[SOLVED]820-3437 no red light

[arnonabuurs]

I have a Air 13 inch with no red light on the charger, only green. I know it means it has no feedback from Sys Onewire, but how do I go about to test it on an Air? I know how it works on a pro. Got some values:

PPBUS_G3H at F7140 - 8.17v
PP3V42_G3H at C5120 = 3.42v
PP3V42_G3H at BC_ACOK Pin 14 U7100 = 3.39v
CHGR_ACIN Pin 3 U7100 = 5.27v

How should i trouble shoot this?

 

[aprendiz]

PPBUS is a bit low, seems SMC is not working properly, check sense resistors on ISL if everything is ok my next guess is SMC.....

 

[dukefawks]

PPBUS is too low so SMC is not running. SMC_RESET high? Corrosion under/around SMC?

 

[arnonabuurs]

There was indeed some corrosion, we have replaced C5008 it looked like one drop on that IC but indeed might have leaked under the SMC, SMC_RESET_L = 3.417v and R7100 = 0 ohm

 

[arnonabuurs]

Update: after an SMC reflow we got an orange light but next missing PP5V_S4RS3 but we do have 3.3v

 

[dukefawks]

The usual, check for a pulse after connecting power on PP5V_S4RS3. Is it power cycling? Check resistors/traces around U6100, could still be more crap under SMC.

 

[larossmann]

Are you getting PM_DSW_PWRGD after the smc reflow?

 

[arnonabuurs]

Replaced the SMC completely and now it works thanks!

 

[arnonabuurs]

In answer to lewis, no but after replace it yes