Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electro-medical.blogspot.com/
If blinks continue without any pause, the main board is faulty.
SOURCE: How do I determine if it's the LED Driver or the LED lights that are bad on my LG LED TV?
If it was the LEDs, then you should still have some working. My first thought would be the LED driver circuits.
Best of luck.
Your Tv has Led strip that is faulty you just have to check if they are receiving dc voltage if yes then change the Led strip if no check the voltage supplying the Led
you need to troubleshoot the defective component inside, but if you dont have the right tools for troubleshooting you should request a LG technician to service your TV. find the nearest LG Service Center in your area and consult the problem you encountered.
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