820-00239 Critical update issue

[2informaticos]

First of all, welcome to the forum!

Tried all mentioned by dukefawks here?

Touchbar Critical software update required

I'm just posting this here for reference as this is a common issue and there are many different causes. This is not about the network error but the error that occurred during installation of the update. The critical software update is triggered if during normal OSX boot the T1/T2 chip cannot...

boards.rossmanngroup.com

Check DFR_TOUCH_LID and DFR_TOUCH_RESET_L levels.

 

[leshuq]

First of all, welcome to the forum!

Thx

Tried all mentioned by dukefawks here?

Yep. Tried all combinations.

Check DFR_TOUCH_LID and DFR_TOUCH_RESET_L levels.

DFR_TOUCH_LID = 0.15V,
/Retried measuring, lid = 0v when board is only connected to power, booted./
SMC_LID = 3,3V
reset is 0V.
/Again, remeasured when board is laying flat on the table, reset= 1,8V, that's weird/

That is without touchbar connected at all.
_______________________________________________
Got diode readings under berkellium from actually working board, compared with mine, the same

 

[2informaticos]

SMC_LID must be high and DFR_TOUCH_LID low (0V), when lid is open.
DFR_TOUCH_RESET_L must be high.
Also be sure PMU_TO_SOC_RESET_L is high.

 

[leshuq]

SMC_LID must be high and DFR_TOUCH_LID low (0V), when lid is open.
DFR_TOUCH_RESET_L must be high.
Also be sure PMU_TO_SOC_RESET_L is high.

Well, you're right;
DFR_TOUCH_RESET seemed to be the issue.
Got it booted up on the table and flashed with TB connected.
______
It refused to flash-boot T1 without TB attached
When flashed successfully, board can boot without TB.
______
Thx y'all

 

[2informaticos]

What was the reason of incorrect DFR_TOUCH_RESET_L?

BTW, write directly into reply box, instead of clicking Reply button.
No real reason to quote an entire post, visible few centimeters above.
We try to maintain forum aesthetic, thanks.

 

[leshuq]

Well, that's surely something to dig more into, I guess.
I don't exactly figured out the real reason by now.
When board was in the housing, it was below 1,8.
Then when I took the board out again for some additional measurings, I checked it again, and it was there. You know the rest of the story.

For now I suspect pullup resistor to 1,8. There are two options that come to mind right now, either it was shorted to gnd cause it was touching some shielding below or maybe it was some solder crack or other defect, but i triple checked under microscope, and it looks fine to me.

Anyway, it's getting late, I'll continue to work on this tomorrow. Maybe I find the real reason.

 

[2informaticos]

Liquid spilled on keyboard may affects SMC_LID; check it w/ and w/ trackpad connected.
Also check HALL_SENSOR_LEFT/RIGHT, both connected; the pull-up resistor is near the sensors, not on MLB.

 

[leshuq]

But SMC_LID is high and judging by the schematic, it works fine, DFR_TOUCH_LID is 0v

 

[2informaticos]

Check hall sensor signals when board is mounted in the shell; in case touchbar doesn't work then.