A1466 SSD ISSUE

[Instafixx]

82-00165
Device came in with intermittent hang issue.
Turned it off and now it wont turn on. Will give the question mark folder.
Green below U5110 and U8010. Replaced both. Still the same

Checked U3740 No Shorts.
P3V3SSD_VMON 0V
SSD_RESET_CONN_L 0V
SSD_CLKREQ_CONN_L 0V
SSD_PWR_EN 0.5V

 

[2informaticos]

Post ALL U3740 voltages.

 

[Instafixx]

Pin 1 3.4V
Pin 2 3.3V
Pin 3 3.3V
Pin 4 0V
Pin 6 0.4V
Pin 7 0v
Pin 8 3.4V

 

[2informaticos]

Pin 2 should be 1V aprox; check R3742 and traces.

 

[Instafixx]

P3V3SSD_VMON 0V

Apologies Pin 2 is 0V.
PP3V3_S0SW_SSD is also 0V (No Shorts)

R3742 Resistance is 120k Ohms and rising.

 

[2informaticos]

Then check L3700 and R3741.

 

[Instafixx]

Both are 0V at both ends

 

[Instafixx]

There are no shorts on U3710/1 as well. But voltages are 0V

 

[2informaticos]

Check U8070 voltages.

 

[Instafixx]

Pin 1 is 3.3V
Pin 2 is 0.4V
Pin 3/4 is 3.3V
Pin 5/6 0V
Pin 7 0V

 

[2informaticos]

Solder wire bypass on R8070...

 

[Instafixx]

R8070 is a No Stuff point on the board. Ran a jumper. now i get voltages and the macbook turns on detecting the SSD. Is this the permanent solution?
Also fan spinning at max continuously but nothing heats up as such.

When LID is closed it will not go to sleep and will shut down after 1 minute.
Replaced the trackpad flex just in case.

 

[2informaticos]

Backlight and sound go off when closing the lid?
If not, check lid signal behavior.

For the fan issue, run HWMonitor and check thermal sensors.

 

[Instafixx]

LID is okay.
Backlight and Sound go off when lid is closed.

HWMonitor shows "Memory Proximity" and "HeatPipe" at 128 C