I have a JVC HM100u. I just started having two dead pixels show up when the camera gets really warm. Sadly, there is not a pixel compensation for the GY HM100u. I emailed the JVC tech support. Here’s the response:
“the diagnostic fee is 50 dollars and the hourly rate is 120 dollars plus parts”
Yikes! Pretty pricey. BUT, this plug-in for FCP is amazing. It’s $59, but SO worth it.
https://www.digital-heaven.co.uk/dh_reincarnation
Trust me….best 59 bucks I’ve spent (For now, until I can afford to send my camera out).