bridges_4u
Senior Member
Last Activity: 01-07-2026, 11:49 PM
Joined: 02-10-2014
Location: kerala
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mon2 PPBUS_G3H is 8.65V. and is stable. Resistance to GND is 160.1Ohms at L7430 & 1.910Kohms at L7230. I have removed u7100.... -
mon2 PPBUS_G3H is 8.65V. and is stable. Resistance to GND is 160.1Ohms at L7430 & 1.910Kohms at L7230....Last edited by bridges_4u; 09-20-2025, 01:02 PM.Leave a comment:
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But i still have 0v @ L7430 & L7410. But I have 0.78V at L7230 & L7210. Does it only come on with the display connected?Leave a comment:
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Hi mon2. U9000 came in today. Now L9000 has 2.97V. Now I have 0.038V (diode mode) at L7430, L7410, L7230 which is higher than before....Leave a comment:
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mon2 Resistance of PP3v42 to GND is 91.7 kOhms. A small correction PP3v42 is 3.37V. Pin 1 of D7005 is 8.48V. Pin 2 of D7005 is 0V....Last edited by bridges_4u; 09-17-2025, 12:39 PM.Leave a comment:
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Schematics...
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820-3435-B Macbook Air 1465. Pulsing voltages
I have an 820-3435-B bought in by a customer that is not turning on. I have PP3v42 @ 3.292V, PPBUS_G3H @ 8.48V and PP3V3_S5 @ 3.298V. I do have amber light on the charger. All the other voltages are pulsing including PM_SLP_S4 as well. Any have any pointers where to start looking because, it can be caused by a horde of issues. Schematics attached. -
Yeah, Sure mon2. It looks like U9000 is partially driven by U9300 which is in turn driven by SMC and CD3215. But as we get the enable signal, I also presume that U9000 is the culprit. R9021 & R9072 are 1.87k each. Let me order u9000....Last edited by bridges_4u; 09-13-2025, 11:58 AM.Leave a comment:
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resistance from PPBUS_G3H to L9000 : 4.30 M Ohms. PP2V7_NAND_PVCC = 0v.Leave a comment:
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L9000 : Resistance to GND : 8.92kOhms
Yes. I do get PP5v5_S5 & PICCOLO_VEN1.
Regards...Leave a comment:
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Thank you for the reply mon2. These all make sense. Those voltages are already present. But the voltage to the NAND (2.98V)L9000 is absent, which comes from u9000 and the PCH. According to some posts at rossmanngroup, the SSD does not get detected. There is no short to ground on L9000, which leads me to assume that CPU may be the culprit. Cold or dry solder joints may be in play. Or else the CPU itself may be kaput? Plus there is not enough space to get the multimeter probes as well. Am i right?...Last edited by bridges_4u; 09-13-2025, 08:54 AM.Leave a comment:
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When i did some research on the internet, some sources say that 30W charger is the one for A1534. But a few others suggest using a 61W charger. Is the 30W charger the right one for this model?Leave a comment:
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Good info mon2. I might need to order an adapter in for this. Do u think I should try reflowing the CPU on this before that. the 2.98v to the nand may be missing due to a contact problem under the CPU? If yes, what is the suggested temperature level for reflowing these kind of thin layered boards?...Leave a comment:
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I would like to have that chart. I am indeed interested to go down the rabbit hole....Leave a comment:
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What about the USB-C ammeter reading? Should it be 20v or 14.71v? I was under the assumption that it should be 20V? Is there anything that could pull the voltage down from 20v to 14.71v? but in some posts at rossmanngroup, i saw that 14.71 is good.
https://boards.rossmanngroup.com/thr...ring-on.54444/
https://boards.rossmanngroup.com/thr...-no-ssd.58483/...Leave a comment:
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Unfortunately, I dont have another charger or same board.Leave a comment:
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mon2. I also had the same thought. but wanted to double check. The CPU on these boards go kaput due to no fan. Any further pointers?...Leave a comment:
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I will post the Vbus voltage after removing F3050 shortly.Leave a comment:
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