had the same problem on my JVC GR-22US and even though I wasn't sure which one was the sensor (had an idea but cleaned anything that looked like a sensor anyway) and even though got no black gunk it did the trick. Thanks to people like you at least I still have a functioning product. This camera also had the 'lens cap' problem, as well not great video or audio quality. Only reason I don't use my old Sony is I needed something I could use with my computer and I thought this would be the trick but when as soon as I get a chance I will buy a Sony and use this one for batting practice. Roger

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