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Have you Cleaned mirror and top of all 3 tube lenses, then adjust the screen and focus to each Tube R/G/B After cleaning go to menu then turn color OFF then adjust all 3 tubes as close as you can to a Black and white picture then turn color back on.
Can you unplug the TV for about 15 seconds, and then plug back in and watch the stand-by light. Tell me how many time the stand-by light blinks in regular intervals. If it doesn't blink at all, you need to change a fuse on the g-board. Once this is done run back through the stand-by blink light process, and more troubleshooting can be done if problem isn't already solved. If the stand-by light just keeps blinking with a count over ten just tell me, and I'll look for other possibilities.
It can be many things.
Start with the basics.
Unplug the TV for 20 minutes. Unplug it while on!
If that does not reset the controls when you plug it back in, it may be the circuit board.
Have you had severe lightning?
Also try resetting you BIG Circuit breaker but I doubt that will do much.
If that outlet has gone bad, a reset will fix it.
A dimming indicates a fried circuit board or one with allot of dust and a short is forming.
Dust can cause this too.
sounds to me to be a shorted HOT transistor or short somewhere.
the click sound is the switch mode power suppy powering up sensing a short and quickly shuts down. the hot transitor is mounted to a heatsink
near your flyback. check for emitter to collector short. you can try replacing it if shorted and if lucky that all that was ..but if shorts again you looking at probably a bad flyback.
If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages.
Try the suggestions on this post from the Troubleshooting page: