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If it's anything like my old Trinitron, ALL the solder joints will be bad. Get yourself a REALLY good magnifying glass, and actually remove all the circuit boards and just look over every square inch of them under a good light (I prefer sunlight). Cracked solder joints ('cold joints') are usually very obvious when you can see them well. A good joint should be smooth and shiny, a bad one will have an actual crack in it, though it's hard to catch unless you're REALLY paying attention.
Problem areas on any pcb are anything large sticking up from the board (big caps, plug sockets, soldered-on riser boards) and otherwise anything that exerts physical stress to the joints.
Speaking of which, doesn't that TV have riser boards plugged into the main board? Maybe the contacts are dirty. Blow it out like a Nintendo cartridge.
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