820-4924 with green/orange light but not turning on.

[punkieftw]

Hi, i have a 820-4924 not turning on.. no water damage, no corrosion. nothing.

I think is stuck at S5 state. But I don’t know where start look why is stuck in there.

There my measures.

PPBUS_G3H @ C7900 : 12.56v
PP3V42_G3H @ C4850 : 3.42v
PPVRTC_G3H @ C1910 : 3.33v
PP5V_S5 @ C7505 : 5.05V
PP5V_S4 @ 0v
PP5V_S3 @0v
PP3V3_S5 @ C8000 : 3.33v
PP3V3_S4 @ 0v
PP3V3_S3 @ 0v
SMC_RESET_L @ R5100 : 3.36v

The board looks very well.. I dont know where start looking.

 

[dukefawks]

Green/orange light working? Using a 60W charger?

 

[punkieftw]

I try some chargers.. include the original 60w and 85w. Same result.. with any charger have green light / orange light on the charger but doesn't turns on.

 

[punkieftw]

So .. what could i do?

 

[pws6074]

I have exactly the same issue!

 

[smiba]

How is PM_SLP_S4_L doing? Anything ugly around U1900?

 

[punkieftw]

Is nothing ugly. i have some boards with the same issue. all of them are retinas non touch bar.

PM_SLP_S4_L is 0v

i dont know works the thinks with the PM_SLP_S4_L.. what i need first? where need to look? why always stuck in the S5 State? should be the PCH? i don't know !!

 

[dukefawks]

I think some 4924 boards need a good battery connected to boot.

 

[punkieftw]

I think some 4924 boards need a good battery connected to boot.

This is happening to me with several models of macbook pro retina non touchbar. not only with the 4924. i will going to proof and i let u know how im going.

 

[punkieftw]

Same result!

 

[dukefawks]

Check all rails for shorts, PPVRTC present? U1900/U1950 corrosion?

 

[punkieftw]

OK, let me see

 

[punkieftw]

PPVRTC is present, No corrosion on neither

 

[dukefawks]

No idea, could be anything. Need history, this usually does not just happen.