Hi mon2! The voltage on the usb C meter is 20v and 0.01a, then climes to 0.11a for a sec, then loops back to 0.01a. The reading is the same for both usb C ports on both sides. I am using the 61W USB-C Power Adapter and cable that came with the MacBook, but I have also tried another 96w Apple Charger as well with the same results. Also, might be worth nothing that it's the exact same readings even if the battery is connected or not.
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Check the resistance to ground of each inductor onboard. Searching for any improper loads on the rail. A low resistance reading is a suspect.
Check resistance to ground on PP2v5_NAND_SSD_0.Comment
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Thanks mon2 I will have to check it and get back to you!Comment
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Resistance to ground on PP2v5_NAND_SSD_0 is .427Comment
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That is a diode mode voltage reading which looks ok.
Meter in lowest resistance scale. Then measure the resistance to ground of this same voltage rail in ohms.Comment
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31.32 ohms.Comment
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That's with red on ground and black on component. Other way around it starts at 11.1 and starts to drop.Comment
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Does that number look correct?Comment
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Anyone?Comment
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Source a good known battery like mon2 stated. Whoever said you don’t need a battery to DFU is some what correct and incorrect. But most likely you will need a good known battery to DFU correctly. Try that first then proceed furthersigpic
MEOWING IN THE IMPOSSIBLE UNIVERSE!Comment
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Thanks Stephen, but you may have missed that I have already tried a brand new known working battery. That was not the issue. I was trying to find out what the resistance to ground on PP2v5_NAND_SSD_0 should be.Comment
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I guess no one has any idea's what I might try next?Comment
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Hi mon2! Thanks for your reply. The readings for I2C_PWR_SDA_R2 and I2C_PWR_SCL_R2 are looping from 0v - 1.8v over and over again. The other areas you mentioned have zero voltage.
I2C_THMSNS_SCL_R0 = 0v
I2C_THMSNS_SDA_R0 = 0v
I2C_SENSE_SCL = 0v
I2C_SENSE_SDA = 0vComment
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For each of these i2c lines that are at 0 volts, check them in diode mode.
Remove all power, meter in diode mode. Red meter probe to ground. Black meter probe to point to test.
Post each diode mode measurement.Comment
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Thanks mon2! I will do this for sure and post the readings once I have them. I'm off for a week so can't get at it right now! Cheers!Comment
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Hi mon2! The readings are ...
I2C_THMSNS_SCL_R0 = 0.489
I2C_THMSNS_SDA_R0 = 0.488
I2C_SENSE_SCL = 0.519
I2C_SENSE_SDA = 0.519Comment
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These are good diode mode readings. With the posted values, these lines are not shorted.
What are the voltage readings to ground for the following points?
SMBUS_3V3_BATT_SCL ; expecting each to be @ 3v3 but confirm
SMBUS_3V3_BATT_SDA
See attached. Check the voltage to ground of PP1V8_G3S. What is the measurement?
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The readings are ...
SMBUS_3V3_BATT_SCL ; Cycling back and forth between 3v3 and 2.75
SMBUS_3V3_BATT_SDA ; Cycling back and forth between 3v3 and 2.75
Zero voltage to ground on PP1V8_G3SComment
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Does that give you any idea what it could be?Comment
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Recently is seems all the A2289 boards that I am trying to revive or restore using Apple Configurator 2 gives me error -1
Have anyone experienced this and how to resolve it?... -
Hi,
I hope this is the correct place to post about this device. I originally posted regarding this on iFixit so see the details from that post below:
"I'm hoping someone can give their opinion on the symptoms I'm seeing before I spend any more time and put money into this. I got this MacBook from a customer and after looking at it they decided they didn't want it.
It doesn't turn on and there's no visual signs of life. I have tried resetting the NVRAM, SMC, power cycling, unplugging the battery, using the charger with the battery unplugged. Removed the... -
Hi everyone.
Recently got MacBook Pro A2289 with interesting behavior. Pristine condition, no water damage, no visual issues whatsoever. It has no image, no Caps Lock, no life except the fan is spinning. But it is able to connect to DFU mode and recognized by another MacBook. I tried to revive but the process ends when the MacBook usually should show an Apple logo with a progress bar and giving me error AMRestoreErrorDomain error 9. I don't have CPU Vcore.
Now I can't able to connect to DFU mode either.
On the USB meter I got 20V/0.9A power draw, and keep looping.... -
Hello to all ! I follow you but this is first time write !!
your forum is the best !!
so I’ve a2289 with water damage ! In first time other friend have clean and work ! But after some time stop working !
now, I open the MacBook and I see a lot of corrosion near backlight circuit (I attach some photos about that ) I think the problem is on backlight maybe bcs do strange boot then reboot (attach video ) I change some thing on the circuit like :
q8400
q8401
D8410
and the resistor R8431
if I check PPVIN SOSW LCDBKLT_R I’ve 12,9v
on...04-03-2025, 06:45 PM -
hi guys I have a 2020 MacBook Pro A2289 it has the i5 CPU and is now acting as if its dead,
when I plug in the charger cable with a volt meter thing connected as well its drawing 20.3v and 1.11A
if I press the power button nothing happens.
but if I hold the power button for 7 seconds or more the voltmeter drops all the amps down to 0.00A but voltage stays the same.
any ideas where I can check ??
from what I can gather it must be charging the battery at 1.11A as nothing happens when the power button is pressed. I can successfully...
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