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That's just the way the camera works. The first flash allows the camera to judge how much light it needs, and it sets the second flash appropriately when it takes the picture. More sophisticated (and expensive) cameras have a manual mode, where the power of the flash is controlled manually, eliminating the need for the first, pre-flash. With most point&shoot cameras, you're stuck with it.
It is possible that the last time this was connected there must have been an higher input applied than is recommeded so that the input PRE_AMPS were loaded to fail.
You need to check with an signal trace on the input to find if an OP-AMP has failed or the LOGIC switching IC had failed.
Need to test using a signal tester and meter.
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