[Tig] Jvc Camera Color Delay Issue

Fred Kovach fkovach at globaluniversity.edu
Sun Jul 6 23:28:21 BST 2014

Hi Bob,

I was able to get the model number after the last service.  The camera is a JVC GY-HD250.

It is possible for either a knock or tweaking to have occurred.  I am a volunteer at this location every other week, and occasionally to service the equipment as requested.  Although church technical staff is on site full time, it is possible that it was knocked over while they were not there.  Although they will do quite a bit of technical work, they generally will not open up and do tweaking.  It is more likely that someone would tweak on the RCU, that possibility was eliminated when the problem followed the camera, not the RCU.

I am going to inquire to see if they know of anything that might have occurred or been done and I will keep everyone posted.


Fred Kovach,
Chief Engineer,
GU eMedia Productions
-----Original Message-----
From: Tig [mailto:tig-bounces at colorist.org] On Behalf Of Bob Kertesz via Tig
Sent: Sunday, July 06, 2014 4:56 PM
To: tig at tig.colorist.org
Subject: Re: [Tig] Jvc Camera Color Delay Issue

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>Now that I've looked at it closer, I can see that blue is delayed by several lines.

The blue channel is offset vertically by quite a few lines.

Since moving the camera made the problem follow the camera, it's most likely in the head. 

Without knowing the model number, I can only make some educated guesses, none of which can be field repaired.

If it's a 3 chip camera, the blue sensor or part of the prism has shifted.

It could be a detail circuitry issue (kinda doubtful, but maybe).

Some processor along the signal path has lost its mind.

All of these will require the camera be sent to JVC for repair. If it's a sensor/prism issue, and the camera is out of warranty, it's likely not worth fixing.


Bob Kertesz
BlueScreen LLC
Hollywood, California
bob at bluescreen.com

DIT, Video Controller, and live compositor extraordinaire. 

High quality images for more than four decades - whether you've wanted them or not.(c)

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