820-00840 no boot!! A BIG MISTERY

[phantomEVO]

how can i boot from the internet if the notebook is totally dead???? it doesn't respond to any key unless i boot in smc bypass...like i have already said, if i push the power button, nothing happen

like i said before.....


and....yes, i've already tried another bios

[phantomEVO]

now i'm trying to install macos on a usb, and see if, removing the original ssd, in smc bypass it can booot the usb

[mon2]

What was the result of the shorting the on/off button pads on the logic board? (post #36)

[mon2]

A lot of ideas were shared but not followed. You have many parts of this unit working.

[phantomEVO]

What was the result of the shorting the on/off button pads on the logic board? (post #36)

i couldn't try because of dead battery.

now i have installed a good battery and discovered something.

if i insert the cable, the fan start after some second and spins for 10/15 second. and i can clearly hear chargin sound.

with battery installed, i can't go in smc bypass.

with good battery and charger connected AT THE SAME TIME, ALL VOLTAGES ARE STABLE!


trackpad doesn't click and i have no caps lock led

i've tried to power it on with battery only pushing power button or make a jumper between smc_onoff_r_l and gnd with no luck

[phantomEVO]

changed isl9239! now macbook can boot with battery only pressing power button, but i have fake charging (sound, charging symbol but it can't charge)




can't boot anymore with power supply only

ppbus_g3h is 0v when only power supply is connected

[mon2]

What chips are used by the power adapter?

Review them for defects.

[phantomEVO]

ok fixed with another isl9239...now it charge with both ports

but i still have some problems.

some times (not always) macbook doesn't start with battery only, if i connect the power supply too, i have charging sound, fans spins some seconds then stop ad nothing happen.

with cable only, it boots always.

other problems:

one port charge but not read usb drive (status led of usb doesn't blink at all). this port is near the screen....maybe it's beause of that, that i can boot since the beginning, with one port only! (the port near the trackpad)

another problem is this

[phantomEVO]

ok, changing u3200 now i can read usb drive.


i have a lot of problem to use external monitor throug usb c adapter...but it is not a foundamental problem at the moment.

i don't understand why i cant boot with battery only or power supply + battery...i will tra another battery flat...just in case...

and i have also a big column darker then the rest of the screen

[phantomEVO]

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