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[SOLVED]820-2879 Green Light Dark

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  • [SOLVED]820-2879 Green Light Dark

    PP3V42_G3H 1,68V

    PPDCIN_G3H_OR_PBUS_R 16,35V



    replaced U6990 same problem

  • #2
    What is the resistance to ground on PP3V42_G3H? R6995/R6996 good?

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    • #3
      PP3V42_G3H 6,3 ohms

      R6995 127,3 ohms
      R6996 127,3 ohms

      if I remove resistance R6995 ou of circut 348K and R6996 200K out of circut

      same value with another donnor

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      • #4
        Remove L6995 and check which pin is shorted.....

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        • #5
          removed L6995 short to gnd pin 2 PP3V42_G3H :/

          what do I have to do ? inject voltage in PP3V42_G3H ?

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          • #6
            yeah.......

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            • #7
              ok 1V for beginning ...

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              • #8
                nothing heat

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                • #9
                  Resistance to GND on Y2810? If lower then 10Mega Ohm your MCP is fried.

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                  • #10
                    Pin 4 of Y2810 to GND 7,2 Mohms
                    Pin 1 7,20 ohms

                    Does that mean the MCP is dead ?

                    I have new chip but A2, in board it's A3

                    (on Mac mini 2010 succeful MCP89MZ-A2 to MCP89MZ-A3 but in the other direction probably work ?)
                    Last edited by aurel476; 05-12-2017, 04:21 AM.

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                    • #11
                      MCP is dead to start with. I doubt the chips are new, reballed garbage that are likely dead too. A2 and A3 versions are compatible.

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                      • #12
                        Solved after replaced MCP no short to gnd PP3V42, replaced bad fuse for backlight and ISL destroyed by customer (ppbus low). (display port not work fuck)

                        Thank you I would not find that this comes from MCP
                        Last edited by aurel476; 05-13-2017, 05:00 PM.

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