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MBA A1466 820-00165 no green light, no boot

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  • #16
    My Q7010 looks different from the boardview graphics, which shows 4 Pins called 1,4,5,6 in a different arrangement then what is on the board. On the board I have an 8 point component. Looking at the board with the fan/DCin board on the right: Q7010 with its 8 pins ( 4 each side) has 15.1V on the top left, and 14.1 on the top right. Am I right to assume that the left pin 15.1V then is my Source voltage, also present at P1 of R7012 and that the right pin 14.1V must be my gate? C7012 P2 also has 14.1V, so my gate voltage is lower as it is supposed to be, right? But it still does not open Q7010....since there is nothing at R7005. Maybe Q7010 is kaputt?

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    • #17
      I am checking R7010 and R7011, both have correct ohms...Do not know how to test Cap C7012

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      • #18
        Identify Q7010 pins from schematic; boardview doesn't correspond.
        Pin1 is marked on the chip package.

        Gate of Q7010 should have 6.8V; change D7012.
        Be aware, is not an easy job.
        One time I didn't have original in stock and I used one in SOD27 (DO-35) package.
        I conveniently cutted off the pins and soldered to other component terminals.

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        • #19
          OK, I will order some of the diodes you pointed out SOD27 (DO-35) from Mouser. If you have any suggestion what other components are used frequently in Macbook repair 2009-now, I could order them all at once...Must read up on what the diode designations mean...I am without the faintest clue...Would this one work?:https://www.ebay.ca/itm/10PCS-1N4148...9MIA:rk:3:pf:0
          Last edited by jurgenkoppen; 02-24-2019, 12:31 AM.

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          • #20
            I used that "monster"package because didn't have original that time, nor even from scrap.
            Buy GDZT2R6.8 and be very carefull when change it.
            If you had problems to change a 0201 resistor, I cannot imagine what will happen with that very tiny diode.
            This is the reason I mentioned the option for a diode with legs.

            Don't forget to apply leaded solder on the diode pads before place it on the board.

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            • #21
              Thank you for all your help, it is so much appreciated. And yes, the tinyness of the components are a real challenge for me, but I am determined to learn how to do it, if it is the last thing I do. Largely my shakiness is from excitement, it is all so new and mysterious...but I am learning quickly. I did not realize for instance that you would prep the tiny components with a bit of leaded solder until you just now mentioned it. Makes perfect sense!! I have a few of 2009/2010 Mbps I got on Ebay to be my learning aids, ( I was hoping to restore them by replacing the Tantallon cap) Working with this forum is the most exciting way to go about learning..However the components on the Mbas, which my friends give me to fix, are even smaller...One question on diodes: I suppose I can find some on my donor boards, but I am not sure what designation is important...

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              • #22
                I looked on some of my donor boards for a diode, and found plenty with the 6.8V designation on the A1268 board. However, the symbol is different. The one on the 00165 board has one triangle pointing away from ground towards the horizontal bar. All donor board diodes I have seen have 2 triangles pointing towards each other. Is this just a slightly different symbol still meaning the same? Can I still use those on the donor boards? I also ordered some monsters, as you put it , but perfect for my currently still limited skill level: https://www.ebay.ca/itm/291528748673. In case the donor board double triangle diodes are not useful...

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                • #23
                  Original is 6.8V zener diode; pretty sure will work any from 5V6 to 8V2 range.
                  Using fake charger, machine will work even shorting D7012 to ground.

                  Te zener voltage is marked on the schematics; doesn't matter package symbol.

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                  • #24
                    I finally have some time and I am setting out this morning to transplant the 6.8V diode from my A1286 donor to the MBA. Just wondering if you would help me clear up a bit of foggy understanding as far as orientation goes? I suppose I can determine the orientation of the diode I will harvest by measuring resistance and that way determine which way the one way valve for current is oriented, right? And then install it accordingly with the non conducting side to ground. Is that right? Here is where the diode will be coming from...Screen shot 2019-03-08 at 11.13.40 AM.png

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                    • #25
                      You talk about bidirectional TVS diode.
                      I'm not sure if it works as you need, for very small current; but you can try.
                      No matters how you solder it, is bidirectional.

                      TVS diode are used to protect against overvoltage, sinking high currents...

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                      • #26
                        I tried and tried,but could not get any of them to stick. I think I will have to wait for the monster zener diode with legs aka pins to arrive from China. I really suck at tiny soldering still. Must watch more videos on it, I suppose....

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                        • #27
                          First time I soldered D7012, I lost two; is a nightmare.
                          You must put leaded solder on its pads first.

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                          • #28
                            Yes, I was quite frustrated and had to call repeatedly on my infinite patience.Thank you for letting me know that I am not alone in finding this super tricky. The tiny bits either flick away or get stuck to the iron. I will educate myself , there must be some youtube channel that discusses how to go about this. I shall never surrender....if anyone else can do it, then so can I. Cheers, you are an awesome teacher

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                            • #29
                              You can't solder it with iron tip.
                              Use it only to place it on the flux, in it's place.
                              Then use hot air to solder it.
                              Microscope should help you a lot.
                              Put more flux there, so hot air do not move it away...

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                              • #30
                                It turns out that the 6.8V multidirectional diodes are not a replacement for the 6.8V Zener diode. Well, if nothing else it was good exercise in removing diodes from the donor boards. I added leaded solder as I removed them from the donor board, at least they cannot get away that easy, and I have them primed with leaded solder ready to reinstall. After a lot of tries I did get it into place. Would have been so cool if that would have done the trick, since there are lots of them on the old board in the audio circuits, but alas, no cigar. So I am back to zener diode shopping...Being in Canada makes buying stuff from Louis' website pretty expensive, shipping is over the top, for reasons beyond my comprehension.

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