820-00239 - internal storage not detected - Pristine board

[overshoot]

As the title says it, internal storage is not detected.
Both in macOS using another disk or using the data recovery tool which can be plugged to the J9600 connector.

Logicboard is spotless.

I did some diode mode measurement on J9600 and they all compare similarly with a know working board and with the measurements found on Shiny computers' Wiki.
It's a little bit off on some lines but there are no shorts.

TPAD_SPI_INT_CONN_L on the trackpad connector (J4501) however measures .65 instead of .47 which seems quite a big difference.
TPAD_SPI_INT_L is measuring the same resistance to ground and connects directly to the CPU through U4531.

Would could prevent the data recovery tool from accessing the internal drive other than the SSD controller on some NAND chips in your opinion?

 

[2informaticos]

Did you fix in place the metal plate of J9600, when test the board in normal mode?
Do you get all SSD related voltages?

 

[overshoot]

Yes the lifeboat connector was plugged in.
SSD voltages seem to be present but there are so many that I can't be sure I am not missing one.
1.2, 1.8, cold, hot, etc...

Is there a list of them?

 

[2informaticos]

You should check all SSD voltages which can be generated from J9600 power rails.
The reason is that these voltages must be also generated when you connect the recovery tool.

 

[overshoot]

I just checked and I am getting them all.

I took some measurements on the test points next to C9409.
Please let me know if you see any measurement off or if there is anything else I can try before giving up on this one.
What a waste... such a nice board with high specs.
Nothing is getting hot other than the CPU when on (normal temp) so I don't suspect any short.
NANDs and controller are staying 30-37 degrees C so pretty cool.

PP1V8_SSD_COLD​	1.8​
STORAGE_LB_EN​	3.3​
SSD_RESET_LB_L​	3.3​
SSD_DBG_UART_R2D​	3.3​
PP0V9_SSD_REG​	0.84​
SSD_PWR_EN_LB_L​	0​
LPSR_EN_LB_L​	3.3​
SSD_DBG_UART_D2R​	3.3​
SSD_BOOT_LB_L​	1.8​
NAND_ZQ_U9100​	0​
S3X_JTAG_TRST_L​	0​
S3X_JTAG_TDO​	0.9​
S3X_JTAG_SEL​	0​
S3X_JTAG_TCK​	1.8​
S3X_JTAG_TMS​	1.8​
S3X_JTAG_TDI​	1.8​
TP_SMC_DEV_SUPPLY_L​	3.4​
SMC_ONOFF_L​	3.4​
SMC_RESET_L​	3.4​

 

[2informaticos]

You should compare with working board.

If all voltages are OK, the should be communication problem between SSD chips...