Are you discussing any aspect of TA?
Here's a little AUD/JPY Rising Wedge failure.
Well I guess the orange lines suggested a reasonable rising wedge pattern, which would be bearish according to the TA books. Well I could probably find better examples of rising wedge failure, but really it doesn't matter.
Why did it fail? I don't know, nor do I think anyone can know exactly (save to say obviously the buyer came back in), and frankly I don't think it matters. Pattern failure happens often. Or patterns morph from one to another. For example an H&S can morph into a symmetrical triangle quite easily. It can be difficult to accurately identify patterns in realtime.
I have found S&R, market structure highs and lows, and looking for impulsive moves to be the most useful and reliable aspects of TA. They are also easy to work with.
I've seen some great examples of traders misinterpreting patterns. Finding H&S at market lows is a really funny one (not IHS either!).
Oh well, not sure that really helps the thread starter much, but still wanted to put in my 2c! Are you actually asking about chart TA failure anyway, or rather trading method failure?