Insignia LED TV NS-24E730A12 won't turn on. Power LED is not lit, neither red nor blue. Will it be a power supply or main board problem?

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. Pull up older posts.
http://electro-medical.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.

Its the board that controls the screen. It has a flat ribbon cable going to the bottom of the screen. You can find the parts you need at shopjimmy's web site.

check if there is a secondary board check out the capacitors if they look inflated the are probably blown replace the with exact uf and voltage and it should switch on

ok, when you plug in the set, does the power light come on? Assuming you ordered a power supply in good working order, you may very well have a faulty main board. The power supply produces standby power that the main board uses to power the standby/power on light. Your main board also uses the standby power to provide the "ON" signal to turn on the rest of the power supply.

THE MAIN BOARD, usually is a 3vdc-3.3vdc signal to turn on the power supply

Check the fuses on the power supply board first. They usually blow when you get a power surge. You may be able to replace them and get the TV running for a few dollars. If the fuses are good then the power supply board will be the issue. The main board should not be damaged because the surge has to go through the power supply board first.

let the power supply discharge..for an hours..


Please take this steps on how to determine the problem:
1. Open the back cover.
2. Check the power supply output...It should have 5vdc for the main board..12vdc or 16vdc for the audio and 24vdc for the back-light inverter..
3. If those 3 voltage supplies have encountered voltage drop...The problem could be on power supply board..
4. If the power supply output is normal..The problem could be on the main board...
5. If the problem is power supply you should check if the capacitors are bulged on the top and try to replaced it..If you can't do that you can purchased new power supply board..
6. If the problem is on main board there is no D.I.Y repair on that so you need to buy a new main board that fits to your TV..
Hope this solution will be helpful..

You need to check the 12 or 24v source coming from the power supply to the inverter board, that's the board usually to the left and rather tall. Get your meter set, then turn the set on and see what happens, if the voltage comes up and then shuts down, you'll need to pull the plug for the inverter and measure the voltage again. If it stays up you have a bad converter board, if not then it's in the power supply, that's good old fashion trouble shooting from there on.

I unscrewed all the screws in the back, detached the tv from the base, and was able to get the back off. I ordered a new power supply board and will install it to see if it fixes the problem with the tv (won't turn on, insignia light alternates between red and blue). I didn't notice any problems with "swollen" capacitors, so if the new power board fixes the problem I'll update this website.