It's more than likely over-heating. You can try a Battery BackUp with AVR (Automatic Voltage Regulation) built-in to see if possibly your electricity isn't coming in as cleanly as it should. If that doesn't do anything different for you then you'll have to take it to either a repair shop or back to Best Buy (if it's still under warranty).
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Is this when the TV is on or off? If it occurs while the TV is on, is it constant or intermittent?
Try this: Unplug the TV. Hold down the power button on the TV for 30 seconds, while the TV is still unplugged. Then plug in the TV and turn it back on.
Similarly, power cycle the TV: turn it off, unplug it and leave unplugged for a couple minutes. Plug it back in and power it on. Reset settings back to factory defaults. If all else fails, I would recommend pursuing repair/replacement options.
1. Unplug unit from wall for 3 minutes; 2. Press & hold Power button for 1 minute; 3. Plug in unit. OR: 1. Unplug for 3 minutes. 2. Plug in unit. 3. HOLD Power Button as unit starts ... hold until the unit flickers on then off twice.
This effectively returns the components to factory specs, much like resetting a computer. It offers a *temporary* fix, lasting 45 minutes to hours. All depends on the unit.
Mom has an Insignia 32" with the same color separation problem, which worsens as the day progresses. Best results achieved while television is cold.
Dust in the unit could contribute to the problem ... try to keep the unit dust free as possible.
Best bet would be to unplug it completely and let it sit for about five minutes, plug it back in and turn it on, if it's still flickering there's more than likely something wrong with the backlight or the power supply. All Insignia TV's carry a 2 year manufactures warranty, so if it's less than two years old just take it to a Best Buy and have it serviced. It'll be gone for a few weeks, but either issue is an expensive fix.
Power supply board is the cause.The power supply board is shutting down,not giving the right voltage to the tv anymore.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Heres the dealyo.
Click start button
Click control panel
adjust screen resolution (probably have to go down) until the tv displays your computer
if this did not work, you will have to adjust bit rate from 32 to 16. Fiddle with the settings until the magic happens.
You will not get any sound unless you use an audio jack plugged into t.v.