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Macbook 12inch 820-00244 No PP5V_G3H No PP3v3_G3H

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Knu7Nuk3m

New member
Hi there,

i have an Macbook 12inch 820-00244 which had a Water Damage. I have already changed U3100 and Q3100 because it had a short on PPDCIN_G3H.
When i Changed U3100 i might have ripped of the TP_UPC_XA_DBG_UART_TX Pin. But i couldnt find it anywhere else on the Boardview. Is this Pin doing anything?

After i have Changed those two chips i read the following Voltages:

PPVBUS_LIO:5.20V
PP3V3R3V0_AON:3.0V
PP5V_G3H:0.2V / 6.62KOhms
PP3v3_G3H:0V /4.55KOhms

What i Noticed is that i dont have R3061. It was missing from when i started trying to repair it.
Can you help me out with this?

Greetings from Germany
 
D

dukefawks

Administrator
R3061 is "NO STUFF" so it is supposed to be missing.

PP5V_G3H and PP3V3_G3H should be there. PPVIN_G3H_P3V3G3H present? CHGR_LDO_P5V0 present? Any shorts around U7000?
 
K

Knu7Nuk3m

New member
Thanks for the quick reply.

PPVIN_G3H_P3V3G3H is at 5.20V
CHGR_LDO_P5V0 is at 5.0V
Around U7000 i couldnt find a full short but on C7966 i measured on the PPVCCIO_S0 Pin 193Ohms to ground which seems a bit low.
 
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dukefawks

Administrator
PP3V3_G3H is generated by U7000 and should be present. Do you have a power supply to inject 3v3 and monitor the current? If U7000 is dead you have a problem as you can only take it from a donor board, the new ones don't work!

SMC_BC_ACOK also present?
 
K

Knu7Nuk3m

New member
I will try that, but before i do so i want to confirm the following. I noticed I also dont have PPBUS_G3H. Am i right with the assumption that this has to be there before I can even get PP3V3_G3H or PP5V_G3H?
I measure only 1.4mV and 3.8KOhms to ground for PPBUS_G3H. The Line has a Capacitance of 1mF. Now Feeling a bit stupid for not measuring this in the first place.
Is PPBUS_G3H also generated in U7000?
SMC_BC_ACOK is at 0.002mV

I hope its not U7000 because harvesting and reballing this from an Aliexpress Board seems like my personal hell.
This one wouldnt work? https://store.rossmanngroup.com/e8-isl95530hiz.html

Also is it ok to have only 11 Ohms to Ground on PPVCORE_S0_CPU on this Board?
 
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K

Knu7Nuk3m

New member
I tried injecting 3.3 Volts. The PP3V3_G3H Line pulled about 50mA from the Power Supply. I couldnt find anything that gets warm.
I also tried inserting 8.6 Volts to PPBUS_G3H. When I did this i successfully got PP3V3_G3H and PP5V_G3H.
I Get 0.2-0.3MOhms to Ground on PPBUS_G3H
Do I see correct that U7000 only Generates CHGR_BOOT1 and CHGR_BOOT2 and Q7020 makes this PPBUS_G3H which then flows to the System and also back to U7000?
Or is PPBUS_G3H also being created directly inside of U7000? Because i am getting CHGR_BOOT1 and CHGR_BOOT2 (both at 4.7V). Wouldnt that mean i either have a Problem with Q7020 Q7010 or with the Circuitry around it?

I have Plugged in the USB C Charger again and the Voltage on PPBUS_G3H slowly (About 5 Minutes) rises from nothing up to 0.7 Volts when adding a bit of Alcohol on the Board. When its evaporated it decreases again. Should i try a reflow of U7000?
 
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dukefawks

Administrator
ACOK should be present when charger is connected. You are using an original Apple charger and USB-C cable I hope? No messing with Chinese crap there!
 
K

Knu7Nuk3m

New member
Yes it is an original charger. But I currently dont have another device to test if the charger itself is ok or if it has been killed with the dead U3100. But at least it delivers the 5.20V on PPVBUS_LIO.
I guess I will try my luck with reflowing U7000. If that doesnt work i will order a donor board from Aliexpress.


Okay it didnt work. Do you know where i could find a stencil that fits to reball this chip?
 
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