820-3536 Dimm green Light SMC?

Bouba148

New member
Hi Team,

820-3536A with Dimm Green Light

Corrosion over the J8300 Display Connector + J6100 spi connector: cleanned: NOK

PPBUS_G3H: 12.29V
PP3V42_G3H: 3.438V
PPVRTC_G3H: 3.436V
PP5V_S5: 0V
PP3V3_S5: 0.44V
SMC_BC_ACOK: 3.405V
SMC_ONOFF_L: firstt time i read it it was 1.805V or 3.435V with full fan speed if I put the probe on it. If I put the probe first and then plug the charger then it's 1.777V
PM_BATLOW_L: 0.374V
SMC_ADAPTER_EN: 0V
PM_PWRBTN_L:0.032V

SMC re heat at 100 degrees still the same

At U1900 pin 12: 32Khz OK always there
At Y1905: 25Mhz OK but only when the Fan spin
At Y5110: 12Mhz OK alway there.
 

2informaticos

Administrator
Staff member
"PP5V_S5: 0V
PP3V3_S5: 0.44V"
The board cannot even try to start in such conditions.
If fan spins, these values are incorrect...

Disconnect LIO flex, let only 5pins DC cable connected.
The board should start by itself when charger is plugged in.

"PPBUS_G3H: 12.29V"
SMC and charger IC don't "talk".

Start checking SMC_RESET_L and also need to get stable 3V at SMC_ONOFF_L signal.
Disconnect keyboard and any other peripherals...
 

Bouba148

New member
Hi John, Ola 2Informaticos

SMC_RESET_L: 3.403V
PP3V3_S5_AVREF_SMC :3.299V
PP3V3_S5: 0.341V SORRY

U7100: resistance 17/18: 3.6 Ohms 27/28: 20.3 Ohms

@2Informaticos: The board Only Starts (10 sec fan spins 2-3 sec stop in loop) only when I put the probe or the twizer on the SMC_ONOFF_L test point or at R5170.

Now after few hours of rest :

I have a solid Orange light ( No green ) it goes directly to Orange.
Also when at one moment I had PPBUS at 12.56V instead of 12.29V.......now it's back to 12.29V but still have the solid orange ithout passing by green light.

All my tests from the begining are done without LIO board only with the magesafe board and Fan connected.
 
Last edited:

Bouba148

New member
SMC_MANUAL_RST_L: 2.788V faulty U5110?
SMC_ONOFF_L: around 1.5V when I short to gnd or put the probe on it I can see it jumping to 3.435V

When I have the Orange light + normal fan speed (in 10sec loop) then PPBUS is 12.59V
 

Bouba148

New member
Hi
I took out R5170, mesured it and this one is OK.
Because when it's in place it's mesureing almost 3kOhms.
I'm warming up the UC to pass the board in it before reballing the SMC.....
 

Bouba148

New member
Back from the Utra Sonic Bath:

Now I Have a solid 12.59V for PPBUS and charger light going normally from green to orange light.

The boar is not entering into S4 State now:
After UltraSonic Bath

PPBUS_G3H: 12.59V
PP3V42_G3H: 3.436V
PPVRTC_G3H: 3.339V
PP5V_S5: 5.031V OK
PP3V3_S5: 3.339V OK

SMC_BC_ACOK: 3.400V
SMC_ONOFF_L: 3.433V
PM_BATLOW_L: 3.328V

SMC_ADAPTER_EN: 3.403V
PP5V_S4: 0V
PP3V3_S4: 0V


at U7501:

Pin 12 SMC_PM_G2_EN: 3.428V which enables PP5V_S5
Pin 4 P5VS4RS3_EN:0V
Pin 21 S5_PWR_EN: 3.433V

PM_SLP_S4_L: 0V
ALL_SYS_PWRGD: 0V

When shorting SMC_ONOFF_L to gnd no sign of life.

At U1900 pin 12: 32Khz OK always there
At Y1905: nothing
At Y5110: nothing.
 

2informaticos

Administrator
Staff member
You had oscillation at Y1905/5110 before...
Check traces and REBALL SMC.

Don't forget to check RTC signals.
Do you get PM_SLP_SUS_L and 3V3_SUS voltage?
 

Bouba148

New member
Hi, Ola 2Informaticos,

I think we can close this topic and mark it as closed.
I can't really explain what happened but now everything works fine and the machine turns on correctly.
I'm suspecting my old 85W official charger: this one now turns green - orange - off in loop. :mad:

I used another one and everything worked fine now.

Muchas gracias mi amigo.
Thanks to all the team ;)
 
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