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Fan very noisy - Sony PFM-42B2 42 in. Plasma HDTV

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It is unusual for fans to become noisy buy with the power off you can check to see if it the fan has something trapped in it - in which case remove it. Also check to see if there is any blade damage. Check to make sure it is securely fastened and if not tighten the screws / bolts that secure it. Spin the blades with your finger to see if it makes any noise, wobbles or is difficult to move. If so then it may need replacing. Make sure the blades do not protrude out of the casing - if so push down on the centre of the blade to see if it will go back into position. The power to the fan may be unregulated so the fan may change speed and effectively pulse and therefore change pitch – check the supply voltage and ripple content. Other than that the fan may just need replacing.

Posted on Nov 13, 2009

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