Ir para o conteúdo principal

Repair guides and support for your Samsung TV.

2210 Perguntas Visualizar todos

Screen flickers on and off on samsung TV even after replacing main boa

Hello!

This concerns a Samsung un55ks800df 55in TV, not the one that ifixit let me choose. I also had a post that I marked solved because I thought we’d figured out the problem. You can find that here: Screen doesn't power on, flickers on and off, is it possible to repair

However I just changed out the mainboard with the other one I received and the problem still persists. Would that suggest the power board or the backlight perhaps? Is this still fixable maybe? I appreciate anyone who can help!

Responder a esta pergunta Também tenho esse problema

Esta pergunta é pertinente?

Pontuação 0

Comentários:

@johndough12 the backlights stayed on when you separated the main board from the power board? If they stayed on they are ruled out as a cause for this. Can you describe the "flickering" a bit better? Maybe post a quick video? Actually just realized its the same TV. Same backlight turning on then off?

por

@oldturkey03 hey thanks again for chiming in on this. I went ahead and made some youtube videos:

https://youtu.be/Ds01wBAxPxI

This one shows what happens when you unplug while it's doing the flashing thing. It appears now that not every time I turn it on does it cycle on and off repeatedly but after a couple or three tries it gets stuck in the loop

This is the second one: https://www.youtube.com/watch?v=inFTqeli...

This demonstrates what happens when I plug it back in - it also makes a buzzing sound at the end of each cycle. I can try to further isolate exactly which component that is coming from if you need me to.

Let me know if you need anything else and thanks again!

por

@johndough12 okay so in video two what happens when you disconnect the main board? Does the backlight turn on and stay on? If it does not it's your backlight/power board. Measure the DC voltage on the backlight LED output on thew power board. The buzzing sound should come from the power board

por

@oldturkey03 So the first video shows what happens when I disconnect the the main board from the power board - the backlight stops flickering and stays lit.

Which one is the backlight LED output on the power board? Is it the cable on the right side of the power board going to the right side of the TV?

por

Connector CNL801 is the backlight connector. Interestingly enough so is that your backlight stays on which in general means that the power supply does what it is supposed to do, turns the backlight on. It is the main board that usually tells the power board when to turn it on. Since you separated those two the power board keeps the light lit. I'll double check the T-con board and the panel itself and see if there are some connections to possibly causing errors like this. Any chance you can post an image of the label about the make and model of the panel? Should be adhere on the metal chassis

por

Mostrar mais 6 comentários

Adicionar um comentário

2 respostas

@johndough12 that hot glue to stabilize the heavier ones while in motion. Can you get better pictures of the following?

Block Image

Block Image

Esta resposta foi útil?

Pontuação 0

Comentários:

@stressmaster

I got some more pics for you; they can be found at:

https://imgur.com/a/GWGDTI9

I saw what you circled in blue - it sort of looks like a pin is missing from that chip but try as I might I'm not sure I was able to get a much better image. My phone doesn't do macro shots and I couldn't get it to focus at close range. All but the 1st pic is at 108 megapixels though so with that resolution you should be able to zoom a bit at least.

Also, do you by any chance know how to insert an image into a comment so I don't have to keep doing the imgur links?

por

@johndough12 to do macro shots digital zoom in from farther away just a fyi. As for image I'll have to edit this post so a second.

por

[image|2561775]

[image|2561773]

[image|2561774]

After u upload them click and it will add [image|♤♤♤♤♤♤] to text and after you post it shows a image

por

@johndough12 as for the chip which is a voltage step down ic2302 is original one missing?

por

@johndough12 basically we are trying to find a broken solder or loose pin but you very clode at those resistors & also bolt test them & ohm them. Some look upside down which is fine but if they are all the same than they should read identical

por

Mostrar mais 3 comentários

Adicionar um comentário

Block Image

Start for adding image

Esta resposta foi útil?

Pontuação 0
Adicionar um comentário

Adicionar a sua resposta

John Dough será eternamente grato(a).
Exibir estatísticas:

Últimas 24 horas: 0

Últimos 7 dias: 3

Últimos 30 dias: 21

Duração total: 114