820-3115-b lags and fan spinning high

Checked this board under microscope and found pull down resistor of u3990 was corroded, replaced it and it worked fine until i removed its heat sink to apply thermal paste. The fans started spinning fast after i assembled it back.
ran asd and it showed
ta0p
tc0p
th0p
tm0p failed smc i/o.

i have replaced u5511 and checked all the resistors but everything looks fine, i even compared values of q5520, q5510,q5515 with working board and they all are same but fans are constantly spinning on high rpm.
r
 
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