Working on my RCA 21D645 KCS97 again

[rca21d645]

I should probably clarify, when I had only replaced the electrolytics it did produce a picture, although it was tripled as if there was an issue with the horizontal frequency. It does still produce a raster, but no picture.

[Electronic M]

Originally Posted by rca21d645

I should probably clarify, when I had only replaced the electrolytics it did produce a picture, although it was tripled as if there was an issue with the horizontal frequency. It does still produce a raster, but no picture.

The horizontal frequency being wrong is a secondary issue. If you don't have an oscilloscope and experience using it you have to get video back before you can see what you need to see on screen to properly fix the horizontal frequency (which may only need a service control adjustment). There is a way to adjust horizontal frequency with a scope I use sometimes that I could tell about.

Troubleshoot the dead video tube heaters to get video back and once that's done we can properly address the horizontal frequency.

It sounds like all lytics and paper caps have been changed...once a recap has been done you need to fix remaining problems a stage at a time and prioritize issues that make other issues harder to fix. If you try to solve 2 issues at once both become harder. Divide and conquer.

[rca21d645]

I removed the video board and I found there was a crack right on the trace to the heater of the video output tube. I bridged the crack and now the tv functions fairly well.

[rca21d645]

From the way the picture looks I'm guessing the yoke needs to be adjusted because the picture looks slightly crooked. I'm not sure about the distortion at the top, I think it might be related to the horizontal but I'm not sure.