TechSplendid
Member
Last Activity: 04-10-2025, 11:50 PM
Joined: 10-06-2023
Location: Netherlands
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Yes, I noticed that too. However, the 3.4V is only present on the CD3217 that's connected to the port where I have the charger plugged in. On the other CD3217s, I do measure 3.3V. So I don't think that's the issue, unless all the CD chips are faulty. What I'm more wondering about is why I don't have USBC0_3V3LDO_EN on that one CD3217. Could this mean the replacement CD3217 isn't working properly after all, or could it be something else? -
I've done some more measurements. I hope I've presented them clearly this way. It's a bit of a maze for me since I'm not fully familiar with the workings of the CD3217 yet, but maybe someone with these details can shed some light on what might be going on. What stands out to me is that the CD3217 (UF400) doesn't provide USBC0_3V3LDO_EN and [FONT=Aptos][FONT=Helvetica]UPC01_5V_EN[/FONT][/FONT], regardless of which port I connect the charger to.
[B]Charger on JF600 Measured on UF400[/B]
PPVBUS_USBC0 = 5.2v
PP3V3_S2 = 0.02v
PP1V2_S2 = 0v
PP3V3_UPC0_LDO = 3.456v...Leave a comment:
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Swapped the ROM chip, but no change unfortunately. Anyone have any ideas?Leave a comment:
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Yep, found it already. Thanks! Gonna try it out tomorrow.Leave a comment:
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Thanks for thinking along, everyone. The connector (JF600) is fine, and all diode readings match the data in FlexBoardView. PPVBUS_USBC0 also measures correctly. DF622 and DZF620 also showed good diode readings.
I just measured PP3V3_UPC0_LDO, PP3V3_UPC1_LDO, PP3V3_UPC2_LDO, and PP3V3_UPC3_LDO again. What stands out is this: when I plug the charger into JF600, I only get 3.4V on the suspected CD3217, and 0V on the other CD3217s.
However, when I connect the charger to a different port, all CD3217s read 3.3V, with 3.4V on the CD3217 that belongs to that port.
So as...Leave a comment:
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I'm not at home right now, but I'll measure that again later. What I did notice was: when I connect the charger to the JF600, I measure 0V on PPDCIN_AON. However, when I connect the same charger to a different port, I get 5V on PPDCIN_AON. That's why I still suspect the issue lies with the CD3217Leave a comment:
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MacBook A2442 not powering on – suspecting CD3217, but replacement didn’t help
Hi All,
I'm working on a MacBook Pro A2442 (14", 2021) that's not powering on. On two out of three USB-C ports, I get 5V and the current briefly ramps up to around 0.210A before dropping to 0.036A. On the third port (JF600), I only get 0.0045A and it stays there.
Initially, I suspected a faulty CD3217 on that port, especially since I noticed signs of previous liquid damage near the JF600 USB connector. I replaced the CD3217 with an UF400 (from an A2442 donor board from the same location). According to the supplier, this should be a compatible version, but the behavior... -
Thank you! Is there also a BRD file?...Leave a comment:
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Did you ever find out what the problem was? I seem to have the exact same thing.Leave a comment:
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Again, thank you!
But when I read above I read that this is not working due to a bridgeos update. That makes it a bit confusing for me.Leave a comment:
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Hi anhbanxoi,
Thank you!!! And what I understood is that you do have to use an existing serial right? Does that have to be a serial from the same model or can it be a serial from another (older) model for example? What I am afraid of is that if you use a serial of an existing model and it is later linked to an icloud that the other also gets an icloud. Or is that not the case?
Thanks again!Leave a comment:
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Hi All,
Hope everyone is doing well. Do I understand correctly that an MDM unlock for T2 machines is no longer possible because of a BridgeOS update?
I was just about to learn this but if it is no longer possible then there is no point :-)
Thanks in advance!Leave a comment:
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Re: New Members - please post your introductions here
Hello, hope all is well with everyone. From my hobby, I recently started repairing macbooks and someone recommended me to sign up here on this forum. Hope to find useful information here and hopefully add value myself in the future.
Regards,
MatheoLeave a comment:
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Re: 820-01958 MBA 13" '20 A2179 Schematics/bv request
Thanks all!!!Leave a comment:
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