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The first thing I would try is to disconnect the tv from the power source. Wait five minutes before plugging it back into the wall socket. Turn the tv back on and see if you get a display. Try changing the channel and switching inputs. See if you can get it to display anything at all. You could shine a flashlight at the screen and see if you can make out an image. If you see an image with a flashlight then your backlight is out.
Is your tv less than a year old? If it is less than a year old you are still under the manufacturer's warranty. I would see if Best Buy would honor the manufacturer's warranty in store. If that is not the case they should give you a number to contact Insignia directly.
If your tv is out of warranty, it may be cheaper to replace it. I would do your homework and check the price of a repair vs the price of a new tv.
This set should still be under a manufacturers warranty. This set has a board that is very hard to get. Do not let them tell you to wait, or you will wait and not get the set repaired. You need to call and have them repair or have them replace the set before the warranty runs out. If you do you will have a hunk of junk.. Good Luck
It could actually be quite a few things, loose wire, loose solder piece, bad crt's/picture tube, bad system board, or others. It's would have to be diagnosed with testing equipment. It will probably cost you another 150-200 for the new part to be put in.
I unscrewed all the screws in the back, detached the tv from the base, and was able to get the back off. I ordered a new power supply board and will install it to see if it fixes the problem with the tv (won't turn on, insignia light alternates between red and blue). I didn't notice any problems with "swollen" capacitors, so if the new power board fixes the problem I'll update this website.
If your TV is less then a year old, still under manufacturers warranty. If not under warranty the defective parts could be the power supply or the back light inverter board. Both boards can be replace easily.
The way to know if you have a defective backlight inverter is by shinning a light from a flash light near the screen with the TV on and check in a 45 degrees angle if you have a dark video in the background, if the video is present then you have a backlight board failure. If no video, then is a power supply failure.
I have both boards if you want to buy them.
Let me know if you require further assistance.
WIth the set only 7 months old, it should still be under warranty. The problem now is that by opening it up, you effectively have voided the warranty. That being said, the problem is that a problem has been detected internally and the set shuts down to prevent further damage. The first suspect is the main power supply board. I would try for warranty service first. If that is not available a local service shop should be able to take some measurements inside to detemine whether the power supply is not working correctly or if the suply is being told to shutdown. WIth what little info is available here and not being able to examine the actual unit, remote diagnosis will be difficult.