RCA D61W20B WHEN YOU GO TO TURN ON GREEN LIGHT COMES ON FOR 3 SECONDS 3 TIMES, AND THERE ARE NO CLICKS OR OTHER NOISES, FOR AWHILE IT WAS HARD TO TURN ON. ANY HELP THANKS JIM

A green LED that blinks On and Off is an indication on some models that the TV is receiving commands from a remote. By modelling, it just check SYN, SYN-ACK signal between transmitter and receiver. No worries.

Check the Flyback Transformer and Hot. especially if its a soft ticking sound

turn my tv on and after 15 minutes it turns off by it self

first check all fuses they are small, square ,RED and can be confused with the square small caps. the sizzling is prob. the flyback transformer (what the h.v. wires from each tube plugs into) if you are only getting green then tv shuts down or is dead now. i would replace any bad fuses and replace the flyback transformer. also make sure you do a very good visual inspection of all the boards.

On the Deflection board CK capacitors cp150,cp114 cp120,If cp 150 is puffed up on top it is bad so replace all 3 capacitors 2200uf 16 use 25v and Two left are 220uf 35v Resolder pinns on flyback Transfomer and when re hooking board back up make sure you have second ribbon connector in good. Board next to Deflection is the SSB it has turners on it where you hook cable.

the 3 blinks is definately meaning the flyback is defective. You need to replace the flyback its number 259296 you can get a replacement flyback at the following link with free installation instructions with step by step pictures of the repair. Heres the link.
http://servicemanuals.vstore.ca/

I have the same problem; I push the power button green light comes on tv clicks but doesn't come on.

You have discribe a problem that sounds like a powersupply cap. It may also be more than one. LOOK at the board very hard for bad caps.