miked 
I can only suggest some tried and proven trouble shooting advice. 1. rethink when did the ghosting problem start (if you know that)? Then think what event was done just before that? Was a change made? Input cables, and/or was another device added inline or parallel to the LCD, cable box or signal splitter? 2. When trouble shooting any electronics device, the fastest method is isolate to circuitry that can cause the problem, by first eliminating what cannot. 3. Cut the circuitry that can cause this type of problem in half, by tracing back into circuitry, verifying what's OK and what's not. If all check good, from a mid point, that's good, you now go back and work forward with same step by step process, (I know as a marine avionics tech. you know this, just reminding what we were taught!). 4. Ghosting is almost always a feedback problem, impedance matching, bad RF shielding, isolation caps on AC input circuit, and don't forget about other equipment in proximity to and/or on same AC power source.
Maybe not much help, just a reminder of the basic 1, 2, and 3's of trouble shooting.
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