820-00165 No Power with Orange Light

[Korai]

Hi there

First of all thank you louis for your informative videos I have learned alot from them and still learning so thank you.

Today I got Macbook Air A1466 820-00165 no power with orange light on charger, after diagnosing only component was corroded was C7750 but not short to ground but still have removed and replaced with new one but it is still no power, there is spiking power on PP5v_s4rs3 not constant on.

I would really appreciate your quick response and help.

Thank you in advance.

 

[2informaticos]

First of all, welcome to the forum!

At the time you get the pulse at L7520, check on other big coils too.
Also check for pulse at ALL_SYS_PWRGD.
Remove U1950 and inspect for corrosion under it.
Also test SMC bypass mode.

 

[Korai]

Thank you for your reply

I am not getting pulse on L7520 now,
nothing on ALL_SYS_PWRGD.
No corrosion under U1950
tried SMC bypass didnt work either.
3.3v on L7560
8.6v on L7130

what is next to check ?

 

[2informaticos]

Do you get 3V3_SUS?

 

[Korai]

yes I am getting 3V3_SUS

 

[2informaticos]

Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L (at same time).