820-00239 Not recognizing SSD

[bjf]

This board had some type of oil spilled on it. The computer was pretty coated. The board had no corrosion on it but had some oil on it. I ran it through the ultrasonic cleaner and it came out working fine except it doesn't recognize the SSD. Any ideas where to look with something like this? The SSD connector is attached on J9600 and has no visible damage to it or around it.

 

[2informaticos]

Post voltages on power pins, enable and clock request of J9600.

 

[bjf]

Ssd_clkreq_l = .09v
ssd_pwr_en_l = 0v
p3v3_s5 = 3.3v
pp3v3_s5_ssd_lb = 1.8v
ssd_boot_l = 0v
storage_en = 3.3v
ssd_reset_l = 3.3v
pp5v_s4 = 5.1v

 

[2informaticos]

"p3v3_s5 = 3.3v
pp3v3_s5_ssd_lb = 1.8v"
Check J9600...

 

[bjf]

I measured the wrong pad. ssd_boot_l is actually the one at 1.8v

 

[2informaticos]

Check for continuity on J9600.
It must have the same voltages on both sides (PCH and SSD), for all signals and power lines.

 

[bjf]

Continuity is good on all pins.

 

[bjf]

I did find that the voltage drop to ground on SSD_RESET_LB_L was slightly low compared to a good board. I replaced U8601 and it's measuring normal now. 3.3V also on that line. All pins on both sides of J9600 are measuring normally. I've also checked all SSD voltages. They're fine. Nothing visibly damaged in the area although it definitely got hit by the oil or whatever it was.

 

[bjf]

I'm about to let this one go. Anyone have any other possible directions to go with this?

 

[2informaticos]

Do you get clock signal for SSD?
SSD_CLKREQ_L should be low to enable clock, of course.

 

[bjf]

SSD_CLKREQ_L is at .09V but I'm not sure where to check for a clock signal for the SSD.

 

[bjf]

Any suggestions for finding and reading the clock signal?

 

[2informaticos]

You must get 100MHz at PCIE_CLK100M_SSD_LB_P/N...