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samsung le37c630k1w standby lights but no power on

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    samsung le37c630k1w standby lights but no power on

    hi to all
    at first the problem of tv is has light on standby but if i press or fron the remote control or fron the power button to be on it retains on standby
    on the above tv i have download the service manual of power supply bn44-00339b from electrotanya
    when i remove the plug cn802 from mainboard i measure in pin 1,3,5,17 12.5 volt
    on pin 16 5.2 volt and on the pins
    11, 13, 14 4 volt maby i have problem here i think must be 5 volt right ?
    and on the plug cni801 i can measure on the pins 10 ...14 24 volt and the backlight is on normal
    but if i connect the mainboard with the plug cn802 the voltages on the pins 1,3,5,17 are not steady variable from 0 -12 volt the same happens and on the pins 11,13,14 variable from 0-4 volt
    can anybody tell me if the problem is on power supplu or mainboard ?
    thanks in advance
    Last edited by Xristakis795; 06-19-2022, 02:35 PM.

    #2
    Re: samsung le37c630k1w standby lights but no power on

    Looks like you may have a mainboard problem.
    I assume no responsibility for any stupid suggestions I might post.

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      #3
      Re: samsung le37c630k1w standby lights but no power on

      from your exprerience something is short on the minboard and causes this problem or the better is to find used mainboard from ebay ?
      and on the pins which must have 5 volt and measure 4 volt you thinks i havent problem ?

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        #4
        Re: samsung le37c630k1w standby lights but no power on

        check the voltage regulators on mainboard.
        Last edited by nomoresonys; 06-19-2022, 04:20 PM.

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          #5
          Re: samsung le37c630k1w standby lights but no power on

          did you try unhook the cable from mainboard to tcon, then see if those voltages are still unstable?

          Comment


            #6
            Re: samsung le37c630k1w standby lights but no power on

            yes sir i did this the same result
            you mean the regulators of the mainboard right ?
            i will measure and i will write about
            as about as the voltage of power supply instead 5 volt i have only 4 volt on the particular pins wich tell you above do you think is this the reason to cause the problem ?

            Comment


              #7
              Re: samsung le37c630k1w standby lights but no power on

              Missing PSon is most of the time a problem with the mainboard’s main IC. Nothing much you can do about it besides replacing either the board or the IC.

              Comment


                #8
                Re: samsung le37c630k1w standby lights but no power on

                for what particular ic do you mean sir ?
                and the voltages when the plug of power supply connected to the mainboard
                which variable from 0 - 12volt its not mean something like short on the main ?

                Comment


                  #9
                  Re: samsung le37c630k1w standby lights but no power on

                  voltage testing: https://www.youtube.com/watch?v=ocqnqmBxiqY

                  Comment


                    #10
                    Re: samsung le37c630k1w standby lights but no power on

                    thanks
                    i have seen this video
                    its very good

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