TV has power, but no video

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Insignia ns-50D550na15 LCD TV

Jetlabb Electronics @jetlabbele61632

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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

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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?

Jetlabb Electronics 의 2016년 8월 14일

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

Mary Hedrick 의 2016년 8월 15일

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!

Jetlabb Electronics 의 2016년 8월 24일

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?

tonik128 의 2016년 9월 1일

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.

Bob Casabella 의 2017년 1월 16일

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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? — Jetlabb Electronics
Ok, my issue is similar........I have no picture but perfect sound........Mary — Mary Hedrick
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! — Jetlabb Electronics
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? — tonik128
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. — Bob Casabella

oldturkey03 @oldturkey03 평판: 812.7k 1.2k 920 2.4k · Answer 1 · 2016-08-13T21:26:45-07:00

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oldturkey03 @oldturkey03

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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?

Jetlabb Electronics 의 2016년 8월 14일

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.

oldturkey03 의 2016년 8월 14일

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

Jetlabb Electronics 의 2016년 8월 14일

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

Jetlabb Electronics 의 2016년 8월 14일

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.

oldturkey03 의 2016년 8월 14일

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Roman @theorman 평판: 13 1 · Answer 2 · 2017-10-18T10:33:01-07:00

Roman @theorman

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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!

Daryoush Namiranian 의 2019년 1월 20일

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Philip Bunn @philipbunn 평판: 13 1 · Answer 3 · 2019-03-27T15:44:36-07:00

Philip Bunn @philipbunn

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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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Jonny @ftw 평판: 377 5 4 · Answer 4 · 2017-12-07T04:39:51-07:00

Jonny @ftw

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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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Daryoush Namiranian @daryoushna75051 평판: 1 · Answer 5 · 2021-03-18T17:41:57-07:00

Daryoush Namiranian @daryoushna75051

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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.

Rickie Lowell Armstrong 의 2021년 11월 20일

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Insignia ns-50D550na15 LCD TV

TV has power, but no video

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