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TV has power, but no video

So I am trying to troubleshoot a insignia tv. There is no video, the screen stays black. When I turn the tv on or off the light on the tv changes, so there is power. I also tested the cables on the boards and they all have power going to them. There is three boards, one that is power and the ac adapter plugs into, the other one is where the hdmi Cable and other cables plug into, and the last one plugs into the screen.

How do I yroubleshoot the tv and figure out which board is bad or if it is the screen?

If there is any other information you need please let me know

Answer this question I have this problem too

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I did use a multimeter and test the power on the boards and there is power on the tv and to every board. You are saying the LED board, which board is that? Is thag the board thag plugs into the screen?

Also, is there are way to verify that this is the problem? Or if it is the screen itself?

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Ok, my issue is similar........I have no picture but perfect sound........Mary

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I purchased a new LED board (I think that is the one, it has all of the plugins like HDMI) and installed it and there still wasn't a picture. I have a new power supply board on its way and a new T-CON board on its way just in case. Will update you guys and let you know!

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hey did the new power suppy board work for your tv? i am having the same problem with my insignia right now. black screen but perfect sound... i think its the led driver/power supply.. im not sure tho? anything work for anyone else?

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I had the same issue and just finished fixing it. There was one LED out of 66 in the back-lighting that was bad and caused all the backlights to go out. I was able to find a replacement back-light strip on Ebay for $20 and installed it myself, now the TV works good as new.

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Jetlabb Electronics most common prblem with those is the power supply /LED board. A failure in that board would cause issues like you described. Replacement cost is around $70USD

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I did use a multimeter and test the power on the boards and there is power on the tv and to every board. You are saying the LED board, which board is that? Is thag the board thag plugs into the screen?

Also, is there are way to verify that this is the problem? Or if it is the screen itself?

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It could be the LCD screen itself, hoperfully not. The LED board is the power board. You may get power to it but you have to check the caps with an capacitance tester and you need to check the power transistor. I am trying to find some schematics for your TV.

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Can't I just test a capacitor with a multimeter rather than a capacitance tester? I do not have one of those!

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http://www.ebay.com/itm/Insignia-NS-50D5...

^^ That is the board that connects to the monitor. They call it a TCon board i guess. That is the one I am questioning. Is that the board that normally goes? Or is it the main board?

I can take a picture of the guts of the tv if needed. Thanks for your help by the way

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The symptoms you describe do not find a failed tcon board. It sounds more like the power/led board not supplying the power to the backlight. No you really cannot reliably test a capacitor with a multimeter.

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Ok people, it is more than likely a bad LED but if not then it will be the power supply! If you have never repaired a LCD television then I do NOT recommend you checking the LED panel strips yourself because you to remove the LCD panel and it is extremely fragile! If you break the LCD panel then just throw the tv away because it cost almost as much as a new tv just for the LCD panel! The easiest test is to check the 2 wires (red/white) for continuity and if there is none then you have a bad led strip!

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My recommendation is , that TV's are getting cheep these days! Do not work on any TV's and recycle them immediately and buy a new one!

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I just repaired a 55 inch insignia tv by replacing the led strips. I had a very dim picture but I had sound.

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Check for swollen capasitiors on the main board that can cause so the screen stays black even when turning it on.

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The LED panel ,which are the rows of LED Light Strips and are hidden in the case behind the main board are burnt and needed to be replaced and a certified Technician , or someone with the Electronics knowledge must work on the TV to repair it!

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I read that theres a defect in the power supplies with bad soldering.

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Jetlabb Electronics will be eternally grateful.
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