A1466 820-3437-B no power

[hgoncalves]

HI,

I have an A1466 820-3437-B with no power. It had liquid contact (a bit of coffee, not much), and i replaced the U1959, C1950 and R8167 that had a bit od corrosion, but with no sucess. It had the J6100 with a lot of corrosion, and I have taked it out.
It has green light, but no fan spin, and it consumes 95 mA on PSU.

The SYS_PWROK_R test point is missing and don't know if it is essencial (it had corrosion and disappeared when i cleaned with IPA), and i have 0V on SYS_PWROK_R.

Can you help?

 

[2informaticos]

You must check all SPI Bus Series Termination resisotrs and their traces.
Do you get any pulse on the coils?
Steady 3V3_S5/SUS?

 

[hgoncalves]

Hi,

R6128 = 24.97 ohms
R6127 = 42.85 ohms
R6126 = 42.63 ohms
R6125 = 43.30 ohms
R6110 = 15 ohms
R6120 = 43.28 ohms
R6111 = 15 ohms
R6121 = 43.30 ohms
R6112 = 15 ohms
R6122 = 42.87 ohms
R6113 = 14.94 ohms
R6123 = 24.87 ohms
R6114 = 25 ohms
R6115 = 14.90 ohms
R6116 = 15 ohms
R6117 = 14.98 ohms

All traces seams good.

All coils seams to have the proper voltages, besides L7701 and L3095 that have 0V ( I think that's because i have no LCD connected).

3V3_S5 = 3.3 steady
PP3V3_SUS = 3.3 steady

 

[2informaticos]

Do you have good trace between U1950 and R1962?

 

[hgoncalves]

Yes, i do, but i have 0V on pin3 of U1950.
It seams that i don't have trace between R8166 and R8167. I'm going to replace R8167...

 

[hgoncalves]

It worked.
It seams that the R8167, besides it has the right resistance, had something wrong with it. After replacement it worked.
Thanks!