Macbook A2289 820-01987

[2informaticos]

Yes, if no LDO1 voltage...

 

[sourcensolutionsonline@gm]

I am looking for a U7800 but apparently I can't find any do you have any sites selling those ?

 

[sourcensolutionsonline@gm]

Right LDO1=0.00V and its diode mode reading to ground is 415

 

[sourcensolutionsonline@gm]

I had to order U7800 Chip new, they came in today and I removed and replaced U7800 but still 5.15V on my USB meter , here s the current voltages that i am getting at U7800

U7800 VOLTAGES

P3V3=3.3V

LDO0_IN = 1.1V

LDO1_IN = 3.3V

LDO2_IN= 1.8V

VIN_RTC = 3.3V

LDO 0 = 0.8V
LDO1 = 3V
LDO2=1.2V
LDO3=1.8V
LDO_RTC = 1.5V

U6903 VOLTAGES

VIN1/2 = 12.25V

EN = 5.13V
FB = 1V
VO=3.3V

U7000 VOLTAGES

P_IN = 5.13

AUX_DET = 1.25V
VDDA/P = 5.13
SMC_RST_IN = 0.00V

EN_MVR = 5.13
A/BMON=0.0V

Please let me know what would be a next move here , thank you very much.

 

[2informaticos]

Is the machine recognized in DFU mode?
If not, check voltages on the small coils around U7800.

 

[sourcensolutionsonline@gm]

I have not gotten it in dfu mode yet , But I will try that.

 

[sourcensolutionsonline@gm]

Yesterday I did not get to assemble the computer back together so Today I assembled it to check if the computer was in dfu mode , I first pressed the power button and the computer actually powered on normal with all the functions properly working , like , keyboard , screens backlight of the keyboard , trackpad sound perfectly working , but still stuck in 5v and wouldn't charge at all , I think we should focus a lot on the charging system now , Both of the CD ic's WERE changed, U7800 Was changed , U6903 Was changed only U7000 was not changed, let me know how we can move forward with that.

 

[2informaticos]

Stuck on 5V w/ and w/o battery connected?
Any error pops up in diagnostic mode?

 

[sourcensolutionsonline@gm]

Here s a short video of the computer.

 

[sourcensolutionsonline@gm]

I uploaded a short video , but one thing that I can see, with battery connected its 5.13V on USB meter and 0 amp and zero watts, and with battery disconnected its 5.13V 0.24 Amp and 0 watts but and not boot.

 

[sourcensolutionsonline@gm]

I did not see any error ,since its not even showing a charger is connected.

 

[2informaticos]

So machine only boots from battery.

Check UPC_I2C_INT_L.
Seems that you still have a problem on USB-C area.

 

[sourcensolutionsonline@gm]

Yes only boot from battery

I will check UPC_I2C_INT_L. , do i check voltages and Diode mode.

 

[sourcensolutionsonline@gm]

UPC_I2C_INT_L. in voltage mode its 1.8V and in diode mode 0.445

 

[2informaticos]

Check the software version in System Report.

 

[sourcensolutionsonline@gm]

Still waiting on getting the unlock password from the client, but in the meantime i wanted to bring this to your attention i have also made a short video , since I changed U2800 and U6903, all voltages are normal but even the macbook is turning on without going off when battery is connected , but in that short video you will see the T2 Behaviour with U6903 under my thermal camera , Let me know if that would give you any idea or something that you are familiared with. or I dont know if that T2 CHIP will need reballing. Iam trying to upload the video but it wouldnt let me ,is there any other way to upload the video.

 

[2informaticos]

Upload videos on external website and post the link.

 

[sourcensolutionsonline@gm]

here s the video link below.