820-3209-A dead

[Yoel Ren]

no visible water dmg / corrosion
ppbus 12.4v
pp5v_s0 5v
pp3v3_s0 2.9v ??
pp1v8_s0 : 1.2v ??
pp1v05 : 1.05v
pp5v_s3 : 5v
all_sys_pwrgd : 0v
there's a bit of high pitched noise around u1800 or its back near smc, i couldnt pin point the exact noise
I have tried replacing u2700, u7770 and u7780..
I tried replacing component where the various pulled down rail gather, but still dead
any advice ?

 

[2informaticos]

"all_sys_pwrgd : 0v"
Remove first Q7950.
If still low, start removing R7963/4/5/6 and R7901, one by one.
Keep in place R7967.

 

[Yoel Ren]

r7966 pulled and fan spin, all_sys_pwrgd 2.6v, VCORE 1.1v, but still no usb activity, fan start to spin fast after a while, pch doesnt feel warm enough to indicate that its working
should i placed back resistor r7963-5 ?

 

[2informaticos]

Solder back the other resistor and keep out R7966 (for the moment).
Do you get 1.8V at L7720?

 

[Yoel Ren]

okay, i can't put back rr7964, 63 and 66, or i will lose fan spin..
1v at l7720.. should be 1.8v..

 

[Yoel Ren]

I remeasure my power rail
pp5v_s0 : 5v
pp3v3_s0 : 2.5v
pp1v05_s0 : 1.05v
pp1v5_s0 : 0.9v
pp1v8_s0 : 0.9v

 

[2informaticos]

ALL_SYS_PWRGD is pulled down because you have problems on some power rails.
You must fix these problems to continue.

Both 1V5_S0 and 1V8_S0 come from 3V3_S0, which has incorrect level.
First check diode mode to ground on this line.
And post voltages for Q7812/30.

 

[Yoel Ren]

diode mode :
1v5_s0 : 0.335
1v8_s0 : 0.366
3v3_s0 : 0.278
q7812 : pin 1 : 0
2 : 3.3v
3 : 0
4 : 0
5 : 0
6 : 3.3v
q7830 :
1 : 2.5v is this bad ?
3 : 3.2v
4 : 3.3v

 

[2informaticos]

You should change Q7823.
I cannot understand how can you get the same voltage at pins 2/6 and 5/3 of Q7812...

 

[Yoel Ren]

q7823 ? i changed q7812 and q7822 both, but now macbook doesnt have fan spin at all, even tho i changed both again.
i checked, I have pp5v_s5 5v
pp3v3_s5 : 3.3v
no pm_slp_s4_l , so i checked
ppvrtc : 3.3v

1. PPVRTC_G3H		3.3v
2. RTC_RESET_L		3.3v
3. PCH_SRTCRST_L		3.3v
4. PCH_INTVRMEN_L		2.2v
5. PCH_DSWVRMEN_L		2.49v
6. SYSCLK_CLK32K_RTCX1		i don have scope..
7. PP3V3_S5		3.3v
8. PM_DSW_PWRGD		0v
9. PP3V3_SUS		0v, I have tried reball smc
10. PM_BATLOW_L		0v, no short

 

[2informaticos]

I meant Q7830, sorry.
Fix PM_BATLOW_L and PM_DSW_PWRGD; check S5_PWRGD.

Check your work and be sure to use original 45/60W Magsafe 2 charger.

 

[Yoel Ren]

i have changed q7830 too
i have changed smc, but still doesnt have pm_batlow_l , because i don have pp3v3_sus.. smc_batlow_l is 2.9v
s5_pwrgd 3v
pm_dsw_pwrgd : 3.4v

 

[2informaticos]

Post again Q7812/30 voltages.

 

[Yoel Ren]

q7812 : no voltage at any pin, but no short.
q7830 : pin 1 : 0v
pin 3 : 3.3v
pin 4 :3.3v

 

[2informaticos]

Something went wrong with SMC reballing, or other thing.
You've lost the voltages mentioned on first post.
So check and re-check your work...

 

[Yoel Ren]

owh sorry, there's a mistake probing
q7812 pin 3 and 6 is 3.3v, else is 0v
im absolutely sure in my smc reballing tho..

 

[2informaticos]

If S5_PWRGD is high and still no PM_DSW_PWRGD, you have SMC problem; note on page 62.
Be sure R5092 is good.
You may need to replace SMC...

 

[Yoel Ren]

i say i have pm_dsw_pwrgd at above msg..
r5092 guud 100k

 

[2informaticos]

Ooops, I missed that sorry.

You had S3, even S0 voltages.
Something happened in the process repair, if you lost all them.
If only you worked on the board since then, re-check your job.

PM_BATLOW_L is pulled up inside PCH.
SMC can only pull it down, via SMC_BATLOW_L; and is not the case now.
Probably PCH has been affected by heat.
Reheat using quality flux, trying to burn eventually accumulated crap.

Check again RTC signals.
PCH_INTVRMEN_L looks very close to lower limit...