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Samsung LNT4665FX 46in flat screen LCD power supply cycles on/off, with audible que. Blue light at bottom of screen remains lit, but screen remains black. Does not respond to manual on/off or remote control on/off. Disconnected from power source for approx. 10 mins. Power supply energizes and blue light comes without aid of manual on/off switch and TV begins to cycle on/off again as before.

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Check out the fixYa solution for the Samsung LNS4051D- it sounds like the same problem. Defective capacitors. You may need different part though.  We just fixed my mom's LNS4051D with that problem. I have the LNT4665 and although it hasn't failed yet, I am tempted to get some capacitors just in case.

Posted on May 18, 2009

IF I CRACKED THE FRONT OF MY LG HD 1080 FLATSCREEN..HOW MUCH WOULD IT BE TO FIX IT?OR SHOULD I JUST BUY A NEW ONE?

Posted on Nov 09, 2008

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Posted on Jan 02, 2017

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Samsung TV shutting off by itself and relays clicking


If you don't know what you're doing, don't open it up to fix it!
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Clicking noise can be coming from bad capacitors on the power supply board.



It's usually easier to just replace the power supply board.

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Hello Chuck,

Before you replace the capacitors on the power supply board you need to check with Samsung. Your TV model falls under the class action lawsuit settlement and Samsung has agree to repair any TVs with faulty capacitors on the power supply board that were affected. You can get full details on the settlement here:

http://www.ccl-la.com/blog/index.php/samsung-has-reached-a-settlement-in-class-action-lawsuit-over-faulty-tv-power-supplies/

This settlement covers any listed unit for 18months starting Mar 2 2012.

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I have a 46in. Samsung LCD TV. It worked lastnight now I tryed to turn it back on and all it does is the power light flashes and it make's a clicking sound can you help thank's very much.


The clicking noise indicates that its a power supply related issue. When the relay switches turn themselves off you will hear that sound. The first thing you should try is to unplug the set and hold for 5 minutes before plugging it back in and turning it on? Why? Because a power surge may have triggered these relays and unplugging them will reset them so that you can see if the set turns on. Otherwise we will proceed accordingly and troubleshoot the components provided you can follow a schematic.

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Sounds like the power supply board has failed, VERY common problem. You can call 1-800-samsung for the nearest service center.

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Have you ssen the back light lit up? If not, the power supply may have problem. If it has back light, then the suspection are the main board, T-con and inverter. Those boards need checked to find out exact defective board.

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Bad power relay get it fixed before you have more issues the psu cost around $25 bucks on ebay good luck!

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