Question about Samsung Televison & Video

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Problem with Samsung LN46A550P3FXZA.

My television is a Samsung LN46A550P3FXZA. My problem is that I get no picture and no sound. However, the (white) lamp at the bottom of the television is lit and the small red LED (I think that what you call it) constantly flashes. Also every 20+ seconds I hear clicking ''cli-Click.'' This is what it looks like: I was advised that the problem may have been the power supply board. I was able to purchase one and replace the one that was inside my tv. It worked, but after a few days while I was watching tv, the picture & sound went out and some red dots flashed on my screen and the problem of no picture, no sound, flashing red light, and the click came back.

Thinking that it was just another bad power supply, I ordered another one...but THAT didn't work.

Can someone tell me that the problem is something other then the power supply? Here is what my television looks like in the back. ( ) Could something be ruining the power supply?

Please keep in mind that I know nothing about televisions, so feel free to ''teach'' me about this if necessary.

Posted by on

  • Vtorch May 28, 2010

    I would just like to read a second opinion.

  • Vtorch May 29, 2010

    Would like another opinion



3 Answers

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Here are some tools that you may need :

How to test for Continuity

How to use a multimeter

of course with a service manual like one of these:

snapshot on the page:

Problem with Samsung LN46A550P3FXZA. - 860e7e1.jpg

or these one :

SAMSUNG LN40A530P1FXZA, LN46A530P1FXZA, LN52A530P1FXZA Chassis GPR40MUS, GPR46MUS, GPR52MUS Direct Download! (Pdf, 27 MB)


there could be other web sites for your service manual

With the tools above , there might be a chance to have it working

only with the aid of the service manual.

Since you have also replaced the power board , have a visual

check on the 1000 uF capacitor on the former board.

Check for Va and Vs

All voltages must conforms to the Service Manual Specifications

Procedures are stated on the service manual.

Although , these symptoms can be also caused by these board

But most often on the Power Board.


Hope these helps



Posted on May 29, 2010

  • 2 more comments 
  • Rommel Cana
    Rommel Cana May 29, 2010

    Please note that if your TV denies to work ,

    it can be a result
    of working power supply!

    Power supply (SMPS in technical
    term) has 2 main functions :

    1- Producing the needed voltages and
    supplying them to different stages.

    2- Protection and monitoring
    for unwanted situations like short circuit ,

    over/under voltage
    , over current , thermal problems and ...

    In all of the
    above situations , SMPS cuts all or some of its outputs

    preventing further damages.

    You can recognize this using
    some symptoms like click sounds ,

    flashing standby LED , number
    of clicks and flashes

    and some simple tests.

    Replacing the Power Board is a good idea, but it does not necessarily mean that it will work,

    due to mismatch voltages , values that are critical in operation of the Unit as a whole.

    On some sets , required voltages are printed on a sticker on the chassis.

    All are based on voltages reading and the proper oscillation of each circuit.

  • Rommel Cana
    Rommel Cana May 31, 2010

    additional troubleshooting guide :

    these troubleshooting guide is from other Samsung LCD Model , Hope these applies to

    your unit.( same principle involve ).

  • Rommel Cana
    Rommel Cana May 31, 2010

    here are some of the waveforms that you can see on the scope

  • Rommel Cana
    Rommel Cana May 31, 2010

    * FRCM: Micronas FRC chip


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Have you checked all the parts on the mainboard? could be somethingnot feeding right and killing the power supply??also, how is the electricity in your area? you can use a meter to check it. I have a lot of problems with power spikes where I live and its killed a dvd player a few years back.

Let me know and I will respond with any info I can.

Posted on May 28, 2010

  • Vtorch May 28, 2010

    I do not know how to check all the part of the main board. What do I look for?

    Can you tell me, why it could be the main board and how it could damage the power supply?

    The reason I ask, is that a Samsung technician pointed out to me that the problem was the main board and he wanted to charge me a total of $500 to replace it. So (what I did was) I went and bought a main board myself online and replaced the original one. The problem still existed. So I took out the "new main" board and put back the original one. Then (under advisement) I bought a new Power Supply to replace the original one. That worked, but for about 10 hours or so then the tv went out just as I described. Thinking that I just got a bad Power Supply Board, I bought another one and the problem still exists. I even connected, at the same time, the new power supply board with the new main board and the problem still exists.

    The weather in my area is pretty good as a matter of fact the problem with my television occurred just when I was watching a tv show during a bright sunny day.

    Could the problem be anything else on the tv besides the power supply board or the main board? In case you didn't see, here is what my tv looks like in the back: click here


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Thanks for using FixYa. To start with check the lamp if that’s working fine, you can also take the lamp cover off from the back then take the lamp out and try to reset the lamp door switch and then put the lamp back in. After this if still the issue is not resolved then check the ballast which is the power source for the lamp and if you also hear a loud whine like sound then it means that the color wheel has gone bad and needs to be replaced. If the lamp seems to be working fine then it’s the DMD Board that needs to be replaced.
Please do accept the solution if the issue is resolved or post a comment for further assistance.


Posted on May 28, 2010

  • Rylee Smith
    Rylee Smith May 28, 2010

    Second opinion will be to check and replace the digital board.


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