Zparts01
Senior Member
Last Activity: Today, 09:47 AM
Joined: 11-10-2021
Location: Ottawa, ON
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Anyone?
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Can anyone tell me with 100% certainty if there are any 'NOSTUFF" around the [B]PCAL6416A [/B]chips and if so can you please tell me what pads are supposed to be "NOSTUFF" as my schematic doesn't say for some reason and I have several that might be missing around these chips. I notice from close ups of the M1 and M3 boards that they don't appear to be empty, but on my M2 Pro they do. If anyone even has a 820-02841 logic board and can post a close up of that area that would be great!
[ATTACH=JSON]{"data-align":"none","data-size":&quo...Leave a comment:
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Thanks for the info mon2! Not sure why I didn't think to try to boot in safe mode, but I guess I was thinking if the built in keyboard was not working I could not do it. Worked with the external keyboard and I was able to complete the macOS setup. Only problem was, at the end of the setup, where is asks if I want to use dark mode or light mode, after selecting then clicking to get to the desktop, it shuts down again. After that it just boots to the login screen when I am not able to enter a password into the password field, as no keyboard works now. I can remember when I accessed the terminal...Leave a comment:
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820-02841 Problems
I have a 2023 14" MacBook Pro A2779, logic board 820-02841. I bought it off of eBay (probably my first mistake these days). The keyboard was destroyed and strangely enough many keys looked melted off. I found out was it was damaged by a liquid spill into the keyboard (looked like coffee) and maybe someone tried to dry it out with a heat gun and melted the keys, failing miserably. It was disclosed to me that the keyboard didn't work and that the MacBook would shut down right after clicking English (or any language) from setup and clicking to go to the next step. The power just goes off. If... -
Power rail is not being enabled or not being enabled mon2. Does this mean T2 is dead?Leave a comment:
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Thanks ugamazing! I was hoping it was not the T2, but seems that you may be correct. I did try to read the voltage to ground of pin #2 at P1V8G3S_EN and it was cycling from 0.00v - 0.01v and that's it. PP1V8_G3S is reading 0.320 when measuring resistance to ground. Is that the last of the testing I can to verify it's the T2?Leave a comment:
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I have been so busy I haven't been able to get to it, but thanks mon2 I will check this as soon as I can and write back!Leave a comment:
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Does that give you any idea what it could be?Leave a comment:
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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_G3SLeave a 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 = 0.519Leave a 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!Leave a 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 = 0vLeave a comment:
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I guess no one has any idea's what I might try next?Leave a 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.Leave a comment:
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Anyone?Leave a comment:
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Does that number look correct?Leave a 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.Leave a comment:
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31.32 ohms.Leave a comment:
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Resistance to ground on [B]PP2v5_NAND_SSD_0[/B] is .427Resistance to ground on [B]PP2v5_NAND_SSD_0[/B] is .427Resistance to ground on [B]PP2v5_NAND_SSD_0[/B] is .427Leave a comment:
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Thanks mon2 I will have to check it and get back to you!Leave a comment:
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