Hi all, I am working on the Apple MacBook Pro A2159 Logic board # 820-01598-06. I removed the Logic board & it seems to be clean & no sign of liquid spill anywhere or any component. The problem is when I plug in the USB-C power adapter cable, It turns on, Voltage 20v & .42amp (Without the LCD Fex cable attached). And when I attached the LCD flex cable to the LB, I see the backlight for few sec which is very obvious, the amps on the amp meter keeps dropping to ZERO amp (In either case) & then the backlight disappears & restarts all over again. No image at all. But on one instance I saw the battery charge icon on the LCD screen when I did not plug in the USB-C cable. I checked the 3.3V which is perfect witout any errors & stable all over, but 5V is good for a while & the drops to 4.2v & restarts & back to 5V, which then turns on the logic board again, till this fluctuations happens once again. Any help or tips would be really helpful. Thanks in advance.
-
Last edited by mferna14; 11-05-2022, 03:46 PM. -
Re: MacBook Pro A2159 starts for 5 sec & off again
Hi. Check the resistance to ground of the 5 volt rail.
Check the current sense loop of the 5 volt rail to be sure no parts are missing. The local regulator for that rail may be incorrectly concluding there is a fault on this power rail due to the current sense circuit.
What are the voltages of the SDA and SCL lines on the battery connector? -
Re: MacBook Pro A2159 starts for 5 sec & off again
Thanks mon2., There does not seem to be short on the 5V power rail. The resistance is around 287K & keeps on geting low. & in this I see under the MS, no parts are missing.
Voltages of the SDA and SCL lines on the battery connector J6951, both are perfect 3.3 volts... I was checking Louis video on Youtube regarding this same problem, they even could not find teh fault, but I will try to sort it out. Any other tips??? ThanksComment
-
Hi everyone! I'm trying to fix my black screen / failed U8900 GPU v-core on my Mid-2012 Macbook Pro 15" Retinaby doing a rework/reflow of the chip (once I determine that's the real issue; but it likely is).
I've been disabling the GPU in NVRAM for a few years... but it's just time for a better solution.
I'm new to soldering but the only feasible way to fix this issue is to do something myself.
MY QUESTION:
I've been seeing some people (on this forum mostly) run into issues with the logic board needing a serial number or it being deactivated (?)... -
Hi all!
This is my first post and also one of my first "deep dives" into electronic repair. I'm used to doing basic tasks with computers, like SSD/CPU replacement, thermal past re-application, etc. So here's the story...
I have a MacBook Air M1 that I bought to repair (I know, I'm weird; though I'm a CompSci major and want to learn more
, and it will not display anything on the internal display. I have verified that there's no backlight, as I booted the laptop and shined a flashlight on it and there's no display; it does completely boot up, and shows fine on an external...
11-04-2024, 06:36 PM -
I need dump file for nand A2159 512GB with 2 Nand chips >.I upgraded 128gb to 512gb..I use P13 there are only 4Chips...
I need dump file MACBOOK PRO A2159
TSB4232(256)
TSB4229(256)
Thanks -
Hello...
My sister purchased an M2 MacBook Air a year and a half ago. While she was using it a week ago, it randomly shut off and no longer powers on. There are no signs of life and not even the MagSafe indicator LED lights up.
We took it to Apple and they disconnected the battery and tried a bunch of stuff before they declared the logic board "brain dead" and quoted us about £567 to replace it. Typical of them...
eBay replacements run about £367 with the Touch ID sensor included.
I did consider to probe the logic board for shorts... -
Hi everyone!
I have a 2018 MacBook Pro (with Sequoia OS) that I've been using for years with no problem. I recently received an M2 MacBook Pro so I'm mostly using it and not the 2018 one, but since a friend of mine needs a computer, I thought I could restore my 2018 and give it brand-new-like to my friend.
I tried using the built-in tool to restore the MacBook (Settings > General > Transfer or restore > Delete) but it got stuck when trying to remove the Find Device configuration (it asked me for the password for my old Apple ID -now I use the same account but...06-27-2025, 08:54 AM
Comment