820-00165-A no power

[Paky46]

Hi i have this board not power no led on magsafe
where can I start?

 

[2informaticos]

Any history available?
Did you test with fake charger, or lab PSU?

Post PPBUS_G3H and 3V42_G3H voltages.

 

[Paky46]

Fake charger but work fine
it suddenly turned off
PPBUS_G3H=8.58
3V42_G3H=3.53

 

[2informaticos]

Then post these voltages with original charger too.

Do you get 3V3_S5/SUS?

 

[Paky46]

3V3_S5=3.3
PP3V3_SUS=3.3

 

[2informaticos]

Did you try known good LIO flex/board?

 

[Paky46]

ok I'll try with another flex

 

[Paky46]

another flat but same problem

 

[2informaticos]

Tried another LIO board too?
Still no amber light on Magsafe?

 

[Paky46]

I tried the Lio card on another board and on the other card the fan works, but on that one too no light but it works
on lab psu it has an absorption of 0.02

 

[2informaticos]

Then no Magsafe light is caused by LIO board.
It worked in other machine with fake, or original charger?

 

[Paky46]

ok with new Lio Board I have orange light but the fan doesn't spin and I have an absorption of 0.02

 

[2informaticos]

Do you get 3V3_S5/SUS?

 

[Paky46]

3V3_S5=3.297
PP3V3_SUS=3.328

 

[2informaticos]

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

 

[Paky46]

From 3.4 at 0.342

 

[2informaticos]

Then check for pulse at PM_SLP_S4_L (at same time).

Trying to start in SMC bypass is also worth to try.

 

[Paky46]

PM_SLP_S4_L=5V
even if pulse always remains at 5V
SMC Bypass I don't know how to do it
I found c7425 and C7400 with liquid damage. I replaced them but nothing changed
Could U7400 be the problem?

 

[2informaticos]

"PM_SLP_S4_L=5V"
Please re-check.
PCH doesn't admit 5V...

 

[Paky46]

Sorry PM_SLP_S4_L=0V