A 1707 820-00281

[ipetro]

Hello. I can't install the system.
Reset PRAM , SMC NOT HELP

 

[2informaticos]

Maybe touchbar problem.
Test disconnecting it.

 

[ipetro]

I tried to turn everything off one by one, and even turned off the display and connected an external one, even moving it to another case the problem remains. I tried internet recovery from the old to the latest axis but the problem remains.

 

[ipetro]

This has the same problem as 1706. Any advice on how to fix it?
https://logi.wiki/index.php/Critical_Update_Required_Troubleshooting
The guesses from this article don't work.

 

[ipetro]

I changed another case from a working MacBook and when I try to install the latest version I get this error

 

[2informaticos]

Try to install from USB...

 

[ipetro]

the system is installed but turns on only in safe mode. in normal mode it cannot pass the critical updates window

 

[2informaticos]

Any history available?
Did someone work before on the board?

 

[ipetro]

The MacBook came in for repair because it stopped turning on. After examination, I discovered that the capacitor C3501 exploded. After replacing it, the MacBook turned on in recovery. The system was installed but got stuck on critical updates. And I still don’t understand what exactly is preventing the updates from being installed (downloading is only possible in safe mode)...

 

[2informaticos]

Check J4401/2 voltages, with touchbar connected.

 

[ipetro]

I noticed that it takes him a very long time to wake up from sleep (about 30-40 seconds)

 

[ipetro]

J4401
PP3V3_S0SW_DFR=3.3V
PP1V8_S0SW_DF=1.8V

J4402
PP5V_S0_T139=5V
PP1V8_S0SW_DF=1.8V

 

[2informaticos]

Also check pins 10 & 12 of J4401 and 1, 2 & 18 of J4402.

 

[ipetro]

J4401
DFR_DISP_INT=0,080v
DFR_DISP_RESET_L=0v

J4402
DFR_TOUCH_PANEL_DETECT=0.230v
DFR_TOUCH_LID=1.8V
DFR_TOUCH_RESET_L=1.8v

 

[2informaticos]

"DFR_DISP_RESET_L=0v"
This must be high too.

 

[ipetro]

and who generates it?

 

[2informaticos]

It is pulled-high by R4481, but is controlled by T1.

Check DFR_TOUCH_LID level too.
Compare with working board.

 

[ipetro]

DFR_TOUCH_LID= 0v
R4481=1,8в
Replace T1?

 

[2informaticos]

Did you check if R4481 has correct ohm value?

You may have knocked off component, damaged connectors, broken trace...