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Some TVs do use three ICs, one for each colour. These ICs are likely all identical. There could be fuses blown. Fuses can look just like resistors. A manual points them out or they are shown on the board as F101, or ICP 101 or CP101 or the like. Fuses usually affect ALL the colours at once, so I am looking for the third IC.
If your picures are all purple it means that the green colour is missing. TV colour is made up by mixing Red, Green & Blue. Removing Green leaving Red & Blue makes purple. Study the green colour circuit for a fault and confirm that the green gun inside the tube is working.
The RCA model is a 3 CRT projection TV. Most probably you need a new RED CRT, or there is a problem with the R(ed) channel (the picture is made up of 3 component colors: Red, Green and Blue). No way of telling without testing of the projector. Sorry!
You have a problem with the blue and green tubes having a fungus growing across the face of the tube, thus blocking the light/picture. This will cause the color to be way off and the focus as well. Need to have the fluid changed in blue and green tubes. The red never seems to be affected...must be the red wave lenght inhibits the growth of algee or something. Anyway....That's what you need, not the convergance chip STK's. Trust me on this. T.V. tech. for over 20 years...see this ALL the time. Good luck.
Dave,,yes the tv is worth fixing the ic part you need is STK 392-010 and at this site i will give the link to they are 19.99 each you will need 2 if you get them at the link I posted you will also get free online tech support plus installation instructions with pictures http://servicemanuals.vstore.ca/