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If you do a lot of TV work having a B&K 10xx series analyst is worth while...troubles like these can be localized fast with one as the analyst can generate video of both polarities and adjustible amplitude to check video stages by injection and RF and IF test signals (and any other signal you'd need to troubleshoot any other problem).
Direct video injection and audio injection into the video are both valid signal injection methods when you have limited equipment on hand.
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