Right now your TV is in Protection Mode because of a failed part inside the TV. The 7 blinks should be an error code for helping to diagnose the faulty part. I don't have the repair manual for your TV model to tell you what the code means. But, I'm sure it's a power supply board related issue.
If you have some electronic experience, you can sometimes find a Service Manual over the internet for less than $20. It will have schematics, diagrams, error code list, and part numbers for the TV. Most cases the part can be found by searching over the internet by the part number.
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