You can get it from Panasonic or look for someone who carries a generic. So check your FET once again for that number. The camera will not record the CCD's image, but will record from the video input jack. Playback appears ok. The ccd-f40 has two transistors for switching video and audio.
Chances are the one for video is shorted or missing.
What I need to know is if I can buy that part. This noise can be heard along with the normal sound and sometimes is very annoying to the customer. Unfortunately, my shop does not have cable facilities and the noise is not heard when using an antenna. Your circuit is oscillating off frequency. Check all capacitors, you probably have a bad one.