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

zeydullak

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

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zeydullak

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

zeydullak

Member
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

Member
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.

1647292423753.png
 

zeydullak

Member
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

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