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#1 |
Senior Member
Join Date: Feb 2017
City & State: Split
My Country: Croatia
I'm a: Knowledge Seeker
Posts: 168
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![]() I didnt repair macbooks before...
To cut long story short...my nephews were playing and one of them landed on the macbook on the couch ![]() So they ask me to take a look...i disassemble it completely...check the board and found two coils broken from the pads...and resolder them. When i plug the charger it goes green two seconds then orange light. Tried to power it (short R5116) ...but nothing...so i downloaded schematic...first i checked for short to ground but couldnt find any then i checked always present rails and i have all except last two. So: PPBUS_G3H, PPBUS_S5_HS_COMPUTING_ISNS, PPBUS_S5_HS_OTHER_ISNS, PPDCIN_G3H_ISOL, PPDCIN_G3H, PP3V42_G3H, PPVRTC_G3H, PP5V_S5 all these rails are ok, voltage present. No voltage on rails PP5V_S4RS3 and PP5V_S0. The resistence on the PP5V_S0 is around 63 kohm but on PP5V_S4RS3 is not stable...its rising indefinitely. I am not sure do i need a working battery to start it? i think its broken..but not sure...i left it overnight to charge but when i check it in the morning (without charger) the voltage on PPVBAT_G3H_CONN were 2,3 volt and droping. When charger and battery are plugged together i can read on PPVBAT_G3H_CONN connector somewhere arround 0,2 volt then jumps like 0,89v, 1,7v, 2,3v then back on around 0,2 volt and even lower. So, i think i covered everything in description, please advice where to look? ![]() Last edited by myth77; 11-26-2020 at 02:42 AM.. |
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#2 |
Moderator
Join Date: Jan 2016
City & State: Valbonne, 06
My Country: France
I'm a: Knowledge Seeker
Posts: 2,762
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![]() Power sequence always goes G3H → S5 → SUS → S4 → S3 → S0 → VCore. Go through the list of power rails measuring their voltage in that order.
You don't need the battery to be plugged in, but you have to use a genuine Apple Magsafe2. |
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