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In some cases the buzz is external. The vibration of the unit may just cause a tray, flat surface, or other surrounding attachments to rattle and buzz. Look for anything that may be loose or laying on or about the TV.
See attached photo: you have a bad color wheel----it turns at about 12,000 rpm and bearings in the tiny motor go bad.
High pitched or fan like sound is classic symptom.
The wheel is available on the internet and You Tube has video instructions by model number for replacing it---Google the model number for the part number for your set to locate the part and instructions.
This for most people is a do it yourself job---takes like 45 minutes start to finish.
If color wheel slows too much set will shut down as its speed is monitored and the wheel can even shatter causing shutdown of the set.
Loud sound would be coming from defective color wheel that is mounted i light engine, next to lamp housing. Replacement of color wheel is required expertise/ experience and professional will do that for you in correct and in safe manner. Contact local tv repair shop to get color wheel replaced in tv. Thanks.
Buzzing sound is the Color Wheel # BP96-00250A $83.25 Encompass Parts has them in stock 1-800-638-3328 and for Lamp Call FOX 1-800-227-5369 I got my Lamp off of E-Bay $85.00 I have the Same TV.
It is possible the lamps may be defective or that they may be the wrong replacement for this model, as it may have a different wattage setup with the ballast. If you want to try to order the TB25 lamp from a different vendor, you can order the original Toshiba replacement lamp for this model (52HM84) from a major Toshiba parts distributor at the link below:
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