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Excellent. Replace U6903 and consider to also replace the dual common cathode diode and test again.Comment
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Okay, so I think I have it sorted. Upon testing R6907, instead of 2R2 ,I was getting around 62 ohms, I replaced it with a new resistor, and tested and the charger immediately went to 20V.
Im getting 3.4V on R6923 (while on the board) and Im getting 12.61V on PPBUS_G3H.
D6902 is also bad though, as when I put it back on the board instead of the wire I had for testing, it no longer was getting 20V from the charger and the other voltages also dropped to the old values.
A new diode (need to source a replacement, would windows laptops have similar ones?) and it should be back up and running!
Really appreciate your help on this mon2 you really helped with the whole troubleshooting process. Thank youComment
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Bravo! Well done. The least I can do for the great music from your side
(U2 / Pogues / Van Morrison)
Yes, you may be able to find one on the charger IC of any laptop. It will be used in a similar way - one anode will be from the battery / other anode from the DC power adapter. Cathode to the charger IC to power via VCC pin. However the physical fit may be a bit off but will work if you can squeeze it onto the PCB pads. Worth a try.
Otherwise...
D6902 = BAT30CWFILM
BAT30CWFILM STMicroelectronics | Discrete Semiconductor Products | DigiKey
Mouser should also have stock of these.Comment
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Good taste in music I seeBravo! Well done. The least I can do for the great music from your side (U2 / Pogues / Van Morrison)
Yes, you may be able to find one on the charger IC of any laptop. It will be used in a similar way - one anode will be from the battery / other anode from the DC power adapter. Cathode to the charger IC to power via VCC pin. However the physical fit may be a bit off but will work if you can squeeze it onto the PCB pads. Worth a try.
Otherwise...
D6902 = BAT30CWFILM
BAT30CWFILM STMicroelectronics | Discrete Semiconductor Products | DigiKey
Mouser should also have stock of these.
Perfect, I will have a quick look at some boards I have here, if not I will order from a local electronics site, they seem to have the exact correct one (although they have a MOQ of 25 lol).
Thanks again and enjoy your day! (or night lol)Comment
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Hello! I'm trying to resuscitate a Macbook that the local tech gave up on. I have the board view and schematic and have the main board out of the case.
Of the 4 usb-c ports, 3 cycle at 5V - they all go up to about 1.5A, then seem to switch off, back to 5V 0A, up to 1.5A, and off again. The cycle lasts a few seconds - maybe 3s.
The 4th port doesn't cycle and draws ~0.5A at 5V consistently. It seems it's the port linked to U3100 - it's on that side of the board and is the port closest to the battery and the CD3215C00 chips.
I've read that the CD3215s are... -
Hello,
I am looking for the boardview file and the matching schematics (PDF) for the following MacBook Pro:- Model: A1707
- 15-inch, Mid 2017
- 3.1 GHz Core i7
- 16 GB RAM
- Radeon Pro 560
- 1 TB SSD
- Board number: 820-00928-A
Thanks in advance!
Greetings from Germany...09-16-2025, 06:43 AM -
Hi guys I have a Macbook a1707 with motherboard 820-00281, without liquid damage that behaves strangely, with the battery connected the Macbook does not turn on and the USBC meter stops at 5v in loop, when I disconnect the battery the Macbook turns on and works fine, I have already tried to replace the battery twice without success, as soon as I connect the black cable of the battery the Macbook does not turn on, it stops at 5v and in loop. -
Hi,
I have a MacBook Pro 13 inch A2238 M2 and it was stuck 5V with 0 amps. I measured some important lines and I found a short on PP3V8_AON_MPMU_ISNS_VIN, I tried injecting 1v and I saw heat coming from the mPMU so I removed the pmu thinking that was the problem. I don't know why I didn't check the other side of the border but there it was, a shorted cap. I replaced the cap and the short was gone, so I reballed the PMU and put it on again but voltage was still stuck at 5V and the current was fluctuating between 0 and 0.45 amps. I checked under the thermal camera and I saw the mPM...04-02-2025, 05:02 PM -
Hey guys,
I got a MacBook Pro a1989 820-00850-A dead for repair. The MacBook itself was off for a month or so and it didn't power on. I tested using ammeter and it was stuck on 5v. Opened the machine and found a short on ppbus_g3h, corrosion near the right spkr_amp. removed the spkr_amp and saw short on ppbus_g3h. plugged in to power, boosted to 20v .600A and then back down to .300A. Trackpad was clicking when on .600A but no image etc.
Later, I tried again but it dropped down to 5v and never boosted back to 20V. checked board again and found ppbus_g3h shorted again....Yesterday, 08:45 AM
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