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So I've got this motherboard - 820-01949-A from an A2251 13" macbook pro. I am told the board previously had liquid damage (not told where on the board the spill was) - there are no visible signs, but it was cleaned about 2 years ago and stored since then. All four USB-C ports show 5.1V at 0.24A...

3 out of 4 USB-C ports show a current draw of 0.23A at 4.8V while the 4th port stays at 0.00 A. I am told that the machine was severely soaked inside and run with the water still inside. There's residue visible around 3 small chips next to the left side CD3215 chip as well as at some capacitors...

No history available, unfortunately. Which CPU and GPU rails should I check? And yes, I'll make a backup.

Actually, when I have the battery plugged in, my type C charger doesn't even detect anything - no voltage or current shown. When I remove the battery, though, and plug in the rear USB-C port, the charger reading fluctuates between 0 and 0.65-ish amps. If I plug in the port that's towards the...

Got a 2016 A1707 MacBook Pro with an 820-00281-10 board (Not sure what the difference between this and the 820-00281-A is). The laptop powers ON, the fans spin, touchpad haptic feedback works, but there is nothing on the display or touchbar, and the Caps Lock light doesn't do anything. My first...

I changed the battery for another used one, and the laptop started working fine. The little screw on the battery BMS PCB that the motherboard's terminal mounts to was stripped. The battery had worked with my other A1707 motherboard, but not with this one - not sure why. Anyways, thanks for your...

Welp :-( My other A1707 board works just fine with my 65W charger. Is it only the 2016 A1707's that will act up?

Not an 87W charger. I'm using a 65W universal USB-C charger. Battery works, yes.

My mistake. I did something wrong while measuring the other board. The resistance is about the same. What else should I check?

Resistance across C7020 and C7023.

the resistance is much higher on a working board, i presume that short is my issue then. do you have any suggestions how to trace the short in that circuit?

SMC bypass mode did not help, still no signs of life. Resistance across both C7020 and C7023 is 3.6 ohms.

Got an 820-00928-A (no liquid damage, but a crude battery replacement some time ago, was working until now). Doesn't charge - USB-C port stays at 5V 0.2-0.3A, and bootloops every few seconds. BUT - if I leave all power from the board disconnected for some time (like 15 minutes) then plug in the...

The laptop had drinking alcohol spilled on it. Cleaned the board with (isopropyl) alcohol, replaced the keyboard, a week later it's dead with no power. When you plug in a charger, the LED on the charger lights up green. If I disconnect the battery from the motherboard and then plug the charger...

No luck. I get the exact same errors with the LCD disconnected. I did connect the charger cable before the DFU cable (I'm using a white Apple USB-C-to-C charger cable). Target laptop does take current from charger - switches between 0.4 and 2.22A at 20V (mostly at 2.22 except while rebooting). I...

I have an A2337 M1 MacBook Air that had coffee spilled on it, but there was no liquid at all visible on the logic board or audio/power button board. The laptop was stuck booting to the boot options menu, and if I tried to pick Macintosh HD it would pause, then reboot back to the boot options...

Found EN_VR1, as you said it's on the schematic. My boardview has it labeled as "PM_EN_P3V3_G3H". Voltage: 3.39V The two USB-C port certainly do NOT have the same behavior. One does not even light up my power meter, and board voltages are very low (compared with what I've been posting here from...

I forgot about this thread after fixing the machine - just wanted to say thank you. The short to ground in this machine was indeed one of the capacitors in the set of C8460-73. I replaced it with a capacitor from a donor board and the machine worked perfectly. Thank you so much!

> Why continue doing that??? Sorry, I must have misunderstood, I thought that was one of the things you wanted me to test, when you said stop to check ohm scale or diode mode with power applied to board. By "power applied to board", did you mean the method of injecting 1V? Measuring between...

(I typed this a few days ago and apparently never hit Post!) R7020 appears to be an SMD component who's terminals I can't access. Measuring the lines connecting to it, though, all 4 of them are at 19.98V. With the USB-C cable connected to what would have been the rear port in the laptop, I get...