin or 20-pin ATX connector of the PSU with any one of the ground pins in the connector. It is a basic Power ON test to check whether the PSU is starting or not. Here are the various methods by which you can check or test the Power Supply Unit (PSU) of the PC.

Psus pinout mac mini power supply