Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Just FYI: I had a friend with an Insignia NS-32E570-A11 with a backlight problem, and it turned out to be one of the actual LEDs in the backlight array was burned out, causing some sort of over-voltage condition that made the backlight sometimes work, and sometimes just flicker for a moment at TV startup and then turn off. We took the panel apart and bypassed the one bad LED (it had a dark spot on it and failed continuity - you can test each LED with a continuity tester and see them light up!), and now the TV/backlight works! Be aware this is tricky bypassing the bad LED, as it is ultrasonically welded to the LED array strip (same technique used to make ICs), so you need to be a very good solderer to bypass it without it breaking the connection.
Back-light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.http://electronicshelponline.blogspot.com/
Try changing the input device to something you are sure works. Switch off TV manually, switch off power, remove plug and retry after 48 hours. If problem persists, please refer it to a qualified service technician.
You can just buy a new remote. Test it using the smartphone front camera trick. Or it is the television that has no signal, do a Power Reset. Pull the mains plug for 5 minutes. Press and hold the power button on the set for 1 minute. Plug back in. Also check the input leads on the back for whatever is supplying the signal, Cable, Satellite, OTA, then check the Source button on the remote.
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You can enable customize Parental Controls via your TV's on screen menu. If you have previously set a password, you will need to re-enter your password to begin. If you have forgotten your password, try 0000 (four zeros) or 3448 (the default password may vary by TV model, so consult your User Manual for details). You can find detailed instructions for using the parental controls in your TV User Manual, available for download at InsigniaProducts.com. Just search for your TV model number and click on the Support/Download tab. I hope this helps.
