Re: 820-01041 Macbook Pro Not booting
its not static and it ranges from 4MΩ and then it slowly goes down to 1-2KΩ and then when I test again after a while it is high again and then slowly goes down again
aed040
Member
Last Activity: 01-03-2023, 03:47 AM
Joined: 11-23-2022
Location: NCR
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Re: 820-01041 Macbook Pro Not booting
I plugged the charger and its now pulling 2A @ 5v
If I plug it on the other USB port it is just using 0.8Amps
The voltage at PPBUS_G3H is cycling it goes up to 12.3v and then it goes down and then back to 12v again.
Cannot find anything hot on the board using a thermal camera except the CD3215 chips which is not really hot just warm.Last edited by aed040; 12-08-2022, 10:02 AM.Leave a comment:
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Re: 820-01041 Macbook Pro Not booting
resistance of PPBUS_G3H to ground is not static and it changes from 1MΩ to KΩ
C6900 resistance to ground is same as PPBUS_G3H and looking at the schematics it looks like they are indeed connected.
L6960 & L6961 resistance to ground is 6Ω that is also PP3v3_G3H_RTC_X so is this shorted?Last edited by aed040; 12-08-2022, 06:34 AM.Leave a comment:
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Re: 820-01041 Macbook Pro Not booting
I finally replaced U6960 and the short is gone. Good thing I bought 3 pieces of the IC because I failed on my first try and on the 2nd it did move to its correct place while heating it up. Hopefully I soldered it properly.
I also ripped the pads on C6900 because I accidentally pulled the wire that I soldered on the pad when I injected voltage. I already replaced the pads and waiting for it to cure before I solder back the caps.
Anything I should double check before I plug the charger?Leave a comment:
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Re: 820-01041 Macbook Pro Not booting
I used an infrared camera and U6960 is the only one glowing.
Is it still possible that the caps are shorted? I would love it to be the caps.Last edited by aed040; 11-25-2022, 09:22 AM.Leave a comment:
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Tips when soldering U6960/TPS62180
I am trying to fix my macbook.
Can you give me some tips when replacing the U6960 chip.
What Hotair temp and fan speed do you use?
How long do you usually wait before you can remove a chip? Ive been watching repair videos and they can easily remove a chip after a few seconds but I've been heating the part on a test board for almost a minute and it wont budge.
Does a really good flux help in melting the solder? I am not sure if my amtech flux is fake that is why its taking a long time.
The flux is also being blown away from the... -
Re: 820-01041 Macbook Pro Not booting
Against all the warnings on this forum I went ahead and increased my voltage to 2v and found that U6960 is heating up.
What causes this to fail? The last thing I did was I used a powerbank with a USB-C PD port to charge it. I did not charge it longer than 10 seconds. I was just testing the powerbank if it can charge it. I saw the thunderbolt icon on the battery and then I removed the USB cable. It was running the whole day when I left it on the table and then it wont boot anymore the next day. Can a faulty USB-C PD charger...Leave a comment:
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Re: 820-01041 Macbook Pro Not booting
I tried injecting voltage 0.8v and it is only pulling 0.06amps. Nothing is heating upLeave a comment:
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Re: 820-01041 Macbook Pro Not booting
How can I check if it is now safe to inject voltage?...Leave a comment:
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Re: 820-01041 Macbook Pro Not booting
No liquid spill
After removing F7000 and F7001 Pin 2 of F7000 has the lower resistance 22.9Ω
Pin 2 is the ISL side right?
Edit: After checking the schematics PIN 1 is connected to ISL so I checked the voltage and I am getting 12.29v now....Last edited by aed040; 11-24-2022, 12:35 PM.Leave a comment:
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820-01041 Macbook Pro Not booting
I left my wife's laptop running and when she is going to use it it is no longer booting.
Trackpad not clicking
Top right and lower left USB-C is reading 5v and 0.15Amps on the charger
Bottom right and top left USB-C is reading 5v and 0.08Amps on the charger
I only get millivolts on PPBUS_G3H @F7000 in both pin 1 and 2 when charger is connected
Resistance measurement without charger
Ground to PPBUS_G3H 22.9Ω
PPBUS_G3H to L7211 24.9
I also check the resistance with the charger... -
Re: 820-01041 MBP 15" '18 Schematics/bv request
Thank you this is just what I needed....Leave a comment:
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Re: New Members - please post your introductions here
Hello everyone new member. Same as neo, Software dev by profession but I love to fix stuff.
I am just glad that forums like this one is still alive because most of online interactions now is on facebook, youtube and tiktok.Leave a comment:
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