Hi Sancho Marcelino,
thanks for the guide but by doing all the tests I checked:
Where on the 2 pins of the battery data exchange (Present)
the battery is charging correctly in fact the power supply starts to absorb about 2A.
If I disconnect and reconnect the battery the macbook starts and works and sees the battery charged with the percentage.
If I put the mac on charge during use, the battery charge increases and works well.
the problem is present only and only if the battery discharges to 0 and I put it on charge, the power supply charges it because the absorption...
dclass-pro
Senior Member
Last Activity: 03-20-2025, 10:32 AM
Joined: 12-14-2022
Location: Lecce
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Hi and thanks for the very detailed guide, but I started checking these points:
"You measured ADAPTER_SENSE = 2.8V.
The normal range should be around 3.3V.
If ADAPTER_SENSE is too low, the MacBook may misread the power of the charger → limiting the charging power.
What to check?
Measure the voltage on the divider R7011 (1.87MΩ) and R7012 (1.1MΩ)."
but on my schematic R7011 is 10k and R7012 is 68K, I don't know if the guide is reliable.
ThanksLeave a comment:
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[B]if I short circuit the tester probes the value I get is 0.3ohm[/B]Leave a comment:
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[B]PM_BATLOW_L[/B] is 3.34V without battery connected, but only with charger connected[B]PM_BATLOW_L[/B] is 3.34V without battery connected, but only with charger connectedLeave a comment:
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on pin ADAPTER_SENSE have 2.8vLeave a comment:
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on the PPBUS_G3H I have 10.11V without the charger connected, when I connect the charger I have about 11V which increases very very slowly
I confirm that with the battery disconnected on PPBUS_G3H I have 12.65VLast edited by dclass-pro; 03-06-2025, 04:45 AM.Leave a comment:
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Hi guys, sorry for my absence but I wasn't in the lab, yes I'm still having problems and I can't figure out where it's coming from.
What do you recommend I check?Leave a comment:
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thank you for the explanation but the macbook is an A1502 and does not have usb-c...Leave a comment:
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Good morning, thanks for the reply, I changed both U7000 and Q7130 but on PPBUS_G3H when I connect the caticator I always have 10.7V but never 12.5V.. what can I try to see?Leave a comment:
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I confirm that the dual mosfets @ Q7130 and also Q7180 are not predictive, I compared them with another recovery board that I have here in the lab and they are the same, do you advise me to change the charger?Leave a comment:
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resistor R7151 - 2,4ohm
resistor R7152 - 0,3 ohms.Leave a comment:
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Have 4.5ohmLeave a comment:
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PIN1 = 18,64V
PIN2 = 12,68V
PIN3 = 18,40VLeave a comment:
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[B]SMBUS_SMC_5_G3_SCL - 3,4V
SMBUS_SMC_5_G3_SDA - 3,4V[/B][B]SMBUS_SMC_5_G3_SCL - 3,4V
SMBUS_SMC_5_G3_SDA - 3,4V[/B]Leave a comment:
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the power supply is original but I also tried with my bench power supply, I have a current draw of 2.3A because it charges the battery but if I press the power button it doesn't turn on, if I disconnect the battery and reconnect it then yes, it turns onLast edited by dclass-pro; 02-28-2025, 08:58 AM.Leave a comment:
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I tried to change it but the problem persists, the charger LED is orange but the macbook doesn't turn on and the fan doesn't start, if I leave it connected it actually charges the battery but the mac doesn't turn on, it only turns on if I disconnect and reconnect the battery...Leave a comment:
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macbook A1502 not charging if battery is at 0
Hi guys,
I have a macbook A1502 that does not charge if the battery is completely discharged!!
If I unplug it and reconnect it to the motherboard it starts to charge well, and it charges up to 100% and works.
If I let the battery completely discharge, and connect the charger, the magsafe2 LED turns orange but it never charges the battery.
What do you recommend I try?
I tried to change the battery with a new one and the problem did not solve it
Code mainboard 820-3476-A -
Thanks for the reply, I confirm that they are all very high resistances, I also tried to change the PQ20 mosfet but the result does not change, I also changed the charger... same defectLeave a comment:
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Hi guys, has anyone ever had this defect?Leave a comment:
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HP Notebook With Strange Defect Does Not Turn On
Hi Guys, I have a HP DAX12AMB6D0 REV.D with a strange defect, that is on the 2nd mosfet on the power supply, the gate voltage does not reach 25V but pulses... if I try to touch some capacitors with my fingers, the voltage on the gate reaches 25V and the notebook turns on.
I have already tried to change the charging connector, PU1 and PQ20 but I have not obtained any result, the problem still persists.
Here are the voltages that I find ON PU1:
Pin 1 - Pulses between 2 and 3v
Pin 2 - Pulses between 2 and 3v
Pin 3 - Pulses between 2 and 3v
Pin 4 - Pulses between...
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