Re: A2141 - 5V/0A - liquid damage
0Ω
0Ω
-
-
Re: A2141 - 5V/0A - liquid damage
Check the resistance to ground of each inductor on the board. Searching for a low measurement. Each inductor is a power rail which will use this same ppbus_g3h for the high side voltage feed to create the buck regulator. Again, no power to the board during resistance checks.Comment
-
Just wondering if anybody has seen this issue. I'm assuming that all of the CD3217's are semi functional for the chips to request 20V from the PSU.
This unit had some soda spattered up into the side vent. I ultrasonic cleaned the board, now getting this weird sometimes requesting 20V behavior, then it goes back to 5.2V ~ 25mA The U3200 jack cycles.
I'm hoping this is just an issue with some components between the TOP Jack and U3100 and not U3100 itself.
Not seeing anything unusual on thermals just some of the power supply inductors getting warm when it's requesting... -
Device Information
• Model: MacBook Pro 14” M1 Pro (A2442)
• Logic board number: 820-02443-05
Original Issue
The device suffered liquid damage, causing a short circuit on the logic board.
Near the audio jack area, the CR852 capacitor pad was severely burned, creating a clear short-circuit path. The board could not power on properly.
Work Performed
Removed the short circuit by drilling through the board (bypassing the short path) in the CR852 area.
Current Status
• When powered on, the screen shows support.apple.com/mac/restore....10-20-2025, 11:15 PM -
Hi. Recently serviced a damaged A1466 Macbook Air. Thought to post the issues and resolution for each.
Macbook AIR Model A1466 Diagnostic 09-01-2021
Issue: Liquid damaged (beer spill) Macbook AIR will not power up.
Problems & Resolutions
1) Attached Apple magsafe power adapter. No green / no orange light. This confirms the absence of the PP3V42_G3H voltage rail. The PP3V42_G3H rail is the primary voltage rail necessary to communicate with the magsafe power adapter to report the green or orange light status to the end user....09-01-2021, 09:31 AM -
Hello everyone,
I am new into this, sorry to post it here. I want to make this as a pet hobby project, as this mac is not urgent.
I have (Macbook Pro 13inch 2017mid) A1706 820-00923-A
My mac had liquid damage a long time ago, the connector from J8500 is damaged on pin 46 (PP5V_S0_ALSCAM_F), I guess the LCD/display panel is in short circuit, as I saw the connector from the LCD burned as well.
And the resistor L4004 is literally burned.
From what I see from the schematics, it does not affect any other rails, only the connection to the display... -
Hey everyone,
Had a MacBook pro 13" 2018 (A1989) come in for liquid damage. The only liquid damage was all around UB400. It was most likely soda, so there wasn't that much corrosion. I reflowed the UB400 and the QB chips with some flux, and replaced the caps/resistors that were in bad shape. Seemed to be working fine at first, but the next day when testing it again, the laptop charges and boots fine, the CPU would overheat, and U7210 would get to 70 degrees Celsius as well. I'm testing with only screen and battery connected at this point.
I can't figure out how...
Comment