Question about BenQ DV3250 Television
Since you can hear noise in the fan or coming from the fan, I would say you need to take it off. I do not know how old your tv is but I can tell you that quiet fans in lcd as well as plasma tvs the size of yours are notorious for collecting lint and dust from the air as they try to cool the heat sunk components on your printed circuit boards and power supply. I would first take the back off and be sure to unplug it first. If you are standing on carpet, be sure to touch the frame once it is open so you can discharge any static electricity that you may have. You will be able to readily see that the quiet fan has a small connector connected to the power supply board (usually). Do not worry it is keyed so that you cannot plug it in backwards. Unplug it and undo the screws (usually 4) holding the fan to the back cover. Unless your tv is brand new, I know you will find considerable lint and dust on it (more if you have the tv in a carpeted room). Use some type of compressed air to dust it off (clean canned compressed air (usually sold at Radio Shack or other electronic supply businesses have them). Its like a can of wd40 with a straw nozzle except it sprays clean (not moist) compressed air. A regular air compressor has a tendency to spew out some moisture and that is not good for any electronic component. A good air output on a vacuum cleaner would also work. When you turn the fan by hand you will be able to see a very small opening around the whole circumference where it is turning. Try to blow some air into that to force out any lint and dust that might be there. If the problem is that the bearing inside the fan is drying up like wheel bearings on a car, you need to lubricate it. If it is noise that you can hear, then as you hold it in your hand you will also be able to feel it as you turn it manually. I have always used what is called clock oil or machine oil but in a spray can. Spray very little through the opening that you see around the circumference, but just a little at a time and turn it by hand. It only takes a couple of small sprays to quiet the fan down. If it does not, then you can replace it yourself by taking it to an electronics supply house and they can match it for you so the replacement fits where it is suppose to. If there are any tv repair shops around you close by take it to them as they may have one that is used buy still quiet from the ones they strip off tvs that they could not fix. To put it back is obvious. you will have to splice the two wires on the new one to the old one so that you still have use of the keyed connector on the end of the original fan. Good luck and God bless you. Robert
Posted on Jan 07, 2009
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