A Macbook Pro A1278 (820-3115-B) displayed this. What problem is it.
Thanks.
Thanks.
Attached Files
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Last edited by Longmam; 12-18-2020, 01:42 AM. -
Re: A Macbook Pro A1278 (820-3115-B).
do try ram swapping , a ram slot or ram module could be failing -
Re: A Macbook Pro A1278 (820-3115-B).
Try removing RAM stick closest to keyboard.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Hey! This is a A1278 macbook 2011.
Problem: Not turning on / No green light
Im using by3200s charger.
Voltajes:
PPBUS_G3H = 12.26v
SMC_RESET_L = 3.3v
PP3V42_G3H = 3.42v
U7000 =
Pin 1 CHGR_AGATE = 0v
Pin 2 CHRG_DCIN = 19v
Pin 3 CHRG_ACIN = 4.6v
Pin 10 SMBUS_SMC_BSA_SDA = 3.3V
Pin 11 SMBUS_SMC_BSA_SCL = 3.3V
Pin 12 PP3V42_G3H = 3.42v
Pin 13 CHRG_RST_L = 3.3V
Pin 14 SMC_BC_ACOK = 0.8V
Pin 19 PP5V1_CHRG_VDD = 5.05V
Pin 20 PP5V1_CHRG_VDDP = 5.03V... -
Hello, I am looking for any and all files related to the mainboard for 820-2565-A (13" Macbook Pro A1278 mid 2012) schematics/board view.
I looked through forum search results and google and was unable to find a board view file, I found a pdf of all the schematics but I don't know where the parts physically are on the board as this is my first macbook board level repair attempt.
The macbook charger has a green light, the battery has been replaced and OS reports Normal status but Not charging. After cleaning a corroded capacitor it crumbled off the board. There... -
Subject: Help Needed: MacBook A1278 (3115) No PPBUS_G3H Issue
Hello everyone,
I'm working on a MacBook A1278 with the 3115 logic board and facing an issue with no PPBUS_G3H voltage. Here's what I've checked so far:- U7000 Measurements:
- Pin 3 has 0V, even though R7012 shows 16.5V from PPDCIN_S5_CHGR.
- Resistors:
- I measured R7010 and R7011 with one leg disconnected, and both tested OK.
Based on these findings, I believe U7000 needs to be replaced. However, I have a related question:- If I also decide to replace the SMC, do I need to order it pre-programmed,
- U7000 Measurements:
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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 -
Apple MacBook A1278 051-7918 820-2327 Schematic
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