Sounds like you have a gun or picture tube shorting. check the bottom of the tubes when you turn it on and see it one of them is lit up more then the other two if you find that then unplug the circut board thats pluged into the tube and turn on the tv again and see if you problem goes away minus that color.
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The tv have picture look like a bright dull hallow glow to the screen,yes,than the tv CRT tubes coolant chemicals is bad.Tries websites like Tvrepairworld.com,Tvrepairkits.com to buy a coolant kit to do the replacement.
This is usually caused by video signals overdriving circuits. Too much video causes what you are describing. This is sometimes caused by a bad cable or connection, either a TV cable or a video cable. Hopefully it's not a projector problem. If you can check the connections from your receivers and VCR with the projector on you might be able to pin point the problem. Be gentle and if there is adoubt about a cable, just replace it.
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
They should be adjusted to set voltages. however it is best to shut the color level to the lowest setting then try t balance the screens to achieve the best black and white picture. then turn up your color level. Your brightness level should also be set to 50 % then when you adjust for the best B&W picture. You will have better color and brightness when you reset your color and brightness levels. Hope this helps.
If the sound, sounds more like a Hum with some vibration chances are the Cooling fan located behind the lamp is going bad, about $20 to repair, if its a high pitch hum most likely the Color Wheel and if thats the case about $30.
Good luck, my fan just went bad now seeing green dots everywhere, so debating on just junking it out or fixing it, with winter coming on might just breakdown and buy LCD and say the heck with DLP from now on.
Good luck to you..