820-3437 no power, orange safe light.

[iClub]

Good morning friend, this mac suffered oxidation in the region of u6100, u1900 and PLT_RST_BUF_L. Replaces u1900/U2071 and oxidized components around, but the mac will not turn on.

Voltages:
PPBUS_g3h 8.62V; PP3V42_g3h 3.41V; PP5V_s0 0v; PPVRTC_G3H 3.33V; ALL_SYS_PWRGD 0V; PP5V_S4RS3 0V~ fast pulse; PM_SLP_S4_L 1.46V; PM_SLP_S3_BUF_L pulse and 0V back;

 

[2informaticos]

"PM_SLP_S4_L 1.46V"
It stays on this voltage, or just pulsing?

 

[iClub]

It stays on this voltage, or just pulsing?

Only pulses.

 

[iClub]

I'm with the PP1V05_S0SW_PCH_HSIO mesh in short, had oxidized in the q8060 region, already removed u8005 but did not resolve.

 

[2informaticos]

Still short there without U8005?
Which is the exact ohm value?

 

[iClub]

Still short there without U8005?

yes.

L1290 1.0 Ω

 

[2informaticos]

Remove L1290/95 and see where the short remains.

 

[iClub]

Remove L1290/95 and see where the short remains.

short is in the PP1V05_S0SW_PCH_HSIO mesh.

 

[2informaticos]

Remove C1260/62 and check if short has gone.
If still present, bad PCH...

Any reason to quote an entire post visible few centimeters above???
I cannot understand why people still do this...

 

[iClub]

Remove capacitors, bad PCH

 

[2informaticos]

I wish you more luck with other board...