820-00239 intermittent ssd not detected.

[Yoel Ren]

Hi, this board came in with folder ?
disk utility doesnt show internal ssd,but sometimes laptop will boot.
i heard bad u9300, low battery will cause no ssd, but i charge it fully, still folder ?
pp1v2_ssd_hot 1.2v
pp3v3_s5_ssd 3.3v
pp3v3_2v7_nand_vcc = 2.67v
pp1v8_ssd_cold 1.8v
pp2v7_nand_pvcc and pp2v7_nand_vcc is 5v.
any pointer ?

 

[2informaticos]

Clean J9600 contacts first.
Check signals level at pins 12 & 14.

 

[Yoel Ren]

j9600 cleaned:
pin12 not stable, cycling around 2,6v to 1.3v to 0.4v,and back to 2.6v
pin 14 : cycling from 1.3v to 0.4v, back to 1.3v again.
still folder ?

 

[2informaticos]

What about pins 11 & 13?

 

[Yoel Ren]

stable 3.0v and 3.2v

 

[Yoel Ren]

another lifeboat connector doesnt help.

im making measurement with lifeboat connector off btw.

 

[2informaticos]

Wait, you've checked SSD voltages without lifeboat connected???

 

[Yoel Ren]

for the lifeboat connector voltage yeah, i dont use the lifeboat. ok i will redo measurement

 

[Yoel Ren]

11 3.08v
12 3.1v
13 90mv
14 91mv
i would sayvoltage looks good.
should i replace picolo ?

 

[2informaticos]

What about L9300/20 voltages?
Also check pins 4/6/8 of J9600.

 

[Yoel Ren]

l9300 and l9320 both at 0.9v
j6900 pin 4 1.7v
6 100mv
8 3.2v

 

[Yoel Ren]

can i swap the ssd controller, rom and etc ? in case data isnt a problem ?

 

[2informaticos]

BGA chips in SSD area are usually underfilled and the controller sandwich type.
Pretty hopeless project...