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    #1

    Samsung LE40R81B and clicking

    Hi,
    I know there are several posts on Samsung and bad caps, but I am a bit stuck now. My TV stopped powering on, just kept on flashing the red diode 5-6 times before clicking, then repeated flashing 3 times before a new clicking sound. So I opened it up and found two bad caps, one leaking a bit the other just bulging. As suspected, crappy caps from Samwha, 2200 uF. I ordered new Rubycon caps and at the same time got some 1000 uF as replacement for the ones that looked fine.
    After replacing the two, I still had the same symptoms. Then I tried holding the power button on the TV (the touch button) in for 10-15 seconds. That stopped the flashing and actually started the TV. I haven't tested it over time, just saw a clear good picture with sound and all.

    I opened it up again, replaced two more blue 1000 uF Samwha caps - I actually ordered one cap to few But still no luck.

    The remaining one was a 10v, so I decided to temporary try to use the 1000 uF 25v I pulled out (yes, I know, bad thing to recycle this crap, but it still looked OK), but still the same. And just like earlier, I am able to turn the TV on by holding the power button in for a while.

    What should be my next move? There are other smaller and more odd looking caps around there, but from an non-expert view, they look OK.
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    #2
    Re: Samsung LE40R81B and clicking

    1) Capacitors die from age, heat, and shoddy build quality. Capacitors DO NOT have to be visibly bloated in order to bad. They can be out of tolerance uF (a 1000uF measures 20uF) and/or have high ESR (ohm). A multimeter will be insufficient to test for ESR. For that you need an ESR tester which costs between $50 and $300.

    2) We normally request clear focused pictures like the following

    https://www.badcaps.net/forum/showpo...94&postcount=1

    showing all boards (and their relationship to each other) and then each board individally. See my sig file below how to attach pics and do's and don'ts.
    --- begin sig file ---

    If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

    Please do not post inline and offsite as they slow down the loading of pages.

    --- end sig file ---

    Comment

      #3
      Re: Samsung LE40R81B and clicking

      Sorry for the picture quality, rather crappy. The last attachment (bilde1) should have been the first. In the upper right corner you can see the two blown caps. The third attachment is after I have changed the caps. The fifth is a closeup of where I did the soldering.

      This is what I changed from and to:
      CM853 and CM852: 2200uF 10v => 2200uF 16v
      CM876 and CM880: 1000uF 25v => 1000uF 35v

      CB850 is the one I tried replacing with a used cap, just to see.

      If the soldering job I did was poor, would I still be able to force on the TV (holding the power button)? I will have to get a replacement for the last cap, but I fear that something else is causing the problem.
      Attached Files

      Comment

        #4
        Re: Samsung LE40R81B and clicking

        Originally posted by Robanoz View Post
        My TV stopped powering on, just kept on flashing the red diode 5-6 times before clicking, then repeated flashing 3 times before a new clicking sound.
        Use IE8 and goto

        http://elektrotanya.com/

        to download the service manual to check for the blinking codes. Also, do you have a multimeter?

        edit: We also need a picture of the main board (where the inputs are).
        Last edited by retiredcaps; 06-08-2011, 04:50 PM.
        --- begin sig file ---

        If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

        We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

        Please do not post inline and offsite as they slow down the loading of pages.

        --- end sig file ---

        Comment

          #5
          Re: Samsung LE40R81B and clicking

          I have now also tried replacing CB850 with a new one, but no luck. I am thinking of replacing the other 47uF 50V caps in the same area - not sure if any of them can be bad or if they have anything related to the symptoms with the click and blinking cycling. The ones I plan to change are CM851, CM854 and CM881 in addition to CB851 which is 10uF 50V.

          As you instructed, I have downloaded the manual (two different ones). And I did buy a multimeter the other day, but I am not very skilled at using it.

          On a different note, considering the Rubycon caps I bought, what is the likelihood that one of them can be bad from production or that I have somehow damaged it when while replacing it. I did try to use the multimeter on both ohm setting and uF to test the Samwha caps and also the new caps to see if I could spot any different, without making much sense out of it.

          I attached two shots of the main board.
          Attached Files

          Comment

            #6
            Re: Samsung LE40R81B and clicking

            I've had several LE40R86 and LE40R88, after standard cap failure doesn't come on due to problems in mainboard (the one with all the A/V connectors on).
            I've verified that the repaired powersupply is working, by swapping in another working set. Also tried another working powersupply together with the mainboard in the failing set, this gives the same results.
            So my conclusion is that something bad happens to the mainboard when operating the tv with bad capacitors, like memory locations getting corrupt, firmware problems, and so on.
            So I'm afraid this might be the problem with your set aswell.
            I've two units which I cannot bring to life after cap replacements, which I then think is the mainboards is now out of order.

            Comment

              #7
              Re: Samsung LE40R81B and clicking

              But if the main board is bad, would I be able to force the TV on by holding the power button in for 15 seconds? As if the cycle it does to try to "warm up" the TV or what it does that for, is not enough. I just hold that little touch button on the TV in and then it eventually comes on as if nothing is wrong.

              Comment

                #8
                Re: Samsung LE40R81B and clicking

                I've had the same experience as you, when constantly pressing the power button, at a constant rate, it *might* start up, then I enter the service menu and some of the pages appears corrupt.
                For example, in one of my sets, the lines containing the panel vendor and panel size was corrupt, some lines contained weird letters and selections not related to the relavant feature.

                Comment

                  #9
                  Re: Samsung LE40R81B and clicking

                  There is a link that caught my attention, here, suggesting to change the eeprom after replacing caps if stuck in standby mode. I am not sure if I would consider it stuck in standby, since it is cycling. But I am wondering if this could be it..

                  Comment

                    #10
                    Re: Samsung LE40R81B and clicking

                    This is interesting. I've tried to find such information, without luck. It might be the case, if replacing the eeprom the processor will program it to factory defaults. Really worth a try!

                    Comment

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