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MacBook Pro 820-01598 - 5v 0a - complete novice

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    #1

    MacBook Pro 820-01598 - 5v 0a - complete novice

    MacBook Pro 820-01598 - taking only 5v 0a on the meter- I'm a complete novice and new to this wonderful forum. Ive been fixing Macs for 25 years but am finding that I need to ship my boards out for cap repair more often than not and as I now share my building with somebody with all the equipment to do board level repairs I want to try to fix some of those issues in house. I am finding so many time clients bringing in their mac's with zero power. I have been trying to understand some of the forum I have searched through and am a little out of my depth but want to learn if I can from you talented lot...

    I have been trying basically trial and error taking readings from various caps around the USB controller area (I think) , some are running at 5v and some have zero coming through. Most seem fine on ohm tests but again the values could be important from I have read over the last few days on other posts.

    I am slowly getting my head around openboardview and I think I can find locations of parts that way but again very new to this (sorry)

    I have found I can locate things quite easily when there is a photo of the board too.

    So, I have 2 of these 13" MBPros with the same 5v 0a input on the board with zero boot. Tried DFU mode, no beans...

    What would you folks suggest as the best step through guide to start to locate where the issue could be (I'm edging towards Usb controller end to be honest) but need to be guided by the pros...)

    Anything you could offer would be amazing as I'm sure with some time, energy and your input I can crack this...

    Cheers in advance for anything...
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    #2
    Re: MacBook Pro 820-01598 - 5v 0a - complete novice

    Not to discourage you, but probably not the best machine to start out on. The A1466 Macbook Air is hands down the best to learn from, and the power sequencing is pretty well documented on logi.wiki. For the most part, these boards are very easy to fix.

    T2 machines are a bit more complex and you need to understand how they differentiate from the older machines and how that affects the boot process. Just because you have no 20V doesn't mean you have an issue with the USB-C controllers. It's usually because PPBUS_G3H is shorted or an absent PP3V3_G3H.

    The air intakes were moved on the 2018 chassis directly adjacent to the board and you often get shorted caps in these areas due to corrosion etc. Check the repair wiki for this model for common stock faults. Check all your rails for shorts first.

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      #3
      Re: MacBook Pro 820-01598 - 5v 0a - complete novice

      "The air intakes were moved on the 2018 chassis directly adjacent to the board and you often get shorted caps in these areas due to corrosion etc. Check the repair wiki for this model for common stock faults. Check all your rails for shorts first." - will check these out as I am eager to learn. But falling at first hurdle...how do I find the repair wiki?

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        #4
        Re: MacBook Pro 820-01598 - 5v 0a - complete novice

        https://repair.wiki/w/A2159_2019_13%22_MacBook_Pro

        Check out a few of Louis Rossman's video's. You do not need to immerse the board in copious amounts of flux like Louis does, Paul's amounts are more suitable.

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