Question about Samsung LN-S4051D 40 in. LCD Television

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Samsung TV won't turn on- trying to fix it. A challenging problem

Gurus, help needed on fixing a Samsung LCD TV (LN-S4051D). The 1.5 year old TV won’t turn on. There is no picture or sound. When plugged in, a click sound was first heard followed by the red LED light blinking 4 times (next to the power button on the panel). Then the click sound came back again with 4 blinks of the LED light. The whole thing went into a cycle while the power button on the panel and the remote are not functioning.

I did some research and followed the suggestions on a “similar” problem brought on this forum. I replaced the IP board (power board) with a new one. The problem still existed. Then I checked all the capacitors on the PCB board (the main board) and found no blown ones. My question is that what is the real problem of the TV, and if it’s worth to spend another 300 dollars to replace the PCB board. (I already spent over 100 bulks on a new IP board). BTW, the TV cost me 1300 dollars when I bought it. Thank you all,

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  • Anonymous Jun 23, 2008

    I have the same problem. Anyone knows how to fix it?

  • aurelius1 Aug 06, 2008

    Same deal with my 4051D, it clicks intermittently while plugged in. Does not respond to remote control other than to make more clicking sounds when certain buttons are pressed .. strange.
    Please e-mail solution or advice to me.

  • Anonymous Aug 27, 2008

    I have exactly the same problem that was reported by xiangr on Jun 17, 2008. Same make, same model, 1.5 yrs old, four blinks cycling over and over again but TV never comes on. Our problem started on August 17, 2008. Have not tried anything other than internet to see if there are similar problems

  • Anonymous Sep 01, 2008

    I actually have the same exact problem, I've been reading and there is no other way than replacing the main board. Anyways, since the TV is 1.5 years old, Samsung won't honor warranty.. we should fight it together, this is an actual recall there is no way this is happening and none of us do nothing....



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SOURCE: Samsung TV won't turn on- trying to fix it. A challenging problem

I had the same problem. I live in NJ and called the local authorized "service provide" listed on the Samsung website. What a joke. Quoted $350 just to show up, never showed up. So I opened my own TV. Took off the plastic back (10 screws) took off the large metal RF shield (12-14 screws) and noticed a blown component. The markings on the component were KL15L and it is apparently an NTC Thermistor. Obviously it got fried and not knowing if there was other damage I decided to set out to replace the entire Power PCB Board Assembly and not the component. There were two part numbers on the assembled board (BN97-00457E & BN94-00622E). After searching online I also found a suitable replacement number for these (BN96-04896A). I found two places who claimed to have the part or have it on order ( and After placing orders with both and having neither come through, I broadened my search and found out that the LNR409D was basically the same model as my LNR408D so I looked for its Power PCB Board Assembly part number which turned out to be BN41-00521B. Google search for that part number showed the item available on ebay. I bought it a week ago (ebay 260311519904) for $144 plus $12 shipping. I removed the bad board an hour ago (6 screws about 7 connectors) installed the new one, plugged in the connectors, replaced the covers, plugged in the TV... AND IT WORKS!
Suggestion: If your TV is out of warranty then open it up (what have you got to lose) and see if the problem is obvious and maybe something you can fix (replace) yourself. The parts, spare boards, etc. are out there if you look.

Posted on Nov 16, 2008


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A Replacement Power Supply.

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3 faulty interface processing board(s) (signal switching)

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5 Bad LCD driver circuit, or faulty LCD panel its self.

6 faulty scan circuits.

To diagnose and solve these particular circuit scenarios require a professional service technician. Any of the problems above would take around 35 minutes and 100 bucks to repair at a service center.

But if you insist on fixing it yourself I can try to help you determine which board is possibly defective. I do have schematics for this chassis. If you have a multi-meter and 5mhz oscilloscope we can get started. These are the 2 instruments needed to check for critical waveforms and voltages according to the schematic data. It could be any circuit in the tv causing this condition.

The components on the circuit boards that could be defective are as follows:

Crystal oscillators
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Modular causes to this condition may be:

poor resistance too ground
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over current
under current
shorted switch actuation


Software related blink intervals:

Parental locks
Sleep mode
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"though if in this blink category the tv should come on requiring password. So this is unlikely....

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