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Asrock a320m-hdv motherboard not turning on

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    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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    #2
    TRY Click image for larger version

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      #3
      Hello, I measured the voltage and it is 1.796 volts.

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        #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.

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          #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.

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            #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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