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Hello, we have an A2442 Apple MacBook pro with water damage. The MacBook uses 5v/0a on magsafe and 5v/.17a on usb c, we want to know how we can fix damage to UF800 chip and how serious the damage is. I have attached some photos of the damage for you to take a look at. .

Hello, We have Apple MacBook Pro that had corrosion on certain part of it. We washed it and clean using DI water and it is clean now. The laptop uses 20v, charges well 3amps usage. Caps Lock has activity, USB flash drive conenctivity is there. We dont have a graphic output. Even used external...

____________Customer_Board____________ PP3V8_AON -> .0001 ____________Working_Board____________ PP3V8_AON -> .3516

Can this happen automatically or intentionally by user?

Thank you very much. Why MacBook showing question mark? does it mean SSDs are dead but mac still works? or does it mean OS is corrupted? I want to understand why this happens.

We need to recover the data off of the Macbook, not reinstall the OS. Any other options?

Hello, We have an Apple MacBook A2141 that Flashes a file with a question mark symbol on the screen when powered on, it has no chime and uses 20.3v and 2.35a. Could a a problem on the logic board be causing this or could have the SSD chips failed? I have attached a couple Photos for you to...

3V8_aon -> .0v -------------------------------- PPVDD_ECPU_AWAKE -> .0V PP0V81_S1_SRAM -> .0V PP1V8_S2SW -> .0V --------------------------------- PPVDD_AMPH0_S2SW ->.0V PP1V2_AWAKE -> .0V PP0V575_S1_VDDQ0 -> .0v

Hello guys, We have a A2485 MacBook Pro that is using only 5v and .11a, when connected nothing happens at all. The customer said it is not water damage and some type of other failure. Here are some voltage readings of the main power lines. PPBUS_AON -> 12.3v PVBAT_AON_CHGR_R -> 12.30...

PPVIN_P3V3SD -> fluctuates between 10.82v - 12.24v PPVOUT_LUXE_XW -> 0.008v P3V3SD_PHASE -> 0.0v P3V3_AWAKE_SW_S -> 0.0v P3V3SD_VOS -> 0.0v PPBUS_AON_LUXE -> fluctuates between 10.82v - 12.24v PPBUS_AON -> fluctuates between 10.82v - 12.24v LUXE_COMP ->.510 PP5V_S2_LUXE_VDD -> stays at 0v, jumps...

Here is one component that was corroded in the schematic, which values should we be comparing the readings we get, and how do we know which are primary or secondary rails?

So the voltage on 12v lines are slightly fluctuating for example shows voltage 11.5-12.1 and changes frequently.

https://we.tl/t-5aGOxJktQY here is a wetransfer link for the schematics.

I attached file to this threat. See if you can download it. Thanks.

I am sharing schematic for this board with you. Please have a look. How we should know the correct values for components affected by resistors? Where it is written? Is it available in schematics? Please also guide how to easily find all secondary level power rails in schematics. thank you.

820-02935 051-08286 Rev 5.0.3 for Apple MacBook Pro

Hello, We have a A2991 MacBook Pro with a Board 820-02935-A that has some water damage around PPBUS_AON_LUXE and around PPVIN_P3V3SD, when connected to charge it uses 20V and .20A but after some time the USB Tester restarts and continues to restart. What should we be checking first? I...

These are the diode mode Measurements for the Patient Board. __With_out_Elements___ CR857/PBUS_AON -> 4.9 with beep __With_Elements___ CR857/PBUS_AON -> 4.7 with beep We also Have a Working Donor Board and here are its Measurements __With_out_Elements___ CR857/PBUS_AON -> 4.6 with beep...

Hey guys we have spotted a difference between elements on our board and our donor, I have attached a few photos for you to take a look at. This MacBook was looked at by someone else before reaching us, is it possible they have removed these elements? Is the difference of elements is related to...

Sorry my engineer made a mistake in measuring. Once we removed those to F5200 elements, we have 12.33v on the capacitor C5250. It looks like it has good voltage. Thank you for your patience. Please advise if we put them back or let us know what to test further.