Question about Samsung LE-46A566 46 in. LCD TV

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Samsung LCD TV backlight switched off

When watching, the backlight simply switched off. Sound was still on, and also the LCD was working (just hard to see without backlight). I switched the TV off and on again, the backlight was working again for 10sec, then it switched off again. I switched the TV off and on again, the backlight was working again for 3sec, then it switched off again. Now the abcklight remains off. I checked the inside of the TV, but could not find anything which looks broken etc. Can share some pictures if helpful. Does anyone have an advice reg. what exactly is broken? Many thanks in advance!

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  • Samsung Master
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Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Posted on Apr 24, 2017


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Posted on Jan 02, 2017

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SOURCE: Broken Mirror

you need to see if the lens where the light comes out is scratched..
if it is then the picture will never be right until you replace for a cheap replacement mirror the picture might be watchable if it is a good quality mirror

Posted on Dec 01, 2007

  • 1139 Answers

SOURCE: samsung plasma ppm42s3 , picture wobbling,sometimes screen goes blank

Hello arunaik_6,

This looks as if a component has become thermally sensitive. The best way to find this is to use component cooling spray. It looks as if the problem is localized to the tuner section. Take the back off of the TV and turn the TV on, wait until the problem occurs and lightly spray the tuner section with the component cooling spray watch for any reaction, then if this does not work spray the Microprocessor and the LVDS section and watch for a reaction. The set should go back to normal when it does that section is the problem, try to localize the problem to one component. Then replace that component.

I hope this helps,

Thank you,


Posted on Dec 16, 2008

  • 718 Answers

SOURCE: how hard it is to replace by yourself main board Samsung LN-T4065

You need to do some more diagnosing of the problem. If you get sound and change channels take a bright flashlight and place it again the screen. Look for an image around the edge of the flashlight.
If you see an image that means the LCD controller board (TCON) is probably good.

The problem is probably one of three causes;
1) Inverter board is bad
2) CCFT (cold cathode fluorescent light) are bad.
3) Power to the inverter board is bad. You can also check the connectors.

Posted on Mar 30, 2009

  • 1810 Answers

SOURCE: Was watching TV and the picture just went black (still had sound)

eithor the flyback just craped out or the tube went
try turning up the flyback failing that call a service tech and ask for a quote
quote cose 30-50 bucks
atleast you will know forsurre if it's worth fixing

Posted on Aug 06, 2009

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SOURCE: My Samsung LN-S2651D has sound but no picture


Check with Samsung, this model should still be under the 3 year warranty. You are having a problem with the backlight power supply. You can look on the back of the unit for the manuf. date, if its less than 3 years then go to and process the online service request form.

I hope this helps,if so please rate our solution.

Corporate Computer

Posted on May 20, 2010

Testimonial: "Your suggestion sounds about right to me, though I'm no expert. I do have experience with bad caps in other equipment and am comfortable around circuit boards and soldering, etc., so I'll have a go at it. Might these be low-esr caps? Once again, thank you."

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Oct 28, 2012 | Samsung LE-46A566 46 in. LCD TV

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Samsung LCD TV backlight switched off

if your TV is LCD or LED you have a faulty inverter board just replace it and your TV works fine again..

If plasma you have faulty y-sustain.

Hope it helps,,don't forget to rate and write a testimonial

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