A1502 820-3467-A no power

[hgoncalves]

I'm trying to follow...

I think that's it:

PCH_INTRUDER_L = 3
PCH_SRTCRST_L = 3.3
RTC_RESET_L = 3.3
PCH_INTVRMEN = 3.2

 

[2informaticos]

All looks good.

Try to start in SMC bypass mode.
Post SMC_DCIN/PBUS_VSENSE levels.
Also check SMC_DCIN/BMON_ISENSE.

 

[hgoncalves]

SMC bypass mode didn't do anything.

SMC_DCIN = 0.03v - 15 M ohm
PBUS_VSENSE = 0v - 5.4 k ohm
BMON_ISENSE = 0.06v - 17 M ohm

 

[2informaticos]

Did you get the SMC from 3476 board?
3536 should work too.

 

[hgoncalves]

No, i get it from an 820-3536-A.
Should i replace it for another one?

 

[2informaticos]

Should work, be sure to get good solders.
You can try 3476 one, just in case.

 

[piernov]

PM_BATLOW_L?

 

[2informaticos]

Must be high, once correct charger is detected.

 

[hgoncalves]

PM_BATLOW_L is 3.3V on PS.

Can it be relate with Q5480? It burnt as well the test point. Can't the trace be lost somewhere and causing this?

 

[2informaticos]

SMC_PBUS_VSENSE is an important signal for SMC.
If incorrect, machine can only start in SMC bypass.

 

[hgoncalves]

HI, in this case, it doesn't power on in SMC bypass.

On Q5480 I don't have SMC_SENSOR_PWR_EN (0v), and on SMC_PBUS_VSENSE I also have 0V (R5488).
On R5481/2 i have 1V (0.96), and on R5488/9 I have 0V

Can I assume that the problem is on U5000?

 

[2informaticos]

The mentioned sensors are not availble in S5 state.
At least PM_SLP_SUS_L is required for DCIN_VSENSE.
PBUS_VSENSE is available only in S0 state.

Try another SMC...

 

[hgoncalves]

Hi,
Replaced SMC but same result. What else can i check?

 

[hgoncalves]

Hi,
just Replaced another SMC today, and it's the same.
No power (consumes 14mA on PSU).

PM_BATLOW_L = 3.3V
PM_SLP_SUS_L = 0.0V

 

[2informaticos]

Looks like PCH issue then...

 

[hgoncalves]

OK, thanks!