Macbook Air A1466 Stuck at 480mAmp-820-00165-A

[Praveen Sahwal]

Hi

i got a macbook air 820-00165-Awhich is stucked at 480mAmp. Board looks fine. i didn't find liquid or corrosion damage on board. Even i didn't find any burnt component or loose soldering through visual inspection.
Then check some voltages and found everything normal.
From PPBUS_G3H to CPU VCORE. All 5V, 3V rails and S5 and S0 rails also. All these are present and normal.
SMC_Wake_L---3V
SMC_RESET_L--3.4V
SMC_CLK32K--1.7V
PM_SLP_S4_L---3.3V
SMC_ONOFF_L--3.4V


Could you please guide me what i am leaving behind?

 

[2informaticos]

PLT_RESET_L goes high?
Did you check for USB activity, on both ports?

 

[Praveen Sahwal]

Hi, Before it was stucked at 450mAmp but now nothing happening at all. its nit pulling any current and i noted this values.
I have no idea how to diagnose/trace PM_SLP_S4_L.

P5VS4RS3_EN -0V
PM_SLP_S4_L---0V

 

[Praveen Sahwal]

i have check all these voltages. i have gone through some other post with same problem.

PM_BATLOW_L	3.316V
PM_RSMRST_L	3.287V
RTC_RESET_L	3.313V
PCH_SRTCRST_L	3.313V
PCH_INTRUDER_L	3.023V
PCH_INTVRMEN	3.214V
PM_PWRBTN_L PULSE	3.412V

 

[2informaticos]

Post U1950 voltages.
Also check VCCST_PWRGD.

 

[Praveen Sahwal]

PP3V42_G3H- 3.42V
PM_S0_PGOOD- 0V
SMC_DELAYED_PWRD-0V
ALL_SYS_PWRGD- 0V
CPUVR_PGOOD_R-0V
SYS_PWROK_R-0V

CPU_VCCST_PWRGD-0V
PM_SLP_S3_L- 0V
PP3V3_S5- 3.3V

 

[2informaticos]

So board doesn't get now other voltage after 3V3_S5?
3V3_SUS is there at least?

 

[Praveen Sahwal]

Hi Vali, Sorry for late reply, actually i was busy with some other jobs and i put this aside.
PP5V_S4RS3---0V
PP5V_S0-0V
PP3V3_S5- 3.3V
PP3V3_S4-0V
PP3v3_SUS- 3.3V
PP3v3_S3- 0V

 

[2informaticos]

Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.
If present, check for pulse at PM_SLP_Sx_L at same time.
Be sure PM_RSMRST_L is steady high and all PCH's RTC signals present.