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You need to dertermine if the power board failing charred the connectors, or if a differeb=nt component failed which charred the connectors and took out the power board. This will require component level testing. i suggest taking it in to the repair shop.
However, i would price shop a comparable replacement TV before fixing a 4 year old Insignia. it may be more cost effective to just replace it.
This is a problem with a aging of the television tuner section of the television. the line you are seeing are noise lines on the scan rate. This could be minor component aging and failure. Or it could be problems with the television tuner itself. Loss of tolerances.The problem should be looked at by a service center where they will have all the service information to work on the television. You can call Insignia customer support at this telephone number 1-877-467-4289. Or visit the customer support section on their website. www.insignia-products.com. Give them the model number of the television and they should be able to tell you where to take or ship your television for servicing. I hope this information helps you with your problem.
I had a similar problem. I then noticed that my antenna has a RG6 cable. This is good. My TV requires RG6 and requires TV(RF) cable that is also RG6. Insignia comes with a TV(RF) cable that is RG59! That's a cable with a smaller diameter center connector than RG6. Consequently, when that smaller RG59 was run from the converter box to the TV's larger RG6 female connector, no signal connection was completed since the center connector made no physical contact with the TV's female connector. I found a RG6 cable to replace the RG59 cable supplied with converter box and all worked then. Also, you must force the antenna's RG6 male plug into the smaller RG59 female connector, but it'll make it.