A1990 820-01041 - Stuck at DFU, error code 6 on restore

[it-solve]

Data Recovery case, so cannot use DFU Restore

No liquid damage, usual oxidation around C9081 from fluff and humidity.
Inspected the board inch by inch no other oxidation or liquid.

Only option i see is DFu Revive, but fails with code 6 when waiting to transition to Restore.
Any suggestions?

 

[2informaticos]

Humidity on SSD power supply area is not good.

Did you try DFU revive with charged battery and trackpad connected?
Checked all secondary power supplies?

 

[it-solve]

Do we know the power sequence of Apple silicon ? I cant find it on the schematics anymore.
Unsure which ones are the secondary lines.

With plain board on the desk - 20V / 0.07A - - connected to top left port

PPVCC_S0_CPU - 0V
PP1V2_S3 - 0V
PP1V2_S0SW - 0V
PP0V6_S0_DDRVTT - 0V
PP2V5_S3 - 0V
PP1V05_PRIM - 0V
PP1V05_S3 - 0V
PP1V05_S0SW - 0V


Aliases 2
PP1V8_G3S - 1.8V
PP5V_G3S - 5.1V
PP3V3_G3H_T - 3.36V
PP3V3_G3H_RTC_X - 3.38V
PP3V3_S0SW_TBT_X - 0V
PP3V3_S0SW_TBT_T - 0V
PP3V3_G3SSW_SNS - 0V
PP3V3_G3H_SSD0_SNS - 3.3V
PP3V3_G3S_WLAN - 0V


PBUS_G3H - 12.2V
USBC_XA_CC1_CONN/CC2_CONN and USBC_XA_CC1/2 - Fluctuates - 0.8-1.7V
same for *XB* when connected to the bottom port, is this a default behavior?




Under IR cam only SSD voltage regulator and SMC warms up

 

[2informaticos]

Short 3V3_S5 to ground and test again DFU revive.

 

[it-solve]

Jumpered it to GND and did revive with bare board on desk, it fails with code 6 and just shows as Apple Controller - in Restore mode after it fails. Any ideas?

 

[2informaticos]

Try with trackpad and battery connected.
If still fails, SSD itself may be the culprit.

 

[it-solve]

Assembled in the chassis, same error message. With both all connected as well as only tpad and battery

The operation couldn’t be completed. (AMRestoreErrorDomain error 6 - Failed to handle message type StatusMsg (Operation failed)) [AMRestoreErrorDomain – 0x6 (6)]

Error logs doesnt seems to be useful