820-00164a quarter fan spin

[Yoel Ren]

Hi, I have a 820-00164a, very pristine, no liquid or corrosion anywhere, does a quarter fan spin when magsafe plugged in, I have green to orange light on charger
PPBUS_g3H : 8.6v
pp3 v42_g3h : 3.41v
PCH_INTRDR_L = 1.9v
PCH_INTVRSMEN = 1.5v
PPVRTC and other rtc signal is 3.3v

pp5v_s5 = 5v
pp3v3_s5 : 3.3v
smc_reset_L = 2.9v ( is this too low ? )

pm_pwrbtn_L is pulsing when on offed

 

[2informaticos]

"PCH_INTRDR_L = 1.9v
PCH_INTVRSMEN = 1.5v"
Try to post correct signal names.

Looks like you have a PCH issue.
Both signals are derived from PPVRTC_G3H (which is good) and go to PCH.
Put quality flux and heat PCH area to 180-200 degrees.
Pray to have only coorosion issue under PCH...

 

[Yoel Ren]

heating with flux, then it become full speed fan spin when magsafe plugged in, but pch signal voltage still the same
should I change the resistor with lower resistance ? will it help ?

 

[2informaticos]

If the resistors have correct values and 3.3V at input, then PCH sinks to much current on these lines.
It is not normal at all.
You can force both signals lowering resistors value, but is pretty hopeless...

 

[Yoel Ren]

alright straight to the dumpster then, thanks for the help, can mark as sovled

 

[KC Micro Tronix]

usually PCH issues are pretty black and white. it's shorted it's usually really shorted.
I use a water pick to spray soapy water under the BGA chips then clean with compressed air. I am not sure I would give up that easy on that board unless it's a 4g board or something of little value.