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Hello; The noise when turning set off is likely the fan that cools the lamp down gradually. The lamp can crack if the fan does not work. Dust in the fan can also add to the noise. When the set is turned on, the microcomputer watches the lamp come up to full brightness and shows this with the LED colors. All lamps containing mercury take time to get up to full brightness.This also applies to mercury compact florescent lamps, yard lights, and even neon signs that contain mercury.
I have the exact TV and had the exact same problems. It is the light engine with color wheel that needs to be replaced, and they are VERY hard to come by for this model. Our repairman has had our TV for 5 months and still cannot locate a vendor that carries the part. He said according to Toshiba, the part has been discontinued. If you happen to find one, please post. I'll do the same.
Read the section about the red/green lights in front. It sounds like the lamp went out. Mine consistently goes out once every year to year and a half. If you plan on keeping the television, purchase two bulbs, so you have one on hand in case your new one goes out.
I have the same problem. This is the second bulb in 6 months. The first one lasted 13 months. The bulb explodes inside and makes a loud snap noise, like an arc. The repair guy said it was the ballast along with the bulb. Good luck
IF YOU REPLACED THE SAME PICO FUSE, YOU PROBABLY HAVE A BAD CONVERGENCE IC AGAIN . DID YOY SNUG UP THE IC TO THE HEAT SINK AND USE THERMAL HEAT COMPOUND ON THE NEW IC'S? ALSO CHECK SOLDER CONNECTIONS TO C810 AND C809 THE FUSE BY THE CAPACITORS MAY BE OPEN.
If you have the owners manual look on page 64 and see what it says there about the light lighting up in the front of the unit. if you do not have the owners manual, you can get one for free here: