Insignia TV, model NS-40D420NA16, Rev. B. Why can't it be turned on? resetting the power supply, but no help. Is there any way to diagnose whether the problem is in the power board or the main board?

SOURCE: I am looking for a

Its in stock here. But you may have to hurry. The part is out of stock neary everywhere else.
http://magictvparts.com/store/insignia-42/715t2830-2-2-main-unit/

The Knight

• 76851 Answers
• Posted on Jan 05, 2015

SOURCE: Replaced power supply board and main board on Element ELDFW462 TV.Now I have no power on TV.Can you help me?

Contact any service technician. This is not a service work; can be done with ease by a customer. Especially who is not aware in electronics. Gopakumar Gopalan Google

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The Knight

• 76851 Answers
• Posted on Feb 12, 2017

SOURCE: I have a 40inch insignia tv model NS-40D420NA16. It now turns off by itself and then comes back on after about 3 minutes. I've reset and the timer is off. Steve

The main power supply regulator section circuit fault. 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://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.

SOURCE: Having Back light issue with Insignia TV model NS-50D40SNA14. Can see picture faintly in darkened room and have sound.

Are you sure your meter is accurate? Chances are the set wouldn't power up at all with only 4 volt standby, as it takes 5 volts for the processor to work that turns the set on. Try testing the meter on a car battery and see if you get about 12.5 volts without it running

Testimonial: "You were correct. I believe meter is defective. It is a cheap clamp type and I see no calibration for it. New meter in near future. Then back to drawing board. Thanks for the help!"