A2681 820-02872

[kashitozu]

Hello,

I have an A2681, it got wet, the customer brought it back to another store and then to us.

I found oxidation on the backlight area, next to UP950, UR630, and UR600.

We also found some oxidation on UF 350. I cleaned it and replaced it.

Before, it wouldn't start, but I replaced UR630 and UR6000 and now it starts, but sometimes the backlight is weak and I noticed that when I clip the motherboard onto the chassis, the backlight doesn't work, but when I don't clip it on, it works.

When I have the backlight, I get to the session password, but the chassis keyboard and mouse don't work. When I use a USB-C adapter to connect a keyboard and mouse, they don't work either.

Now, the backlight is always dim, even though I haven't touched the motherboard.

On the UP950, I have power coming in on PPBUS_AON (12V) and on the FP800 fuse I have 0V.

Do you think that's the problem?

The data is extremely important and my goal in repairing it is to make a backup.

If I do a swap, can you tell me which components to swap? Thank you.

 

[2informaticos]

Do you get external video?

Which schematic using there?
Check MLB code (02536 maybe), not KB daughter board.

 

[kashitozu]

No, we don't have any external displays.


The exact reference number for the motherboard is 820-02536-A.

 

[2informaticos]

You don't have TV/monitor for test, or you don't get external image?
Test closing the lid, once the MacBook turns on.

 

[kashitozu]

I have a screen, but I don't get any display when I connect the Mac externally. I tried connecting and disconnecting the screen cable.

I tried closing the cover, but got the same result.

 

[2informaticos]

Do you still get dimmed image on internal screen?
Caps Lock LED reacts?

 

[kashitozu]

yeah same thing in internal screen.
i have say the internal keyboard not working.

 

[2informaticos]

If you still see something on the screen (even dimmed), try to share the disk for data recovery through USBC.

 

[kashitozu]

As I said at the beginning of the post, I don't have backlighting, the USB-C ports don't work, and the keyboard and trackpad don't work.

You didn't answer my question. I asked: If I do a swap, can you tell me which components to swap?

 

[2informaticos]

What kind of swap?

Just in case, check UR300 input signals; w/ and w/o JT201 connected.

 

[kashitozu]

motherboard swap with data and i say the value after

 

[2informaticos]

I don't really understand what you mean.

SSD encryption key is stored into CPU.

 

[kashitozu]

To swap data, what components do I need besides the CPU and NANDs?

For example, on an iPhone, you need the EEPROM with