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MBP A1286 820-2915 green light only, no start

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    #21
    Not yet, will do it and report back. Thanks

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      #22
      C9560 failure is a problem on 820-2850 not 820-2915.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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        #23
        be very carefull that the psu is in perfect working condition as some charger give green light but fail to power on the board. also bad battery can lead to this problem too.
        try smc bypass if it start:
        short the 2 pins on board, then connect psu while keeping the two pads shorted, then release the pin and short them again. check if pc start with full fan spin and give post and screen.

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          #24
          Originally posted by kevingill View Post
          Have you replaced C9560 BTW?
          I've checked its value - it has 300uF (the schematic says it should be 220uF). In any case, it seems to be ok. The voltage levels are unchanged without this capacitor.

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            #25
            Originally posted by dellxps15 View Post
            try smc bypass if it start:
            short the 2 pins on board, then connect psu while keeping the two pads shorted, then release the pin and short them again. check if pc start with full fan spin and give post and screen.
            I did that, the fans won't start, the voltage levels are unchanged, the pulsing rails still pulsing.

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              #26
              Any other idea?

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                #27

                read voltage on C7205 pin N° 1
                check voltage of r7940 both side,
                post u7201 voltage.
                Last edited by dellxps15; 10-18-2024, 02:07 AM.

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                  #28
                  Sorry for the delay ... long working hours ...

                  So, ping 1 on C7205 - oscillating
                  Same for both sides of R7940.

                  Regarding U7201, do you mean the voltage on all pins?

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