DVX100A with Too Much Audio Hiss Noise

I got DVX100A. When I'm shooting I get a lot of hiss from my headphone. Even I switch the audio input to external and I disconnect the mic cable, still get hiss. It is not recorded on the tape. But I can't tell if I'm getting the clean signal or not until I play the tape on other machine. I sent DVX100A to repair shop. Looks like they can't find anything wrong. As a professional camera, this is not acceptable. I have been using Sony PD150. PD150 is not like this. Anyone has this problem?

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