01949 Not posting (LR357)

Stopped charging. Worked on battery until battery died. Found corrosion on R3205, R3120_T, and R3208. R3208 was badly damaged so I replaced it. Connect the charger and got 20v. Put the mobo back in and reconnected everything, but then only got 5v.
 

2informaticos

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Keep the board in sthe shell, but disconnect any device.
Then connect them back, one by one.
Check each time when (if) 20V come back at USB-C input.
 

2informaticos

Administrator
Staff member
If you get Apple logo, it should also start in Target Disk mode.
It is not recognized in Disk Utility from second machine?

Can you start Internet recovery?
 

2informaticos

Administrator
Staff member
Remember, no need to pulse power button to turn it on.
In fact, phold down power button 4-5s, until turns off.
Then press and hold T key; do not press powr button again!
T2 machines automatically turns on by clicking trackpad, or pressing any key.
 
Tried with internal keyboard and external. Nothing happens when holding T key.

Powered off laptop then pressed and held power button, the laptop posts, displays logo and then shuts down.
 
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