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FC powers RX only if USB is connected?

blog entry which exactly describe this behavior for FCs which have issues on the (5V) power lane. So I tested for shorts between pins, on +5V line and GND, but nothing strange. … Then I used an external lab PSU to power ESC and FC externally by 14.8V and separately both are fine. But combined the mentioned strange behavior and the voltage on the PSU dropped drastically. …
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