Re: Macbook 820-3115 missing 3V42_G3H
Pin 10 = 0.7 ohms to ground ?
To me, U7600 is defective.
Pin 10 = 0.7 ohms to ground ?
To me, U7600 is defective.
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Re: Macbook 820-3115 missing 3V42_G3H
Removed U7600 the part itself was reading 10,8Mohms on Pin 10.
On the logicboard Pin 10 is at 1 Ohms.Comment
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Re: Macbook 820-3115 missing 3V42_G3H
So with U7600 removed, pin 10 on the logic board is ~1 ohms to ground ?
What is left on the logic board that is mating with pin # 10 pad of U7600 on the logic board ?
Someone is causing this rail to sink.
Is L7630 still onboard or on a single leg ?Comment
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Re: Macbook 820-3115 missing 3V42_G3H
Yes L7630 is still completely onboard.
C7630 is mating with pin 10.Last edited by Nuld_; 07-02-2022, 11:27 AM.Comment
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Re: Macbook 820-3115 missing 3V42_G3H
Lift up one leg of L7630 OR remove current sense resistor R7640 (may be easier). Will need patience and flux to heat up this area since the inductor is able to support 20A of current. If indeed it is the inductor then this leads to the CPU which I believe will be the CPU causing this short event. Confirm it.Comment
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Re: Macbook 820-3115 missing 3V42_G3H
I´ve removed R7640, the readings on the board are:
Pin 1: O.L
Pin 2: 0,7 Ohms
Pin 3: O.L
Pin 4: O.LComment
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Re: Macbook 820-3115 missing 3V42_G3H
Not at my computer but pin #2 is towards the CPU ?
The CPU appears to be shorted. Wait on advice from others but CPU is very likely damaged from this reading.Comment
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Re: Macbook 820-3115 missing 3V42_G3H
Yup it is towards the CPU, I guess I will have to focus now on the other defective Logic Board. Nevertheless thanks a lot for your help
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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... -
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 -
Hello. I would need some advice please.
My son's MBP suddenly stopped working and is now only getting the green-then-orange light on Magsafe and no fan spin.
He brought the MBP into the house (22 deg C) from a very cold conservatory (-3 deg C) and turned it on straight away. The Mac suddenly died a few minutes later.
I examined the logic board and couldn't find any signs of water damage, corrosion, blown up components etc. Nothing was ever spilt on it, and the logic board looks immaculate.
I have already replaced the logic board with another... -
HI all, I am working on Apple MacBook A1398 logic board # 820-00138-A. The problem is that it does not turn on & no fan spin. Board is very clean & no sign of liquid spill. Upon checking the initial troubleshooting power rails, I found that its missing 5V (Absolute 0V on the Coil L7720, no pulsing at all, it's just 0V). 3.3V is PERFECT & across all points on the logic board. Checked the IC U7501 pin 4, this pin should have the ENABLE volts to turn on the 5v rail, & P5VS4_EN is missing. This signal generated from U8170 pin 4. PM_SLP_S5_L is also not present & ALL_SYS_PWRGD is... -
Dear community,
this is my very first post, I am quite new to macbook repairs, and I am excited:-)
I have a 2011 MacBook Air 13' that does not power on. No fan spin, nothing.
Here are the specs:
MacBook Air Mid-2011
CPU: 1.7 GHz Core i5 (I5-2557M)
Model: A1369 (EMC 2469)
RAM: 4 GB
VRAM: 384 MB
The first question:
Unfortunately, it came with a 'fake' power adapter which seems not to talk to the computer. Sometimes it does show green light immediately after connecting it to the board,...
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