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If it is source-dependent, there are likely variations in programme luminance content. Sometimes a DVD will flaunt the monitors' tiny errors.
For example, a strong signal with minimal attenuation in the highest of video frequencies(minimal sharpness) will tend to look the best, but wil usually be the most crucifyingly transparent when it comes to any defects.
On a set with power supply issues, in the form of either poor filtering on the supply rails or noise entering the video after the IF strip, It will never perform as new until the issue is eliminated.
Case in point, a 1981 zenith 19" with 9-160 mainobard and direct-entry tuner, hard power switch/vol. I used to use.
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