bridges_4u
Senior Member
Last Activity: Yesterday, 07:45 PM
Joined: 02-10-2014
Location: kerala
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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; Yesterday, 11:58 AM. -
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; Yesterday, 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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Hi mon2,
Good to speak with you after a long while. Without F3050 removed, I have 8.65 at PPBUS_G3H. I think this comes with a 29W charger and the charger cable is not original, but of good quality though..!...Leave a comment:
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A1534 820-00244 Macbook 0v at L9000
I have got an 820-00244 logic board which consumes 14.71v and 0.311A when connected to an USB-C ampmeter. I have 0v at L9000, but at diode mode i get 0.298v. I also do not get voltages at L7430 & L7410. But I get 0.870v at L7230 & L7210. The logic was sent to another service center before reaching me. Is the CD3215 causing the voltage to stay at 14.71V???? All other voltages are present. Any clues.
Schematics Attached.Last edited by bridges_4u; Yesterday, 05:12 AM.
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