PP3V3_G3H_RTC_X is 3.3V. PP1V8_SLPS2R have 1.81V. U6940 pin 10 are at 0V
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Short / press the power button @ SWK002. Does this change anything.
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nothing changes. CHGR_RST_IN stays still at 0V. Faulty U6940? I Tryed it to reflow it too with flux and nothing changed. is there any mod for bypass U6940 for testing before i order then a new one?Comment
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What is the default voltage to ground on PMU_ONOFF_L? This should be a logic '1' since there is a pull-up to PP3V3_G3H_RTC_X @ R8015. When the power button is not pressed, the default voltage should be 3v3. There should also be a button or shorting pads @ SWK000 (opposite of the PCB) for the same purpose.Comment
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i replaced now U6940 with one of a know working board but icloud locked. Pin 10 still 0V. Voltage at R8015 is 3.3V.Comment
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that board is strange. all volltages are here. looks like a broken t2 firmware now but i cant enter dfu mode. when i check on the pad dfu_status stays at 0V instead of 1.8VComment
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mb code:820-01827-A;
sn:C02Z349ALVDR;
i9 32GB Ram 1TB
Hi, I found short on one of 6 black nand (total 1TB).
i removed all 6 nand ( voltages all ok) and now i want to program with JC P15 but for A1990 2019 there is only 512GB configuration.
I try A2141 1TB configurazion with TSB4228 but the position on pcb is different ( U9300 and U9400 is no stuff on A1990 but present on A2141 and U8800 and U8900 is no stuff on A2141 but present on A1990 )
macbook with A2141 configuration run on recovery but don't complete it.
anyone can help me?05-26-2025, 09:27 AM -
Hi,
my MacBook Pro 15" 2018 Touch Bar (A1990) doesn't charge anymore. Board# 820-01041-A
I'm not experienced in diagnostics, but I want to try to solve the problem with your help, because every local shop charges around 600€ (650 usd). Which is the value of the whole Macbook.
The Macbook was charging when suddenly the "charging sound" appeared every other second for around 4-5 times.
After that the Macbook was dead. It isn't charging anymore.
The USB-C Port where the charger was plugged is burned. Also The Cable and the... -
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 currently working on a Macbook Pro A1990 (motherboard 820-01041) which is not charging.
The Macbook consumes 5V and 0.019A at USB-C. There seems to be a partial short-circuit on the PPBUS_G3H rail as I have 0V on this rail.
I've physically separated (by removing F7000 and F7001) PPBUS_G3H and the ISL9240 charging chip to see which side the short is coming from. Removing these fuses gives me 12.6V at the output of the ISL chip (PPVBAT_G3H_CHGR_REG).
However, I can't work out exactly why I don't have the PPBUS_G3H rail.
Here are the values... -
Hi,
I received a 2018 MacBook Pro A1990 for repair, and the motherboard was replaced, presumably purchased on AliExpress. The motherboard's activation is blocked because the previous owner didn't delete it. Does anyone have a solution to this problem? I called Apple, and as expected, they asked me to activate the process with proof of purchase for the original computer, which I find very difficult, so the proof of purchase from AliExpress will be of little use. Any suggestions? Thanks.
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