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    #1

    Samsung LCD will not power on!

    I have a Samsung LN40C630k that worked great until one night while watching tv it just died. The Standby light is on, but no picture or sound. Any ideas for a fix? Is it the power supply board or main board or possibly a fuse? The set is a month away from being two years old. Thanks for the help!
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    #2
    Re: Samsung LCD will not power on!

    Originally posted by Pdn1030W View Post
    I have a Samsung LN40C630k that worked great until one night while watching tv it just died. The Standby light is on, but no picture or sound. Any ideas for a fix? Is it the power supply board or main board or possibly a fuse? The set is a month away from being two years old. Thanks for the help!
    Pictures please , give us half a chance to help you mate...

    Comment

      #3
      Re: Samsung LCD will not power on!

      There should be a fuse or possibly two fuses on the power board, main board TCon and Inverter boards. If you will take the back off the tv and take a picture with all boards hooked up and then one of each board individually back and front. Post them with the attachments section under Go Advanced under the Quick Reply box. Someone will try and help. It would also be good for you to list your experience with repairs of this type if any. Also what type of equipment you have multimeter, soldering irons etc.

      If you know how to test with a mulitimeter put the meter in the ohms setting and check across each fuse and your reading should be around 0.1 or 0.2 ohms for a good fuse. Over 1 ohm the fuse needs to be replaced.

      Make sure the picture size is 2000 x 2000 or less.
      Have you ever stopped to think and then forget to start thinking again?

      As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."

      Comment

        #4
        Re: Samsung LCD will not power on!

        I have a 46 in Samsung that I got for 50 dollars, that the fuse on the T-Con board caused that.

        Comment

          #5
          Re: Samsung LCD will not power on!

          Can you see any backlights? Look at the screen in the dark room to see if it has any glow.
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

            #6
            Re: Samsung LCD will not power on!

            Thanks again for all the replies... I am about to take pics now. I read somewhere about unplugging the power supply board from the main board and seeing if the backlight comes on and that will help with identifying the problem.

            Just did it and the backlight did come on.

            Taking pics now....thanks again!

            Comment

              #7
              Re: Samsung LCD will not power on!

              ok, here are pics..... the caps do not look bad.

              hope the pics are ok... cam is old.
              Attached Files

              Comment

                #8
                Re: Samsung LCD will not power on!

                On the left side of the power supply/inverter combo board just above the connector with black wires, there is a label telling us what the pins are for, the picture is not in focus to be able to read. Can you post better pictures that are in focus? we need to be able to read and see what are on the boards
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                  #9
                  Re: Samsung LCD will not power on!

                  Do you have a multimeter and do you know how to take DC voltage readings? If yes, measure all the voltages on CN802.

                  BTW, we are going to need clear focused pictures of the top left hand corner of the power supply so we can see the legend.

                  edit: budm beat again me while I was trying to read those out of focus pictures.
                  --- 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

                    #10
                    Re: Samsung LCD will not power on!

                    ok, so sorry for the bad pics...I do not have a multimeter, soldering gun, or ever used either. Will be working on that. It seems my camera is not quite good enough to get the legend in focus. working on that also

                    Comment

                      #11
                      Re: Samsung LCD will not power on!

                      is it possible to type out the legend? not able to get my cam to focus on it

                      Comment

                        #12
                        Re: Samsung LCD will not power on!

                        Originally posted by Pdn1030W View Post
                        is it possible to type out the legend?
                        Yes, you can, but without a multimeter to take readings, it is pointless.

                        You will have to borrow one from someone.
                        --- 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

                          #13
                          Re: Samsung LCD will not power on!

                          ok, thank you for replying. Let me ask if you think the main board or power supply board is bad? I was thinking if the power supply board went bad then it would be a cheap easy fix.

                          Comment

                            #14
                            Re: Samsung LCD will not power on!

                            shopjimmy.com seems to be out of stock of the mainboard I need...anyone know of anywhere else to get the parts?

                            Comment

                              #15
                              Re: Samsung LCD will not power on!

                              Just wanted to update the status of this post. Turns out the problem was the main board. I ordered the repair kit from shopjimmy.com, (seemed like such a better deal than ordering just one part, and was in stock) replaced the main board and five minutes later the TV was up and running. My next objective is to learn how to use the equipment needed to test and repair the old main board. Thanks all for the assistance!

                              Comment

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