We have an electrical circuit with these loads (all on different outlets): 15W aquarium pump, 250W LCD television, 35W cable box, 13W GoogleTV box, and a 100W ceiling fan (plus an integrated 50W halogen bulb). I believe this is a standard 20A circuit. this is in Minnesota in North America, and at 110 VAC, we should easily be able to run up to 1600 watts (calculating for an inductive load, which is not the case).
All of these things have been running at the same time without any problems, for over 4 years - new construction.
However, for the past couple of weeks, the television's screen flickers off and on whenever I blip the ceiling fan's rotary dial - turn the fan's dial on and then off, and the screen goes dark for a second or two.
It doesn't appear to be a problem with the television itself (at least, none that the internet can help identify). All of these loads (but for the fan) are active for several hours a day.
I've tried disconnecting each of these devices in attempts to figure out what's causing this behavior. The only thing that seems to set this off is the 13W GoogleTV box. when this box is unplugged, the television won't flicker when the dial is blipped.
This doesn't make any sense at all. We should easily be able to run a peak load of 1600W, and with everything plugged in, we have somewhere in the region of 500W.
Is there anything else I should look for, or is it time to throw in the towel and call in an electrician? I can take care of reasonably DIY-able circuitry, wiring changes, etc.