Television and Home Theater

I'm looking to replace component Q401 in my samsung tv. It's marked C5936 I'm guessing KSC5936. I am unable to locate this component anywhere or even a data sheet on it. Does antone know a suitable replacement for it. Tv is a samsung TXR2735X chassis KS7a

I have a Mits 62725 and recently I heard sound fluctuations coming from a fan in the tv. I think there are two or more fans and this fluctuating noise does not apear to be coming from the large fan that cools the bulb, but a smaller fan over the circuit board that is on all the time.  I'm thinking of opening the back and replacing the small fan and the bulb while I'm at it (over 5 yrs in use). My service center wants $155 to show up at the house and won't sell me parts. My questions: