820-00165 No Boot

[Instafixx]

PPBUS is at 8.44V
Fan Spins.
I have Magsafe light and it pulls 530 Amps on the PSU.

Work is done on the board previously.

SMC reflowed or changed.
Pin 8 of U1950 is connected to Pin 1 of C1950 via a jumper wire.

 

[2informaticos]

Rebuild U1950 area...

 

[Instafixx]

I did remove and reballed it. Same

 

[2informaticos]

Did you reconstruct the traces?

Reballed what?
That is not BGA chip.
Post its voltages.

 

[Instafixx]

ALL SYS PWRGD is 3.3V
CPUVT PGOOD R IS 3.3V
SYS-PWROK R IS 3.4V
PM S0 PGOOD IS 3.4V
SMC DELAYED PWRGD IS 3.4V
PP3V42 IS 3.4V

RECONSTRUCTING TRACES ISNT REQUIRED AS ALL POINTS LOOKED OK AND ALL VOLTAGES WERE THERE I FEEL.

BUT IF YOU THINK IT NEEDS TO BE DONE THEN PLEASE GUIDE

 

[Instafixx]

Q3080 is a bit crakced - just noticed.

TBTBST_PWREN_DIV_L is 8.04V
PPVIN_S)SW_TBTBST_FET is 0V

 

[2informaticos]

I meant to reconstruct the traces as should be; separate pins 1 & 8.
Then post again the voltages.

PLT_RESET_L goes high?

 

[Instafixx]

How do i reconstruct the traces ? Pin 8 is going through the Pin of C1950.

 

[2informaticos]

Tiny wire (0.01-0.03mm) can be placed on the pad under the chip.

 

[Instafixx]

just solder it on point 8 and then put the chip back ?

 

[2informaticos]

Yes, be sure to get good contact for pin 8.

 

[Instafixx]

Did that .

Not getting 3.42 on Pin 8.

The board point there is damaged and i think the jumper from C1950 was needed.

All_SYS_PWRGD is 3.3V

Rest all below 1V.

 

[2informaticos]

Reconstruct pin 8 trace until 3V42_G3H.
Shouldn't be complicated; check boardview.

 

[Instafixx]

It was reconstructed previously- in the image

 

[2informaticos]

"Not getting 3.42 on Pin 8"
How did you reconstruct it then???

 

[Instafixx]

I am saying that the jumper wire was there before we did anything and there was 3.4V on Pin 8

 

[2informaticos]

Mea culpa, you've mentioned pins 8 & 1 of U/C1950.
I was thinking both pins are from U1950.
Do you actually have 3V at pin 8?

 

[Instafixx]

Yes in the original setting it had 3.4V.

 

[2informaticos]

Post all U1950 voltages.
Also voltage on big coils.

 

[Instafixx]

ALL SYS PWRGD is 3.3V
CPUVT PGOOD R IS 3.3V
SYS-PWROK R IS 3.4V
PM S0 PGOOD IS 3.4V
SMC DELAYED PWRGD IS 3.4V
PP3V42 IS 3.4V

Voltages are stable till the time fan spins.

L7520 5V
L7560 3.3V
L7430 1.2V
L7630 1V
L7130 8.4V
L3095 0V
L7310/L7320 1.8V

THE FAN STOPS SPINING SOMETIMES WHEN THE PROBES TOUCH THE POINTS. ITS TOTALLY RANDOM