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.
-
-
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
-
Thanks mon2 I will have to check it and get back to you!Comment
-
Resistance to ground on PP2v5_NAND_SSD_0 is .427Comment
-
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
-
31.32 ohms.Comment
-
That's with red on ground and black on component. Other way around it starts at 11.1 and starts to drop.Comment
-
Does that number look correct?Comment
-
Anyone?Comment
-
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
-
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
-
I guess no one has any idea's what I might try next?Comment
-
-
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
-
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
-
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
-
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
-
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?
Comment
-
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
-
Does that give you any idea what it could be?Comment
-
Good day, friends. Got this problem with M1 macbook - it starts, chimes, tries to boot and stuck with a message "support.apple.com/mac/restore"
It works with DFU mode, but it's cannot be restored. With "revive" function - same problem. Internal restore mode doesn't work, as well as Internet Recovery.
There is no damage on the motherboard. No short circuits.
Could it be a NAND problem? (but usually, if NAND is dead - mac simply wouldn't turn on)
Thanks....10-08-2025, 02:55 AM -
Hi everyone - first time poster on here looking to embark on my first repair! Thank you in advance for any help!
My Macbook only turns on when the charger is plugged in and only the trackpad and fans show signs of life. The display, caps lock light and touchbar do not turn on. There was previous liquid damage to the touchbar but after cleaning and drying the laptop was operational for a year without any issues. There doesn't seem to be any sign of liquid damage to the board, at present.
What I have done so far:
- All of the routine diagnostic methods including... -
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... -
Dear friends,
a close friend of mine gave me this machine, she told me that the last days the fan was going high and that it was heating up too much for the usual things, and that suddenly one morning it didn't start anymore .
I opened it and inspected carefully with a high magnifying lens, found no oxydized spots but a short on PPBUS_G3H , then a blown U6903.
I changed U6903 with a new one, PPBUS_G3H became 558 (measuring with red probe to gnd , and black on F7000) , PP3V3_G3H_RTC 463.
Now when I plug the usbc cable (original Apple 61W power supply), nothing starts automatically,...
Comment