After a significant warm-up (4-5 hours), connected to cable (no set-top box - Straight cable) every channel, as well as the 2-3 second black screens displayed BETWEEN channels (while switching channels)shows a "bloom" of RF noise over the center and top portion of the displayed channel - Within the noise/snow, I can see images that are obviously from another channel. No popped/leaking caps, re-flowed all solder joints on power board and main board - No difference. Tried component cooler on key components while issue was presenting) with no obvious change. It appears to me to be an RF/tuner issue. Anyone seen similar issues & can offer a suggestion beyond simply replacing the rf/tuner (input) board?

Televison & Video - Element Electronics - PLX4202B 42 in. Plasma TV