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How much wattage is going through the timer and what is its rated load max? try unplugging whatever is plugged into it and see if it stops but if you exceeded the max load might be damage to the internals which can cause that buzz.
The 2200 uF capacitor in the power supply has gone bad and the humming is a 60 Hz from the rectification of AC to 18 vDC. Either get a new power supply or take apart the power supply and replace the bad cap.
You have a cracked Plasma panel. If u remove the back cover of TV and look in the top left of the plasma panel u will see a small round cylinder tube with glass tip inside. Look with a flashlight and u might see the crack. OH the buzzing noise is from the current going through the panel just not ignition the gases inside the panel to light the phospher cells. Hope this helps.
Could be the result of having DTS compatible equipment connected through the analog inputs on the VSX-409D. Noise and distortion will result as essentially the DTS signal is being played back undecoded. If this is the case you'll have to connect your LD or CD player through the digital connections (coax or optical) and set 'Signal Select' (button on front) to 'Digital'.
I purchased a poloroid tv 3732 in may of 2005 from circuit city, after about 14 months the set began making a clacking sound and humming sound that gets so loud it is unbareable. I have to turn the set off. I have found out I am not the only one with this problem that has a poloroid tv. I had a technician at my home that told me there is a service warranty on these sets because the wrong part was used and the part needs to be replaced.