Hello, I received an A1990, which is said to have simply switched off during operation and no longer started. Nothing is said to have been done to the logic board. But I have now seen that the Q3100 and Q3200 have been blown or swapped! The MacBook starts normally but does not load! So if the battery is empty it won't start anymore!
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Re: A1990 2019 will not load
Hi. SSD will not load ? Check the voltage of PP2V5_NAND_SSD0 to ground.Comment
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Re: A1990 2019 will not load
The Mac will not load.During the first test I had 5V and 1.8 amps but now nothing is displayed on the USB-C connector.
I think Q3200 and Q3100 are damageAttached FilesLast edited by Strolch; 12-03-2022, 02:10 PM.Comment
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Re: A1990 2019 will not load
I swapped Q3100 and Q3200. Then the 4.765V and 2.843A showed up and then it went out and nothing shows up anymore. only sometimes a slight light.Attached FilesLast edited by Strolch; 12-03-2022, 03:57 PM.Comment
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Re: A1990 2019 will not load
Check the fuses that are on the same rails.
It is possible that these dual mosfets are defective but check the fuses first @ F3000 & F3001.Comment
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Re: A1990 2019 will not load
Fuses are okComment
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Re: A1990 2019 will not load
And the MacBook A1990 works but the battery only has 25% and then it stays off ;-)Comment
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Re: A1990 2019 will not load
Whether the CD3215A has anything to do with it?Comment
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Re: A1990 2019 will not load
Check the voltage readings of the smbus lines on the battery connector. These are the SCL and SDA pins.Comment
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mb code:820-01827-A;
sn:C02Z349ALVDR;
i9 32GB Ram 1TB
Hi, I found short on one of 6 black nand (total 1TB).
i removed all 6 nand ( voltages all ok) and now i want to program with JC P15 but for A1990 2019 there is only 512GB configuration.
I try A2141 1TB configurazion with TSB4228 but the position on pcb is different ( U9300 and U9400 is no stuff on A1990 but present on A2141 and U8800 and U8900 is no stuff on A2141 but present on A1990 )
macbook with A2141 configuration run on recovery but don't complete it.
anyone can help me?05-26-2025, 09:27 AM -
Hi there,
This is my first post. I just wanted to come here to get a clear answer from some people about MDM removal on the 16 inch 2019 A2141 MBP & 15 inch 2018 MBP A1990. I have seen a lot of things on MDM removal, and wanted to know exactly what is needed to remove it, and what the best option is in 2024 when running Sonoma.
I know that Checkm8 have an MDM removal service now, that seems to be a permanent removal. I also have heard you can remove the T2 ROM and use a programmer to read the data and change the serial number. Im not 100 percent sure if this is a...06-23-2024, 09:41 AM -
Hello to all of you engineers
i have a macbook pro a1990 in no power condition
another shop had done some works on it with no success (pm ic was reflowed, a little bit of flux around one of the type c rom ic, changing the charging ic)
initial state: 5v 0amps on all 4 type c sockets
after some inspections i realized the charging ic that another shop installed is isl9239
I changed it with right one (isl9240) and the machine turned on and booted into macos
weird behaviour:
Lcd works ok until it boots to os and as soon as you see login page it goes black... -
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