Not Quite Sure What To Call This

[vts1134]

Originally Posted by vts1134

I don't know if it is apropos to this problem but the contrast control on this set seems more like an on/off switch. There is only three different settings- no video- weak contrast- good contrast. Other sets that I have are more of a gradual even ramping of the contrast level from no video to over driven.

I'm turning back to this thought. I've scoped the video output of the set and it confirms this description. At one end of my picture control setting I have no video, as I turn up the control I get a gradual increase in signal but at about 1/3 of the way up the signal stops increasing. When I meter the impedance at the control itself I get the results you see in the video below. I am adjusting the picture control at the same rate for the entire time the video is being shot.

http://www.youtube.com/watch?v=jmCvh9sm0Wg

Would this point to a malfunctioning picture control pot?