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This sounds like a lazy lamp--that is getting hard to start. Try a new lamp first. If you are inclined to do so--get a bard bulb and install in the old lamp housing and save some money. Get a real PHILLIPS bulb--it will last a while--compared to cheap generics that are good for maybe 6 months !!
The tv problems and causes are 100% is the tv colors wheel it is causes and the tv problems.The tv are having humming or loud buzzing noises sounds are the causes of the tv colors wheel going off and out control of it motor mount and spinning in at high RPM speed and different colors showing up or flahes of black and white color in the tv back ground.The tv colors wheel must have to be replace.Best hire a tv tech to do the replacement of the tv colors wheel,because have to take out many mechanicals parts before can even come to the tv colors wheel is self to replace it.
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:
I would see if it's the lamp ballast only about $100.00 and easy to replace, it's the part underneath the lamp that fires up the bulb. The light engine itself is over $900 to buy and not worth it! I have same T.V.
Sounds like the bulb needs to be replaced. With the tv you have the Bulb last about 6000-8000 hours. If you think that is about right then you it most likely is time ro replace. You should be able to find the replacement bulb from the manufacture and then find it online to purchase.
That white cylinder is a capacitor and is very dangerous, you need to discharge it and replace it. Does the top seem to be bulging on it? If so, it is bad for sure and it is cheap for a new one. If it continues to buzz after replacing it, then your board has a problem. Replace capacitor before replacing lamp. The lamp still may be good