Question about Samsung Televison & Video

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Do I need a new T-Con board for my Samsung UN55JS700DFXZA ?

I bought a used Samsung UN55JS700DFXZA recently and when turned on it seems to work fine but makes an abnormal buzzing noise. I removed the back plastic cover and did some rudimentary testing and found that when the flat ribbon cable from the main board to the T-Con board (what I would consider the 'input' to the T-Con board) is disconnected the buzzing stops. But, if the input cable is connected and either or both of the 'output' ZIF cables (T-Con board to the screen) are disconnected it still buzzes.

Posted by Anonymous on

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Larry

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  • 3,898 Answers

Can you tell where the buzz is coming from? I think what may be happening is one of the PMW transformers on the power board is making the noise, when you unhook the LVDS cable (main to timing board) the load put on the power supply drops because the timing board uses a fair amount of power and the transformer(s) quit buzzing. It's very possible I'm wrong on this but I've seen this happen before. Another thing is you said the set works ok, if there was an issue with the tcon the set wouldn't work. Try to isolate the sound, if it's coming from the power board you could order a new one or just use it the way it is as it shouldn't hurt anything.

Posted on Dec 05, 2021

  • Anonymous Dec 05, 2021

    It's very hard to determine where the buzzing is coming from, it almost seems like some or all of the back light LEDs are buzzing, the noise is really spread out across the entire TV. Last week I found a T-Con board on ebay and swapped it out, no luck, still buzzes. The buzzing itself is at 120Hz, if that tells you anything.

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Samsung LN40A550 LCD TV

This is probably the LCD Controller (T-CON) board connections. This is a small board with 2 flat cables connected to it which run to the LCD screen. The connections with the flat ribbons needs to be reseated. The heat makes the connections misaligned. This board is usually covered by a metal shield.
When you reseat the connections, run the set for 15 minutes to see if it works before replacing the back cover. You may have to reseat it again.
Remember, handle electronics boards by the edges, no static electricity, and do not touch the connection contacts.
At worst you would need a new board. (Shopjimmy.com has it for ~$90.00usd)
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