820-00850 pp3v3 short 5v on chrager ppbus 0v

[yair37]

i was just replace the screen, after connect everything it was work, the i was close all the screen screws and the boom 5v on charger!
820-00850 pp3v3 short 5v on charger ppbus 0v.
what could happened????

 

[yair37]

i suspect u3200 but how it can happend?

 

[yair37]

i was replace u3200 and ub400 now the is no short on pp3v3 but sill no V on pp3v3 and no ppbus

 

[2informaticos]

PPBUS_G3H is main power rail for T2 machines.
You cannot get any other voltage, if no PPBUS_G3H present.

Do you get voltage at R7020?

 

[yair37]

ppdcin_3gh 0v stable
ppdcin_3gh_chgr 5.3v -0v every 10s pulsing
chgr_csi_r_p 5.3v -0v every 10s pulsing
chgr_r_n 5.3v -0v every 10s pulsing

 

[yair37]

UPDATE:
i was reball again u3200 and ub400 now - ppbus 12.5v and pp3v3 3.4v

pp20v_usbc 5.2v

charger 5A 0.35A

 

[2informaticos]

5V steady on USB-C meter now?
Doesn't pulse at 5s?

Do you get all SLPS2R and AWAKE voltages?

 

[yair37]

5V steady on USB-C meter now?

yes steady.

AWAKE voltages?

?

Do you get all SLPS2R

yes i have all V

 

[2informaticos]

Some power rails have SLPS2R, or AWAKE in their names.
What do you think I was asking you to search???

 

[yair37]

Lines that have the mac awake voltage..

 

[2informaticos]

If ALL SLPS2R and AWAKE voltages are present, try to put the machine in DFU mode.

 

[yair37]

pp1v8_ AWAKE 1.1v
all the rest 0.8v

 

[yair37]

u6940 look burn....there is PP3V3_G3H_RTC but no CHGR_RST_IN_R, CHGR_RST_IN and UPC_PMU_RESET.
there is any other board model thet i can take from?

 

[2informaticos]

Do not touch U6940, it is good.
Why would you want enabled reset signal???

 

[yair37]

From other post with the same problem:
"Let me be more specific; looks like you didn't understand me.
Poste exact (two decimals) voltage for CHGR_RST_IN_R, CHGR_RST_IN and UPC_PMU_RESET.
We need to see which side of output resistors is pulled down.
If all are 0.0V, or CHGR_RST_IN_R is the lowest, then change U6940"

 

[yair37]

Sorry if i mixed....but look like the same problem.
I didnt take it out but i think there is small "burn hole" on it. So...

 

[2informaticos]

You didn't read entire thread.
I did the same mistake at the beginning, comparing the signal with SMC_RESET_L.
Note that NO "_L" in these names now; ALL must be 0V.

 

[yair37]

o.k so lets go roll back...

pp1v8_ AWAKE 0v
PPVDDCPU_AWAKE 0.8V
PPVDDCPUAWAKE_SW0/2/3 - 0.8V
PP1V2_AWAKE - 1.2V

ABOUT THE U6940

PP3V3_G3H_RTC 3.3V
CHGR_RST_IN_R/L 0.8V
PMU_ONOFF_L 3.2V

CHARGER WITOUT BATTERY 5.2V 0.25A STABLE.

 

[2informaticos]

PP1V8_AWAKE must be present too.
Check diode mode there.

BTW, you've posted 1.1V on a previous post...

 

[yair37]

just sew..its pulsing