820-3476 - Power but no chime and image

Sykulski

Member
Liquid damage that was cleaned by somebody else.

When power on fan spins - then stops - then spins again and slowly ramps up and keep on spinning

On first fan spin there is 3.2V on pin 5 (SPI_MOSI) and 6 (SPI_CLK) for 2-3 seconds but then drops and does not come back on along with the next fan spin

SPI termination resistors and traces are fine. Replaced U6100 (still have the original) but no dice

5V_S0 = 5.1V
3V3_S0 = 3.3V
1V05 = 1.05V
1V35 = 1.35V
PPVCC = 1.7V
PPVRTC = 3.3V
PCH_CLK32 = 32KHz

Any clues ?
 

Gurmon

Member
Probably a dead CPU. Other than that no idea.

Have you Ultrasonically cleaned this board yourself. Might be crap under chip.
 

Sykulski

Member
Pulled SMC and measured termination resistors and traces all the way to the site. They are all good. Replaced the SMC with another one. Still same symptoms :-(
 
Last edited:

dukefawks

Administrator
Ugh, well this one is going to suck. Not much more you can do than inspect for corrosion or damaged/missing parts. Mostly around SMC or CPU area
 

Sykulski

Member
It sucks already :) I've been looking at all components on this board on maximum magnification for hours :)
 
Top