820-02100 20V 0.15A bootloop (DFU error 21)

[ajdoc]

Cant find corrosion on the board.
At the begging i noticed there Aplle logo on the screen for 2-3 seconds and it is bootlooping.
There was no backlight.

When the screen is connected then UP730 was getting hot (there is no short around and I think internal display is faulty thats why UP730 is hot and there is no backlight).

Customer needs data so I disconnected internal display, connected HDMI monitor but nothin.
Tried to enter logic password (in case there is login screen) and found even Capslock is not working.

I manage to enter DFU once and did 'revive' but got error 21.
I cant enter DFU again.

Any idea?

 

[2informaticos]

Use external switch method for DFU access.

DFU Mode Restore (Macs) - LogiWiki

We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area

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Any chance to stay on in recovery menu?

 

[ajdoc]

No luck. Wont go to DFU - tried option with PMU_ONOFF_L.

 

[2informaticos]

"tried option with PMU_ONOFF_L"
I don't know what this mean.

You must use a switch over SV100/10 pads.
Be sure RV120 is soldered!
Another switch over SV101/11 can help, discarding an issue with power button.