17 yr. old 35" RCA loses color intermittently. Picture & sound ok

Sorry you won's be able to find one but you can have an alternative picture tube model for your TV ! just go to your lock TV repair Shop they will suggest you!

It must be connected with the color circuit of your tv, a board connected to back end of the tube. Could be dust, cob web or carbon deposit shorting a transistor. Popping noise if loud enough can be attributed to high voltage circuit fault and picture tube.

Have it service by a qualified person.

Sounds like the red picture tube could be shorting internally which would cause the "all red" condition. In which case you'd have to replace the red tube. Are there horizontal (slightly slanted) lines through the picture as well when this is happening and a very very bright screen? If so it's most likely the tube.

Does anyone know where can I buy a screen for a 27" LCD Insignia TV. Model is NS-27LCD? My screen creaked. I checked out e-bay and have not found a broken TV with a good screen. Does anyone know where I can buy a screen at. 
Thank you all for you time. 
JC 

resolder the vertical output IC . bad solder there can make the CRTs blank for protection and you will lose the picture when the vertical drops out.

Do you know if i can use an inverter from any LCD tv, or does it have to be specific to that model? I was thinking about taking an inverter from another broken TV.

Bad tuner.......they are electronically divided in sections called
bandwidths, i.e. 2-6 , 7-13 so-on.........T.
Give accurate model # / service # for RCA part #............

would need a model number and if it that old wouldn't advise in fixing it.

It could be a bad solder connection on either the crt drive board that attaches to the neck of the picture tube, the video processing circuits on the main printed circuit board or the picture tube itself. If you can lightly bang the sides or top of the set to get the symptom to come/go, then it is most likely a bad connectiion. If, when the screen goes green, you see fine white lines diagnonally across the screen about a half inch apart, then it is likely the picture tube.

You may have a bad Fly Back transformer. The focus and screen(brightness) controls are located on this transformer. Some of the new RCA's have had problems with this transformer. If the screen control opens up the picture may either go dark or light which would cause your problem. Also a bad Picture tube could cause this. It shouldn't since the tv is not very old though. I've seen a few new ones go bad. Stargazer