2014 macbook air, turning off randomly, now not turning on at att

[dukefawks]

I'm also suspecting crap under the SMC.

 

[peterfixit]

@louis test points look fine, none broken, a little dark but in decent condition, u6100 to all surrounding resistors is good
@duke this was repaired and ultrasonicd 6 months ago and worked perfectly since then

 

[dukefawks]

Yes, 6 months is a nice amount of time for corrosion to get conductive. No U/S treatment will remove corrosion from under BGA chips!

 

[peterfixit]

so reflow. reball, replace

 

[peterfixit]

ok a reflow of the smc means its not running again, dont know if its still going to randomly shutdown
duke, can you please tell me how you came up with the smc so i can learn from this