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Repair guides and support for your Samsung TV.

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Why there are recurring horizontal lines on my screen.

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Samsung qled q7fna 55"

I've a Samsung q7 qled 55" and every time i turn it on, the whole screen fills up with moving horizontal lines. The lines keep flicking up and down the whole screen with all sort of colours and then after 15 to 20 minutes start disappearing from top to bottom. Its quite annoying and I've searched the internet, can't seem to find anything. I've swapped the TCON board the the results are the same so it's definitely not the TCON board, and oneconnect cable don't have any visible cracks or bending. Kindly help.

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[video|5422]

As you can see that the lines are horizontal and there is a visible difference between the quality of the image on left and right sides of the screen when lines do disappear, the right side is more vibrant than the left side.

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@kamranazam if the lines are up and down then those are vertical lines. Common issue is the main board as well as the ribbon cables (there is always a chance of a bad panel as well). Remove the cables and check for tears as well as corroded ends. If the cables are good, then consider replacing the main board. This "after 15 to 20 minutes start disappearing" is possibly due to solder joints closing and making contact. Check your board for cold solder joints. You identify those by the color of the joint. It should be shiny silver, if it is dull grey, resolder it.

Let's see what those lines look like. Post an image of what your screen shows as well as your boards. that way we can see what you see. Adding images to an existing question

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I've attached a video, kindly take a look.

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@kamranazam so you got vertical and horizontal anomalies. That is a tricky one. check the things I've mentioned in my answer. After that, you can always try a Tape-Off since this could actually be a screen error.

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Can't tape off because in this model there are only two connector ribbon cables going from screen to t-con board and yellow strips coming from the screen to the those two ribbons is one continuous web, so taping off does not work as one point in a ribbon cable is managing alot of horizontal lines on the screen.

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@kamranazam post some pictures with your question. Lets see what you got going on there.

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Can One connect box be the culprit? Because I've checked the cable and it's fine, there are no cold solder joints in the tv unit, the only thing that is left unchecked is the one connect box, any suggestions how to check the box for the specific fault?

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