Diagnosis For Loss of Power Input on A1370

Salutations fellow fixers,

I am new to the repair game, but confident in my technique and ability, but weak in experience.

I am repairing a friend's 11" 2010 C2Duo MacBook Air.

This machine used to power on all the time, and the battery is fine; it was at 380 full cycles and worked perfectly.

It has been subject to water damage in the past, but appears to have a functioning logic board.

From the time he showed it to me until now, the charging was spotty and the MagSafe connector had to be unplugged and replugged several times before the light came on and the battery charged. The MagSafe brick works well on another machine.

Recently, the machine has completely stopped charging, as well as turning on.

My questions to the professionals are:

-Where/how is the MagSafe port connected to the rest of the machine?

-Does power move from the port to through the logic board and to the battery?

-If so, which connection is likely broken, the port to board, or battery to board?

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- Where/how is the MagSafe port connected to the rest of the machine?

It is on the right side of the board if you flip the MacBook air upside down.

- If so, which connection is likely broken, the port to board, or battery to board?

Honestly it's probably a chip or a few other components on the charging circuit that has gone bad.

Does the MagSafe charger show any lights right now? This info is important as it can tell you what could be at fault.

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The MagSafe charger doesn't show any lights when connected to this machine, though it lights up and charges other machines. I will look around the MagSafe board with more detail. Maybe just a little corrosion?

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Alright! its been a while. I have opened the machine up and taken the charging/IO board out. I found some corrosion near the power input. Got some isopropyl alcohol on a q-tip, rubbed it for a minute and? Good as new! I was amazed and surprised that it was that easy, but this is the second time alcohol has saved my butt. Thanks so much for your help in pointing me in the right direction @benjamen50

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Tim will be eternally grateful.
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