Re: MacBook Air 820-3435 no power?

I've checked 3v3 rails, all showing the following:
PP3V3_S5 5k Ohm
PP3V3_S4 1.4m Ohm
PP3V3_SUS 26k Ohm
PP3V3_S3 1.1m Ohm
PP3V3_S0 1.1k Ohm
PP3V3_S4SW_SNS 1.1m Ohm
PP3V3_S0SW_SSD 202k Ohm
PP3V3_S4_TBTAPWR 500+k Ohm

I believe these are all good, PM_SLP_S4 is going high briefly and pulsing the same as MP_G2_EN.

Thank you for the link, it confirms my thoughts about u5701. I have some new TPS51980A's on the way, and I'll clean up the SMC.

I'll...

Re: MacBook Air 820-3435 no power?

Check the resistance to ground @U7501, pin # 29:

1.2m Ohm on pin 29.

Good Evening,

I come to you in a time of great need, I am looking for some help with diagnosing this 820-3435 MacBook Air.

It has suffered some liquid damage but the board was cleaned before I got my hands on it, so I can't see anything too obvious.

There is a faint green light on the charger, I've been taking this as no light. I'm using a genuine 85W magsafe. Replacement DC in board on the way.

Some voltages:
PPBUS_G3H 8.6v
PPBUS_S5_HS_COMPUTING_ISNS 8.6v
PP3V42_G3H 3.42v
PP5V_S5 3.8-5v (pulse)
PP5V_S4RS3...

Re: New Members - please post your introductions here

Hello,

My business here is to gain a greater understanding of component level repair.

Thank you all in advance!

Jack.