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It sounds like your LCD panel or your T-con board is bad . Panels are expensive so I would replace the T-con board first. You have to open the TV and get the part number from the actual board in order to find the correct one. You can find parts at www.interliquidparts.com
The T-Con board have problems.Dying,or Lose or bad optic cable?That the board,that sit right in the middle of the bottom of the LCD screen panel. To control diffrent frequencies going to the LCD screen panel.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish T-Con board for the replacement.
Hi, the high pitched sound is coming from the coils or transformers on the power supply.
you can isolate the noise by removing the back and with the set on press gently with a plastic handle/item on each coil till you stop the noise. , you will probably have to replace the coil or the whole power supply, but sometimes you can tilt it over or secure it with silicone and it will stop rimging.
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Don't know if people are still having this issue or not but figured I'd post what i went through to help anyone that has. My LN-T3253H tv as out of warranty when I finally got around to calling Samsung. They flat out lied about the commonality of this problem and I convinced them to at least pay for any parts. Problem is the labor of a technician would be around $150. So, I bought the new power supply from Partstore.com for around $70. Just go to partstore.com and enter your model number and look for the power supply on the page. It took 3 days to get the part. It was very easy to replace. All you have to do take off the back cover of the tv (think there were around 12 screws all around the outside and one where the A/V connections are and pull off. Unhook the plugs going to the power supply and the four screws holding the board and then replace with the new board. So far, this fixed the issue. Keep your old board in case it starts happening again. You can probably have the old board repaired to fix the original problem since so many TV repair shops are aware of the issue. I am trying to find out from someone which specific capacitor or other piece is causing the issue and plan on fixing it myself. If and when I do, I will also post that.
Make sure you give Samsung a ton of grief when you speak to them and see if they lie to you also. I had just bought two of the new Samsung LED TV's for my media room. They work great but I returned both because of Samsung's refusal to fix my LN-T3253H and I will never, ever buy Samsung products again.
If this is for a universal remote, the different manufactures assign their own user code to set up their universal remote. They internaly convert to the proper protocol for the TV based on an internal software table.