[timmy]

Originally Posted by Yamamaya42

Once again, you will be likely finding yourself up the creek without a paddle here (an oscilloscope), with very little to guide you in the right direction, for all you know, the IF could be acting up again, and annihilating the color sync information before it can be processed.

A good start that is IF you had a scope, would be to check the beat pattern going into V22, chroma phase detector, fed from the burst amp, this is what locks in the ref osc.

I can’t see how the IF could be the culprit it’s been fine I still have a good b&w picture still it gradually got harder for the color to sync up now it’s gone