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Macbook A1286 2010 gpu UMA doubt

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    Macbook A1286 2010 gpu UMA doubt

    Hi

    I have some a1280 820 2915 boards no one gives image at all... but they turns on and chimes.
    It is very likely to be GPU issue so wanted to follow jumper gmux converting to uma way...

    My question would be: is this posible? since they dont give video ...no backlight...no gray or white screen no logo...
    I mean chime is heard ...fan spins .. mac is on but no image...

    Is uma conversion posible only when you have primitive video? Or can be the case when you do not have video at all?

    Thanks in advance.
    Last edited by marce002; 07-04-2021, 08:57 AM.
    Marcelo J

    #2
    Re: Macbook A1286 2010 gpu UMA doubt

    Yes.

    820-2915 = A1286 2011
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment


      #3
      Re: Macbook A1286 2010 gpu UMA doubt

      Piernov your YES answer means that i can try to do all the jumpers method *1 even when no video ? (No logo no white screen but chimes)

      *1 https://forums.macrumors.com/threads...ypass.2134019/
      Marcelo J

      Comment


        #4
        Re: Macbook A1286 2010 gpu UMA doubt

        ok fixed 2 1286 820 2915 with the method assuming your answer like yes, and worked fine, lot of jumers no bright but works! now i need to do a 820 3330 but seems to be different. thks
        Marcelo J

        Comment


          #5
          Re: Macbook A1286 2010 gpu UMA doubt

          820-3330 GMUX circuit is the same as 820-2915.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

          Comment


            #6
            Re: Macbook A1286 2010 gpu UMA doubt

            Sorry to crash your topic, but i've also done the conversion, but i get garbled screen for a few seconds and then goes full white, like only backlight is on...what have i missed? i have like 2 or 3 schematics with drawn ways on how to connect the bypass, and they are simmilar, so i thought one is updated to cut the time or wire length, and i did something wrong obviously...

            And are the small resistors important around the gmux chip? Because i think 2 of them are accidentaly gone...but i thought since it's a bypass they don't matter.... they are rounded in the image attached....
            Attached Files

            Comment


              #7
              Re: Macbook A1286 2010 gpu UMA doubt

              Originally posted by piernov View Post
              820-3330 GMUX circuit is the same as 820-2915.
              i have 820-2850-a can this method work

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