820-00165 SSD

[Instafixx]

SSD_PWR_EN = 3.25V
SSD_RESET_L= 3.30V
PP3V3_S0SW_SSD = 3.3V
P3V3SSD_VMON = 1V

No corossion.
No Shorts on these lines as well.

Will not detect any SSD

 

[2informaticos]

Any history available?

SSD_RESET_CONN_L, SSD_SR_EN_L?
Compare readings on U3740 with good board.

 

[Instafixx]

Diode readings are good on U3740

 

[2informaticos]

"SSD_RESET_CONN_L, SSD_SR_EN_L?"
Checked these voltage levels?

 

[Instafixx]

Yes both are 3.3V

 

[2informaticos]

Is SSD_SR_EN_L same as good board?

Check J3700 contacts.
Just in case, replace U3710/1.

 

[Instafixx]

SSD_SR_EN_L is .539 diode reading.

Replaced U3710/1.

Still its same.

 

[Instafixx]

Please let me know sir.

 

[2informaticos]

Clean J3700's contacts.
Check all its traces to adjacent components.
Just in case, bypass L3700 with a wire jumper.
Be sure none of C371x capacitors is ripped off.
Also check R3701/2.

If all good, try heating PCH.

 

[Instafixx]

R3701 is NOSTUFF.
R3702 is 8 Ohms Across Pins.
C371 caps are ok.

Bypass L3700 doesnt work.

After bypass we cannot enter the recovery mode? i am unable to enter the recovery mode to ensure whether SSD is detected - in bypass mode.

Tried heating the PCH. Still the same.

 

[2informaticos]

Boot USB macOS and check with Disk Utility.