A1502 820-4924-A no SSD

[hgoncalves]

Hi,

I have an A1502 820-4924-A that does not recognize the SSD. First, it wasen't booting the macos (freezed in the loading bar), and after the CleanME upgrade, the SSD is not recognized any more, even with a known good SSD.

On SSD connector J3700, I have 3.3V on all pins of PP3V3_S0SW_SSD_FLT

SSD_SR_EN_L = 3.2V

SSD_RESET_CONN_L = 3.4V

SSD_PWR_EN = 0V

I have 3.2V on R1620 SSD_PWR_EN , so I think that it is not the CPU (don't know if it makes sense).

I think that it might be U8070, or U3711 or U3740.

On U3740 I have 3.2V on SSD_PWR_EN , but on U3711 I think that I have 0V on SSD_PWR_EN pin 1

Shall I replace U3711?

 

[2informaticos]

"I think that I have"
What this mean, you are not sure about measurment???

If trace is broken , run a wire to fix the problem.

 

[2informaticos]

You had APFS issue, after flashing BIOS without APFS support.
I supposed that, but you've said just clean ME, not full BIOS; post accurate information in the future.
You also left unclear if SSD_PWR_EN line wasn't broken.

Now is time to clean ME of your BIOS; or flash new one (clean ME), with APFS support.
You also have the option to install High Sierra into empty internal SSD, to get APFS support with the other BIOS tried.