Macbook Air 820-00165-A Ornage light not turn on.

[Dewanbd]

HI,
This MB looks very good , no sign of water damaged. Green/ orange light but not turn on
S5_PWRGD: 0v
DSW_PWRGD: 3.4V
PM_RSMRST_L: 3.2v
ADAPTER_EN: 3.4V


ppvcc_s0_cpu 0v
ALL_SYS_PWRGD 0v
SYSCLK_CLK25M_X1 .6v
SYSCLK_CLK25M_X2_R 0v
U1900 pin 12: 0v
Pin 1: 3.3V
Pin 5: 3.3V
Pin12: .45V
Pin 13: 3.4V

Also:
Pin 3: 0V
Pin 4: .4V

Any help please.

 

[2informaticos]

"S5_PWRGD: 0v
DSW_PWRGD: 3.4V"
Are you really sure???
Check the note on page 59.
PM_DSW_PWRGD requires S5_PWRGD presence...

"U1900 pin 12: 0v
-------------
Pin12: .45V"
Second value looks correct, but when we can trust you?

Post PM_BATLOW_L and 3V3_S5/SUS.
Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.
If yes, check for pulse at PM_SLP_Sx_L signals.
Check al (4) RTC signals.
Did you try SMC bypass?

 

[Dewanbd]

S5_PWRGD: 3.4v
DSW_PWRGD: 3.4V"
Pin12: .45V" ( right one)
PM_BATLOW_L 3.3v
3V3_S5 3.3v
Trigger SMC_ONOFF_L, drop pulse at PM_PWRBTN_L=0.36v
pulse at PM_SLP_Sx_L couldnt find on B.view.
Dont know how to check RTC signal.
SMC bypass no luck.

 

[2informaticos]

"PM_SLP_Sx_L couldnt find on B.view"
x=0, 3, 4 at a time...

"and 3V3_S5/SUS"
Post both voltages please.

"Check al (4) RTC signals
----------------------
Dont know how to check RTC signal"
Look at page 12...

 

[Dewanbd]

Trigger SMC_ONOFF_L, drop pulse at PM_PWRBTN_L=0.36v
pulse at a time
PM_SLP_S0_L =0v
PM_SLP_S3_L=0v
PM_SLP_S4_L= 0v

3V3_SUS=3.3v

PCH_INTRUDER_L : 3.3
PCH_INTVRMEN: 3.0
PCH_SRTCRST_L:3.3
RTC_RESET_L:3.3
PPVRTC_G3H=0v

 

[2informaticos]

"PPVRTC_G3H=0v"
Do you have short there?
Check U1900 area; usually corroded C1910...

 

[Dewanbd]

My BV shows PPVRTC_G3H should be 6.3 but actualy got 3.3, the first one 0 V was wrong. This board looks very clean overall.

 

[2informaticos]

PM_RSMRST_L good?
If OK, then looks like PCH issue.
You can try heating it to 180-200 degrees using quality flux.
Any history available?

 

[Dewanbd]

PM_RSMRST_L 3.3v, heating it to 180-200 degrees using quality flux no luck. SCRAP!!

 

[2informaticos]

Could still be SMC which blocks PCH reaction.
Is the last thing you can try before trash the board.
I remember someone reported to solved same behaviour changing it...