I have an insignia ns-55l260a13. originally the screen was shutting off but after power cycle it did come back. we thought its due to chromecast power drain via USB connection. Now we moved chromecast to be powered from external usb charger and that did work fine for some time. in a few month the TV stopped turning on at all. The led light brings solid, then 5 short, pause, 2 short and stays on. Screen blinks and nothing happens afterwards. Is it a power board?
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://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
Testimonial: "Hello The Knight. I wasnt able to find anything TV Insignia related on that website that you showed me. not even list of general error codes for Insignia TVs family. Do you have any other ideas where it is possible to see what exactly went wrong? Thanks Alex"
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