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    1) Take One Among The 4 Pin Peripheral Cable Connector and You Will Observe A Yellow, Red

    Uploaded by

    Suman Koirala
    The document discusses how to test a computer's power supply unit (PSU) to determine if it is faulty. It explains that connecting a 10 ohm resistor across the yellow and black wires from a peripheral cable connector, and shorting the green and black wires from the 24-pin main power cable, will allow you to see if the PSU fan spins up. If the fan spins, the PSU is likely functioning properly. If the fan does not spin, the PSU should be replaced before attempting to power the computer.

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    Download as DOCX, PDF, TXT or read online from Scribd

    1) Take One Among The 4 Pin Peripheral Cable Connector and You Will Observe A Yellow, Red

    Uploaded by

    Suman Koirala
    352 views4 pages
    The document discusses how to test a computer's power supply unit (PSU) to determine if it is faulty. It explains that connecting a 10 ohm resistor across the yellow and black wires from a peripheral cable connector, and shorting the green and black wires from the 24-pin main power cable, will allow you to see if the PSU fan spins up. If the fan spins, the PSU is likely functioning properly. If the fan does not spin, the PSU should be replaced before attempting to power the computer.

    Original Description:

    checking SMPS power supply of PC

    Original Title

    SMPS Checking

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    © Attribution Non-Commercial (BY-NC)

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    The document discusses how to test a computer's power supply unit (PSU) to determine if it is faulty. It explains that connecting a 10 ohm resistor across the yellow and black wires from a peripheral cable connector, and shorting the green and black wires from the 24-pin main power cable, will allow you to see if the PSU fan spins up. If the fan spins, the PSU is likely functioning properly. If the fan does not spin, the PSU should be replaced before attempting to power the computer.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    352 views4 pages

    1) Take One Among The 4 Pin Peripheral Cable Connector and You Will Observe A Yellow, Red

    Uploaded by

    Suman Koirala
    The document discusses how to test a computer's power supply unit (PSU) to determine if it is faulty. It explains that connecting a 10 ohm resistor across the yellow and black wires from a peripheral cable connector, and shorting the green and black wires from the 24-pin main power cable, will allow you to see if the PSU fan spins up. If the fan spins, the PSU is likely functioning properly. If the fan does not spin, the PSU should be replaced before attempting to power the computer.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 4

    The personal computers at your office or  

    home  are  powered by electronic power supply


    units called Switched Mode Power supply (SMPS). Commonly known as Power Supply
    Units (PSU) this hardware converts  the input AC power to output DC  varying  with respect
    to voltage. Though there are PSUs available in different form factors, ATX is the most
    commonly available and used one right now.

    Being the most vital part of  workstation its important that a PSU work continuously without
    any hiccups. Have you ever noticed a PC that restarts quite often or a PC that shuts down
    after a short duration without  you initiating it? Well chances are high that the SMPS/ PSU  is
    faulty. The test or confirmation about the status of SMPS is a must before speculating on
    what might be the possible reason for PC failure. Here is how exactly you can confirm that.

    Firstly,  make sure that  the power cord is detached from  PSU and then take out the unit from
    cabinet. You will notice a 24 pin main connector along with many other 4 pin peripheral
    cable connectors coming out from the PSU. Here is what you have to do next:

    1) Take one among the 4 pin peripheral cable connector and you will observe a yellow, red
    and two black wires from it. The yellow wire being the 12 volt supply and black the ground,
    you must connect a 10 ohm /10 watts ceramic load resister across them.
    This is how a ceramic resistor looks like:

    2) Connect the power cord to the PSU now and take the 24 pin main power cable connector
    to the motherboard. You will notice a green wire and few adjacent black wires. Power the
    SMPS/PSU now and short the green (pin 16) and black (pin 17) point using a jumper (wire) .
    If the PSU fan rotates you can 8o % confirm that the unit is functioning well. There are still
    chances that the PSU can be faulty which can be tested by checking the output volts at the
    pins. If the fan does not rotate then you must replace ( or repair ) the unit before trying to
    power your PC again.

    Pin description of the 24 pin power cable connector is given below:

    Pin Name Color Description


    1 3.3V Orange +3.3 VDC
    2 3.3V Orange +3.3 VDC
    3 COM Black Ground
    4 5V Red +5 VDC
    5 COM Black Ground
    6 5V Red +5 VDC
    7 COM Black Ground
    Power Ok is a status signal generated by the power supply to
    notify the computer that the DC operating voltages are within the
    8 PWR_OK Gray
    ranges required for proper computer operation (+5 VDC when
    power is Ok)
    9 5VSB Purple +5 VDC Standby Voltage (max 10mA)
    10 12V Yellow +12 VDC
    11 12V Yellow +12 VDC
    12 3.3V Orange +3.3 VDC
    13 3.3V Orange +3.3 VDC
    14 -12V Blue -12 VDC
    15 COM Black Ground
    16 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch
    power supply ON, disconnect from GND to switch OFF.
    17 COM Black Ground
    18 COM Black Ground
    19 COM Black Ground
    -5 VDC  (this is optional on newer ATX-2 supplies, it is for use
    20 -5V White with older AT class expansion cards and can be omitted on newer
    units)
    21 +5V Red +5 VDC
    22 +5V Red +5 VDC
    23 +5V Red +5 VDC
    24 COM Black Ground

    Data credit  : pinouts.ru

    Hope this post helps you to test  computer SMPS next time you come across such a situation.
    Share your thoughts and do share if you liked.

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