820-00165 No Boot

Instafixx

Member
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.
 

Instafixx

Member
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
 

2informaticos

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

PLT_RESET_L goes high?
 

Instafixx

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

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Instafixx

Member
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

Administrator
Staff member
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

Member
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
 
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