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Macbook Air M1 2020 A2337 - running on reserve battery (without battery)

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  • BMCappelletti
    Senior Member
    • Nov 2021
    • 196
    • Brasil
    #61
    Welll, made some progress.
    Replaced U5340 with one from a donor board. Now the short on PPCHGR_VDDA is gone.
    Still 5V on the meter, though.
    But also 5V on U5340 pin 5 and 1V on the F5200.
    Back to previous step. 5V and no current drawn, at all. Will replace the ISL again. Have one extra.
    Last edited by BMCappelletti; 01-12-2026, 09:44 PM.

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      • PITERPENY
        Badcaps Veteran
        • Jul 2023
        • 491
        • Ukraine
        #62
        Originally posted by BMCappelletti
        Welll, made some progress.
        Replaced U5340 with one from a donor board. Now the short on PPCHGR_VDDA is gone.
        Still 5V on the meter, though.
        But also 5V on U5340 pin 5 and 1V on the F5200.
        Back to previous step. 5V and no current drawn, at all. Will replace the ISL again. Have one extra.
        Sorry for interrupting, but have you tried it with a new battery? It looks like the original problem was a deeply discharged battery or a blown fuse, and if you don't have a battery repair tool, the only option is to replace it!

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          • BMCappelletti
            Senior Member
            • Nov 2021
            • 196
            • Brasil
            #63
            Originally posted by PITERPENY
            Sorry for interrupting, but have you tried it with a new battery? It looks like the original problem was a deeply discharged battery or a blown fuse, and if you don't have a battery repair tool, the only option is to replace it!
            I don't think this board requires a connected battery to negotiate 20V. At least I don't remember connecting one to it when I first solve the original issue. And I have repaired two or three M1s before and also think I never had to connect it.

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              • BMCappelletti
                Senior Member
                • Nov 2021
                • 196
                • Brasil
                #64
                Well, it took me some time to try again, cause I got a new job and didn´t have much time for it.
                I replaced U5200 and on the very first try got 20V on the meter. Set it aside as it was dinner time.
                Came bak, connected the meter and power again... back to 5V. Q5230 is glowing hot. I lifted L5230 and the short comes from CHGR_PHASE1. So still issues with the ISL chip? Why did it show 20V and the next try went to 5V again?

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