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Hello Bruce, and sorry you're having problems. Please send a reply when you see mine so I know you are with me.
The issue is one I'm familiar with on your set.
The issue that causes this is a convergence failure- the chips were getting weak, which is what caused the pop and for the convergence to go out of whack. This is the most common failure with these 3CRT rear projection units and the fix is to have the convergence IC's and fuses replaced. If you have this done at a shop you're looking at around $275 parts and labor which is steep on an older set. However if you're a DIY type and can solder, there's a kit at the link below that you can purchase to repair this yourself:
Alternatively you can use the link below to locate a shop in your area if you'd like:
Other than that, I'm sorry for the bad news and wish there were a quick fix.
If you need further assistance let me know. Please do not forget to click the 5 STAR RATING, at the top of the page for my efforts. It is my livelihood and you can follow up at any time if needed.