820-00840 black screen w/backlight for 10sec ish then turn off

Alan.L

Member
board turns on, it shows the battery logo once before but mostly shows a black screen with a blacklight on for 10sec then turn off and repeat.
same on an external monitor. no USB activity, no chime. CPU gets warm.
I've already tried two efi clean ME Region ROMs from you here @2informaticos and does the same thing.
smc bypass doesn't work, the trackpad does click and the fan does spin.

CPU 0.7v
20V, 61mA then constant 28mA showing on USB-C meter.
 

2informaticos

Administrator
Staff member
The board stays on after backlight disappear?
Did you try the board alone on the desk?
Monitor USB activity and external video then.

Same behavior with both, charger and battery connected?
 

Alan.L

Member
CPU goes to 0v after the backlight disappeared. USB light doesn't blink, external monitor turns on for 10sec then switch off.
USB-c stays at 20v but 0ma after the backlight disappeared.

board alone of the desk:
CPU 0.7v
20V, 61mA then constant 28mA showing on USB-C meter.


board on the case with screen w/o battery:
CPU 0.7v
20V, 61mA then constant 53mA showing on USB-C meter.
 

2informaticos

Administrator
Staff member
"board on the case with screen w/o battery"
Still the same w/ battery?

Try to start in safe mode and boot menu, if possible.
Try also Target Disk mode; with another Mac connected to it.
 

Alan.L

Member
"Still the same w/ battery?"
yes.

"Try to start in safe mode and boot menu, if possible.
Try also Target Disk mode; with another Mac connected to it. "

both don't work. no key is working at all. I'm using a test housing, keyboard and trackpad work fine on my other boards.
 
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