Asrock a320m-hdv motherboard not turning on

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  • netgearnetgear
    Member
    • Mar 2022
    • 30
    • Trinidad
    #1

    Asrock a320m-hdv motherboard not turning on

    Good day members,
    I have a asrock a320m-hdv motherboard that does not turn on. This weird thing is that it turns ON when I heat the motherboard in the vicinity of the m2 slot with a blow dryer. The there is a capacitor and resistor in parallel that has a voltage of 1.79v and 819mV on either ends. When I heat the board and it turns ON, the voltage is 1.79v and 803 mV. It turns OFF and ON normally if I wait a few minutes. On the other hand if I wait for an hour or more it does not turn ON anymore. I have to heat that area again and then it works. I noticed slight heat for example from my finger causes the smaller voltage to decrease slightly. I believe the 12 pF capacitor is faulty. Any advice in how to solve this problem would be greatly appreciated.
    Thanks and regards.
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    • Gcs_rma
      Banned
      • Dec 2023
      • 108
      • N/A
      #2
      TRY Click image for larger version Name: 13.png Views: 488 Size: 43.8 KB ID: 3173166 Click image for larger version Name: 14.png Views: 475 Size: 42.3 KB ID: 3173167

        Comment

        • netgearnetgear
          Member
          • Mar 2022
          • 30
          • Trinidad
          #3
          Hello, I measured the voltage and it is 1.796 volts.

            Comment

            • netgearnetgear
              Member
              • Mar 2022
              • 30
              • Trinidad
              #4
              After heating the components in this area one by one, I was able to single out a resistor that when heated the board turns ON when I press the power button. I will measure it when the board is working and also when it is not. Will possibly look to replace it and let you know.

                Comment

                • DynaxSC
                  Badcaps Veteran
                  • Apr 2021
                  • 458
                  • Poland
                  #5
                  You might have just a cold solder point, apply some flux and reflow the area with a hotair gun, if you dont have one you could try to resolder the resistor with a solder iron with a very small tip, and very short, as otherwise you will desolder the whole resistor.

                    Comment

                    • netgearnetgear
                      Member
                      • Mar 2022
                      • 30
                      • Trinidad
                      #6
                      Thx for your advice...

                      Update:

                      Voltages on capacitors:
                      pc239 : pin1 - 5.116V, pin2 - GND
                      243 : pin1 - 5.116V, pin2 - GND
                      244 : pin1 - 5.116V, pin2 - GND
                      246 : pin1 - 1.908V, pin2 - 6.527V
                      242 : pin1 - 1.879V, pin2 - GND
                      248 : pin1 - 5.117V, pin2 - GND
                      245 : pin1 - 4.810V, pin2 - GND
                      247 : pin1 - 1.879V, pin2 - 802mV

                      Voltages on Chip (MP1475DJ-LF-Z)
                      Pin1 : 4.762V
                      Pin2 : 5.115V
                      Pin3 : 0V
                      Pin4 : 0V
                      Pin5 : 6.527V
                      Pin6 : 3.032V
                      Pin7 : 4.810V
                      Pin8 : 811.7mV​

                      Pin 3 should not be 0V. Will reflow this chip ans see if it works, otherwise I may need to replace it.

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