Question about Samsung LN-S4051D 40 in. LCD Television

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Tv wont turn on after replacing main board and power board

Replaced power and main board still wont turn on

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  • Baker TV Repair
    Baker TV Repair Apr 17, 2014

    Hi Santo Parrone, I want to help you with your problem, but I need more information from you. Can you please add details in the comment box? Please provide the model and serial # along with version of your tv. What was the original problem you were trying to correct?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 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

  • 1 Answer

SOURCE: I have a Samsung LNT4665FX with screen problems. I

To solve this type of problem, you need a piece of white chalk. Draw a line around the area where the set is at. Call a priest - and lay the poor thing to rest!!!! This isn't the first time Samsung has "dropped" junk onto its' customers. Their dvd players also had problems with their DSP I.C.s that would over heat and cause the video playbacks to "break up". Don't waste any more time or money on the product!!!!!

Posted on May 18, 2010

  • 610 Answers

SOURCE: One day I turned my tv off and it wouldn't turn

The power board is the usual culprit but I have also seen the main board, T/Con board or the panel itself cause this problem. I would recomend calling a trained tech to figure out the problem. You could spend hundreds of dollars on parts and still not fix it. You can call 1-800-samsung to find nearest service center.

Posted on May 21, 2010

apkb29
  • 174 Answers

SOURCE: Toshiba 55SL412U Sound but no picture

Do not replace the board, repair the problem.

Posted on Jul 23, 2012

vinceisaac
  • 2432 Answers

SOURCE: Samsung TV goes Black but keeps sound

you will need to check weather the 24vdc supply for the inverter board is good no drop voltage. if no supply check the power supply board. then you should check if their is a inv_on signal at the power inverter board around 3v-4.4vdc . if goes out during power on tried to disconnect the supply going to the inverter board to ensure if their is a shorted parts in the inverter board. if the inverter_on signal also goes out even with out inverter board connected that was mean you have problem in the processor board.

Posted on Nov 02, 2012

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The main board sends the on/off signals to the power supply board. You need a new main board. You can get it from here: TV Parts Universal TV Stands DLP Chips ShopJimmy

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Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

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1 Answer

Replaced power supply board but tv still wont turn on


Hi, You might also look at the capacitors on the main power board they are the first to go (Bad) Look for bulged caps and or leaking.
Replace them with same ratings. Good luck

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1 Answer

Emerson tv wont turn on


Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time.

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I had the same problem. The power supply board is bad and this is very common with this TV. I ordered a new power board from shopjimmy.com. The cost is $51.00 with shipping. Just open the back of the tv and you'll see the part number on the circuit board. It's easier to replace the whole board. You can also go on UTube and see a video on replacing the board. Very easy to do yourself. My tv hasn't had a problem since I replaced this board.

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1 Answer

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Are you certain the replacement power supply is good? A defective main board or power supply can cause this problem.

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1 Answer

I have a vizio tv and it wont turn on it showed the vizio logo and now it wont turn on and its been like this for 2 days


The main board will need replacement. Its very common issue where the set will freeze at the vizio kogo then eventually it wont turn the logo from orange to white so it can power up. Replacing the main board should solve the issue. You can get the replacement main board from www.tvcircuitboards.com

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The power supply get's it "turn on" signal from the main board. It is very likely you have a faulty main board. Do you have electronics experience??

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1 Answer

I have a samsung ln-t4053h that had a bad caps. I replaced the caps and the tv turned on fine and i put a flashlight to the screen and the screen turns on but the backlight is on 10 and it looks like its...


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.
http://electronicshelponline.blogspot.com/
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.

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