820-4924 NO SSD

[Kyle93]

No liquid or drop damage. SSD just randomly stopped being detected. Tried known good ssd.

Replaced C3710-17 no change.

U3740 pin 6 3.2V pin 7 0.380v pin 8 0V pin 3 3.2V pin 4 3.4v

What should be checked next?

 

[2informaticos]

Do you get 100MHz PCIE clock for SSD?
SSD is not recognized at all in Disk Utility?

Check U3710/11 and their traces.

 

[Kyle93]

not sure about 100MHz PCIE clock for SSD, do not have a oscilloscope.

SSD not recognized at all in disk utility.

Changed U3710/11 but no change. Traces are fine

 

[2informaticos]

Compare voltage readings on SSD connector lines with another board, using similar kind of SSD.

 

[Kyle93]

PCIE_SSD_R2D .338v on bad board and 0.515v on good board. Bad CPU since C3710-17 are already replaced???

 

[2informaticos]

What is SSD_CLKREQ_L level on bad and good board?
Of course, check with SSD inserted.