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If the buzzing noise sounds like a fork in the microwave, it's time for a new lamp. If it sounds like a squealing noise, it's either a fan or the color wheel. Color wheels are not easy to replace, so I recommend hiring a Service Tech.
The colors wheel was defective,was spinning off of it axis that was where the buzzing noise came from.Now the colors wheel it totally dead,that why u not hearing anymore buzzing noise,and not getting a picture.Hire a tv repairman for this job.Replacing DLP tvs colors wheel is not easy,if u have no machanical's skills and never done this before.
First. The whirring or buzzing sound you hear is the Color Wheel and it needs to be replaced. Second, since I do not know when and if the original lamp has been replaced it is a good idea to replaced the lamp. The bad Color Wheel is the one causing the set to shut down.
The Lamp probably is bad but it going bad would not cause a buzzing sound. I have a hunch that the Color Wheel Motor is bad causing the buzzing noise. It is a major repair and the cost would be expensive. But this is the deal, you will need to get a qualified repair person out to confirm the symptom to be sure. You can go ahead and replace the Lamp to get the set working again and use it for as long as you can stand the buzzing noise. If it is the Color Wheel Motor, I would check prices on replacement sets just to get a feel of how much you are willing to spend for repairs.
I hope this helps,
if your model is the HDLP50W151 your color wheel is 212.00 at the following link and they provide free instalation instructions and also free tech support to help you with the Indexing when your finished as all color wheels in RCA TVs have to be indexed after instalation. You need color wheel 212184 heres the link
Click on the color wheel catagory on the left column. http://servicemanuals.vstore.ca/
If you hear a ticking and or buzzing sound as it is trying to start up then most likely the replacement lamp is bad. Take it out and reseat it one more time to see what happens. The noise you hear is the ballast attempting to fire the lamp up.