Hi. I am in need of some assistance. I am trying to track down a short in this board and I am having limited success. Fuse F7140 is blown and I have removed U5450, R5450 as well as fuse F7700 and the short disappears past these components but I am unable to locate it. The only thing I can think of is that it has an internal short within the board. Any help would be appreciated. Thanks
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Re: MacBook Air 820-00165 PPBUS-G3H Short to ground
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Re: MacBook Air 820-00165 PPBUS-G3H Short to ground
did you find out what was causing it?Comment
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Re: MacBook Air 820-00165 PPBUS-G3H Short to ground
Hey!
I have solved this type of issue once before on this exact board. Pin one side of F7140 was getting the 8.6v but the pin 2 side was shorted to ground. The fuse was blown as well. I didn't have the means to inject voltage so I replaced the fuse. Once I did that the pin 1 side of the fuse became shorted to ground as well. I then plugged in the magsafe and dripped alcohol all over the board to see if anything got super hot. This is when I found C7313 sizzlin'. After replacing it, I got fanspin and the board was fully functional. The short was gone. Hope this helps. There are a lot of capacitors on the G3H line that could be blown and shorting to ground.
This is my first post. I wanted to post regarding sourcing the F7140 fuse. I have another Air with a similar issue and don't have any fuses left on donor boards.Comment
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hello everyone , working zebronics power suply 450 watts , 5v ,3.3v givin short to ground black wire, also in circuit at output, resistor was charred but shows right values , after removing resistors 39ohms, 51 ohms, there was no short , no continuity beeps with ground , but after replacing new resistors (now i am not switching it on) ,again short still exists . when i put bigger ohm resistor like 100k ohm , no short beeping sound comes , lower ohm resistor gives continuity beeps ,other big ones donest , as its a working psu , i am confused what to remove now or how to go further now .
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Greetings to the entire forum, I ask you for help because I'm going crazy. A dear friend of mine gave me a macbook pro M1 A2338 that only works with an external screen. With the internal one, no backlight or image. Only the external display is detected from the system settings.
First I changed the display flat, then I made a backup with time machine and tried a reset in dfu but nothing to do, always the same problem.
I analyzed the logic board, it shows no sign of liquid or visible damage. I then moved on to examine the logic with the thermal camera and found that the UP701 chip was... -
Greetings to the entire forum, I ask you for help because I'm going crazy. A dear friend of mine gave me a macbook pro M1 A2338 that only works with an external screen. With the internal one, no backlight or image. Only the external display is detected from the system settings.
First I changed the display flat, then I made a backup with time machine and tried a reset in dfu but nothing to do, always the same problem.
I analyzed the logic board, it shows no sign of liquid or visible damage. I then moved on to examine the logic with the thermal camera and found that the UP701 chip was... -
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 everyone,
I have a A1990 which had a blown inductor next to the display connector. There was no short at this spot, so I replaced it.
I noticed that the big coils above the GPU/CPU (PPVCORE) had a pretty low resistance (2.2Ohms). I already talked about this with mon2.
PPBUS_G3H, PPBUS_HS_CPU showed 1.8ohm to gnd. So I removed the R5400 to seperate the two rails. PPBUS_G3H is fine again but the short is unfortunately on PPBUS_HS_CPU. Sounds like a no fix to me.
Plus I can't find any particular spot which his heats up when I inject 1V@max2A
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