i'm very very sad because i've deleted the post i've created some days ago...i will try to summarize as better as i can:
820-00840, completely dead not switching to 20v
after changed 2 usb controller, 20v but no boot. all voltages present in loop. macbook like in boot loop. changed bios and smc: no luck
smc bypass only possible with port near trackpad.
tried a good battery and discovered voltages all present and stable. voltages present and unstable with power supply only.
changed isl9239 and macbook boot with battery only, pressing power button, but i have fake charging (sound, charging symbol but it can't charge)
changed another isl9239, now it boot always with power supply only. with battery connected or battery connected + power supply connected, a lot of times it doesn't boot at all (i can hear charging sound but nothing on screen, track pad not working).
and i confirm that the port near the screen, doesn't recognize usb drive at all. (blinking led doesn't appear). but it charge without problem
820-00840, completely dead not switching to 20v
after changed 2 usb controller, 20v but no boot. all voltages present in loop. macbook like in boot loop. changed bios and smc: no luck
smc bypass only possible with port near trackpad.
tried a good battery and discovered voltages all present and stable. voltages present and unstable with power supply only.
changed isl9239 and macbook boot with battery only, pressing power button, but i have fake charging (sound, charging symbol but it can't charge)
changed another isl9239, now it boot always with power supply only. with battery connected or battery connected + power supply connected, a lot of times it doesn't boot at all (i can hear charging sound but nothing on screen, track pad not working).
and i confirm that the port near the screen, doesn't recognize usb drive at all. (blinking led doesn't appear). but it charge without problem
