820-00165-A - liquid yaourt damage - charge - Turn on, Chemie restart, no screen.

[samstown]

Hi,

I got this A1466, got drops of milk, was sill working for month and now stopped. I can see trace of yaourt neard LCD connector, on diode, bigcoil and the two caps.
When connected to power, magsafe get green, then orange, fan start to spin for 3 seconds, I hear Chemie... and reboot, same again and again.

I can't measure any voltage on those caps and coil.


Thanks
Sam

 

[2informaticos]

Post diode mode to ground on both pins of D7701; w/ and w/o LCD connected.
Be sure F7700 is good.
Don't forget to check XW7720 and inspect U7701 for corrosion.

 

[samstown]

Thanks.
F7700 is good.
without LCD
D7701 Diode mode to ground.
Pin1 =.389
Pin2 =.604

with LCD (almost same)
Pin1 =.388
Pin2 =.604

XW7720 is a bridge or that's just a piece of copper, I don't get what component is it (pics attached.. there no component)

pics of U7701, it looks ok to me.

 

[2informaticos]

We have a sticky post about Air backlight problems.
Also many threads on the forum.

xw7720 fix.jpg

drive.google.com