A1708 820-00840 won't turn on after battery replacement

[sdogs]

this macbook had had liquid damage, i replaced trackpad connector, i also changed efi chip, battery was dead and put in a new one. Today I connected the battery without fixing with double sided tape, I switched it on and everything went smoothly. Before turning off I deactivated autoboot with a command from the terminal. I turned off, I unplugged the battery, I reconnected everything and now it does not turn on anymore. When I connect the charger it has a normal current draw and 20v, the symbol of the charged battery appears for a moment and then nothing, dead. It does the same thing if I close and reopen the lid, for a moment just the battery symbol.
What can I do? all this is very strange .....

[mon2]

Re: A1708 820-00840 won't turn on after battery replacement

D6950 - measure the voltage on this component.

Post the readings of pin #1 to ground; pin # 2 to ground.

[sdogs]

Re: A1708 820-00840 won't turn on after battery replacement

Pin 1 0,40 - 3,4 v
Pin 2 0,40 - 3,4 v

[sdogs]

Re: A1708 820-00840 won't turn on after battery replacement

solved, I bought a bios chip already programmed, it worked for a day, I got one from another logic board and now everything works !!
I don't know if the terminal command "sudo nvram AutoBoot =% 00"
may have created some problem with the bios chip.

[reformatt]

Re: A1708 820-00840 won't turn on after battery replacement

With Intel machines, you can't swap a EFI chip without first cleaning the ME region. Dirrty ME usually results in a slow boot, weird fan speeds etc.

[sdogs]

Re: A1708 820-00840 won't turn on after battery replacement

thanks for the information, I don't have a chip programmer, I would like to buy one, even for newer macbooks, which programmer do you suggest?
At the moment the macbook seems to be doing very well, very fast start-up, fans under control, perfect battery !!