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Video and sound typically stay combined until the output of the video detector. If you have sound the tuner and IF are not dead...God only knows if fine tuning, IF and audio alignment are correct, or if your video amplifier works at all.
Without a scope or a means of/will to do signal injection such as the procedure I discussed earlier you're basically flying blind without instruments.
There comes a time where the value of the time you waste trying to make do with insufficient test gear is worth so many times the cost of a working used $50 1970s or newer scope, B&K analyst, etc that NOT buying one is costing you much more than buying one.
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