MAC A1706 NO POWER

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  • NConstantinou
    Badcaps Veteran
    • May 2017
    • 329
    • Cyprus
    #1

    MAC A1706 NO POWER

    GOOD MORNING ALL
    I HAVE THE ABOVE BOARD AND DRAWS 20V 0.087AMPS.
    PPBUS_G3H I GET 13.05V.
    I NOTICED L7960 IN DIODE MODE I GET 0.0001 ON PIN 2 WHICH GOES TO CPU. ALSO U7800 IS GETTING HOT.
    FOCUSING ON L7960 PIN 2 GOES TO C7964 WHICH SEEMS OK AND THEN DIRECTLY TO CPU.
    IS THE PROBLEM ON CPU OR U7800!

    THANKS
    Tags: None
    • Harryrepair
      Senior Member
      • Jul 2016
      • 80
      • Germany
      #2
      Gia sou, 0.00 seems low for the cpu. Check in resistance mode (OHM MODE)

        Comment

        • NConstantinou
          Badcaps Veteran
          • May 2017
          • 329
          • Cyprus
          #3
          Gia sou Harry, the resistance is very low 0.4 OHMS

            Comment

            • Harryrepair
              Senior Member
              • Jul 2016
              • 80
              • Germany
              #4
              indeed the resistance seems low. Try to inject into cpu and check the heat development

                Comment

                • NConstantinou
                  Badcaps Veteran
                  • May 2017
                  • 329
                  • Cyprus
                  #5
                  i have injected 0.7v and 1.2 amp on coil 7960 but nothing gets hot. if i increase amps the the red light from power supply goes off.
                  any other suggestions.

                  thanks

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 14003
                      • Canada
                      #6
                      Is the heatsink on the CPU off?

                        Comment

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