Macbook A2141 820-01700 A

[sourcensolutionsonline@gm]

Hello , looking for some help here,

this macbook came in a cup of coffee dropped on it , I found serious impacts on the back side of the T2 chips also the area of U7000 Chip, its stock on 5V on my amp meter PPBUS-G3H diode mode reading is fine but when checking the voltage i am only getting 0,0065V , Can i get some help please?

 

[2informaticos]

Remove F7000/1 and check C7050 voltage.
If still low, post U7000 basic voltages; P_IN, AUX_DET, SMC_RST_IN, VDDA/P, AUX_OK, EN_MVR, A/BMON.

 

[sourcensolutionsonline@gm]

With F7000/1 Removed, C7050 = 0.166v

P_IN =5,19V
AUX_DET= 0.060V
SMC_RST_IN =0.032V
VDDA/P=5.04V
AUX_OK can't find it anywhere on the boardview

EN_MVR= 0.00V
A/BMON= 0.00V

 

[2informaticos]

"AUX_DET= 0.060V"
Fix this problem.

Check first diode mode to ground there.
If good, replace R7015; be sure R7016 is good also.
If low, probably bad U7000.

 

[sourcensolutionsonline@gm]

Will definitely try that , but U7000 was already replaced by a new one , I have a quick question for you , sometimes those new U7000 chips they dont work , would a reballed U7000 work?

 

[2informaticos]

Always better to reuse U7000 removed from working board.
Just be sure to reball and solder it correctly.

 

[sourcensolutionsonline@gm]

Ok Great , some of the new Chips they are garbage I can tell. I will try that tonight and get back to you .

 

[sourcensolutionsonline@gm]

I have replaced R7015 I get my 20V now but the USB meter keeps going off and on i have made a short video on this link below, to see what happened.

 

[2informaticos]

All USB-C ports have the same behavior?

Check diode mode to ground on all secondary power rails (big coils).
Don't forget 2V5 SSD (small coils).

 

[sourcensolutionsonline@gm]

All the USB-C ports has the same behaviour , one thing that i noticed when F7000/1 is off the board the device is stuck on 5v but not restarting on the amp meter , I have checked the coils on diode mode comparing to the schematics value , they are all fine but because of the restarting behaviour on the amp meter that does not allow a stable connection , I Cant seem to get the correct voltages , Do you have a list of the segondary voltages that you can guide me with please?

 

[2informaticos]

Stable PPBUS_G3H and 3V3_G3H_RTC, if both charger and battery are connected?
BTW, this machine requires 96/140W charger.

 

[sourcensolutionsonline@gm]

I have a 87W Charger would that cause my issue?

PPBUS_G3H with /without battery unstable since Amp Meter keeps restarting , when promptly connected i am getting 12.2V then going down to 5.2V when Amp Meter goes off

3V3_G3H_RTC is stable with and without battery Battery

 

[sourcensolutionsonline@gm]

I was doing a quick vision inspection i can see that C7029 and C7026 the tap cover is broken but they have good resistance to ground , would that be part of my issue?

 

[2informaticos]

Get the correct charger for this machine!

Remove mentioned caps temporary.
You can resolder/replace them, once the problem is fixed.

 

[sourcensolutionsonline@gm]

Great , i will definitely do that and keep you posted.

 

[sourcensolutionsonline@gm]

I tried a 96W charger and i am still getting the same behavior of Amp meter restarting.

 

[2informaticos]

Can you put the machine in DFU mode?

Try to get a good battery, which holds some charge and test again.

 

[sourcensolutionsonline@gm]

I have not tried to put it in DFU mode yet , I ran another inspection under a Thermal Camera U 6960 is the one blinking off and on , Would that have anything to see since i am still getting the 20V at the USB Amp Meter?

 

[2informaticos]

U6960 should be good, if you get stable 3V3_G3H_RTC.

Check what happens with U7800 LDOs, SLPS2R and AWAKE voltages.

 

[sourcensolutionsonline@gm]

Will do that.