2019 Macbook Pro A2141 / 820-01700-05 / No water Damage / Does not Boot / no DFU

[zeydullak]

The SSDs on the side where we had a short are getting warm than other SSD on the opposite side.

 

[zeydullak]

On one side it is getting hot immediately which potentially be another short. Please check the pictures. Thanks.

 

[zeydullak]

Just checked the short between ground and big coils such as L7211 and L7221, the value is 2 Ohms which is direct short.

 

[2informaticos]

What voltages appear on the board?
Do you have both U9080/580 placed on the board?

 

[2informaticos]

CPU core coils have very low ohm value to ground as normal.

 

[zeydullak]

On USB-C amper meter --> votlage is 20v. PPBUS_G3H is 12.61v. After about 10 seconds it goes to 12.30v and then back to 12.61 stable. U9080/580 placed on the board. Both chips there. Both chips are taken from the donor board.

 

[zeydullak]

PP5V_G3H is 5.1v. 2/L9580 --> 2.52v

 

[zeydullak]

I used a thermal camera to shoot what temperate pattern on board. So U9580 is getting warm first then the SSD chip U9400 is getting hot. Check the picture below. there are 8 SSD chips on the board and only this one is getting hot all others are quiet cold.

 

[2informaticos]

That chip may be bad.
Do you get the same diode mode reading on L9080/580 (to ground)?

 

[zeydullak]

Hi there. I checked the diode mode reading from L9080 to the ground and it is 0.3029v and L9580 is 0.1275v.

I also checked these readings on a donor board and both numbers on diode mode to ground L9080/L9580 is 0.4042v. Please advise. Thanks.

 

[2informaticos]

You have to low reading on L9580.
At least one NAND chip got damaged; probably the one showed up on thermal camera.

 

[zeydullak]

If one chip got damaged, not possible to get this board alive. Correct?

 

[2informaticos]

I already passed you the link for a thread about this problem...

 

[zeydullak]

Yes, I saw that link. Almost the same issue. Thank you very much for your help. I learned a lot of valuable things.