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    Need Help! Samsung LCD TV LN46C630

    First post. Thanks for any help.

    My Samsung LCD TV LN46C630 is totally unresponsive. I don't even get a click.

    The standby light is on and will flicker a couple times if I try to turn the set on.

    Now I have to tell you that I have had the flicker problem for some time but I lived with it because I assumed it was due to the fact that my signal comes through a little WD converter box so I can watch Netflix on the TV. Temporarily I only have Internet and no cable TV. Bad assumption. Between Google and this Forum I see that I am far from alone in the flicker department.

    I have the back off and snipped JP852 while I was here according to some good info I found here. Of course that did not fix the problem of the set not turning on.

    I did call Samsung and the lady ran me through her flow chart and then decided I needed a tech to come out and it's a chargeable call. I said 'what about the 7 million tv's that are being fixed free because of factory defects ?" She said I didn't fall in that category because my set was newer that those. Right now I don't go back to work til July and $150 might as well be a million so here I am.

    I do not see any obviously swelled caps and both fuses on the mainboard check okay.

    I need some guidance for sure. I'm not a pro TV repairman but I'm a certified computer tech and I have repaired a couple crt's in my time and a few years back I built a Heathkit GR-2000. If you know what that is you've been around for a while like myself..

    #2
    Re: Need Help! Samsung LCD TV LN46C630

    Do you have a digital multimeter and digital camera?

    First, we need pictures of the chassis so we can see the layout and indicate where to make tests with your digital multimeter.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment


      #3
      Re: Need Help! Samsung LCD TV LN46C630

      Thank you tom66

      Here you go...
      Yes I have a multi-meter...

      There are only two boards. I took a few of each just to be thorough...
      [/URL][/IMG]

      [/URL][/IMG]

      [/URL][/IMG]

      [/URL][/IMG]

      [/URL][/IMG]

      [/URL][/IMG]

      [/URL][/IMG]

      [/URL][/IMG]

      Comment


        #4
        Re: Need Help! Samsung LCD TV LN46C630

        OK, the power supply/inverter board BN44-00341B has built-in pull up resistors for the PS_ON line and the BL_ON line, so if you disconnect the black cable between the power supply and the main board and then plug the TV into the outlet, the backlights should come on which means the power supply/inverter board is working. Try that and see what happen.
        SCH in PDF from TOM66.
        Attached Files
        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


          #5
          Re: Need Help! Samsung LCD TV LN46C630

          Originally posted by budm View Post
          OK, the power supply/inverter board BN44-00341B has built-in pull up resistors for the PS_ON line and the BL_ON line, so if you disconnect the black cable between the power supply and the main board and then plug the TV into the outlet, the backlights should come on which means the power supply/inverter board is working. Try that and see what happen.
          SCH in PDF from TOM66.
          Just to be sure... You mean the wire the green tape is pointing to?

          [/URL][/IMG]
          Last edited by chirp; 05-11-2013, 09:22 AM. Reason: added green tape

          Comment


            #6
            Re: Need Help! Samsung LCD TV LN46C630

            Yes, that one.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment


              #7
              Re: Need Help! Samsung LCD TV LN46C630

              Yes, the screen has a faint blue glow.

              Comment


                #8
                Re: Need Help! Samsung LCD TV LN46C630

                OK, your power supply is OK,
                Put the cable back in place, then remove the cable between the main board and the T-CON board your main board and see if you can turn on the TV and see if the backlights will come on. More likely to have bad main board.
                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: Need Help! Samsung LCD TV LN46C630

                  Originally posted by budm View Post
                  OK, your power supply is OK,
                  Put the cable back in place, then remove the cable between the main board and the T-CON board your main board and see if you can turn on the TV and see if the backlights will come on. More likely to have bad main board.
                  Just checking again... the red arrow?

                  [/URL][/IMG]

                  Comment


                    #10
                    Re: Need Help! Samsung LCD TV LN46C630

                    Correct
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment


                      #11
                      Re: Need Help! Samsung LCD TV LN46C630

                      Now it acts the same as it does whether it's plugged in or not. No activity except flashing stand-by light. No sound, pic, backlight. By 'plugged in' I mean the cable I just removed--not the a/c cable. Just wanted to clarify

                      Does this mean I need a main board?

                      Thanks for all your help!!!
                      Last edited by chirp; 05-11-2013, 05:47 PM. Reason: clarification

                      Comment


                        #12
                        Re: Need Help! Samsung LCD TV LN46C630

                        It indicates the T-con is not shorted. The problem is most likely on the main board; it's a common defect with these models.
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment


                          #13
                          Re: Need Help! Samsung LCD TV LN46C630

                          Originally posted by tom66 View Post
                          It indicates the T-con is not shorted. The problem is most likely on the main board; it's a common defect with these models.
                          One last question:

                          I did some research online and found my BN94-02701G for $224.00 from Samsungparts.com.

                          Is that my only option other than trashing it?

                          Thanks!

                          Comment


                            #14
                            Re: Need Help! Samsung LCD TV LN46C630

                            Buying it direct from Samsung or an as-new supplier will be very expensive, but the main boards for these TVs are rare anyway.

                            Shopjimmy are trusted and reputable. One of the few spares shops which actually appear to test their parts before sale. However, they appear out of stock at the moment. They accept returns.
                            http://www.shopjimmy.com/catalogsear...?q=BN94-02701G

                            Some suppliers on eBay have it around $70. When buying from eBay sellers ALWAYS make sure you get it from a seller that will accept returns. There are numerous reasons for this. Number one is about 5~10% of boards seem to be dud out-of-the-box, because despite their claims, very few if any test the boards. Secondly, there is a small chance the diagnosis is wrong and you do not want to be out $70+. Thirdly, there can be compatibility issues between some suffixes (see below.)
                            http://www.ebay.com/sch/i.html?_trks...at=0&_from=R40

                            Matching the suffix may be important. The major important factor is that both use the same LCD panel, and the input plate/size will fit (e.g. right number of HDMI ports.) The best way to verify this is ask the seller. A good seller will keep a record of the panel model the set was removed from. Failing that, we may be able to determine it from the T-con model (available by searching based on the TV model number the seller quotes.) If the T-con between donor and acceptor TV is the same, there is a good chance everything will work fine.

                            We still have not discovered what goes bad on these main boards; I wish there was a cheaper solution. I'm pretty sure it's related to the firmware getting corrupted, but I'm not sure how that can be flashed onto these sets again. Samsung's official policy is to simply switch the main board from what I've heard, so maybe it's not practical.
                            Last edited by tom66; 05-11-2013, 06:21 PM.
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment


                              #15
                              Re: Need Help! Samsung LCD TV LN46C630

                              Thank you and good luck in school. That is definitely a better option...

                              Comment


                                #16
                                Re: Need Help! Samsung LCD TV LN46C630

                                I hope it works for you. Thanks, I'm doing good in uni at the moment; my first year exams start Wednesday. Repairing stuff is just a hobby, but helps with EEng.
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment


                                  #17
                                  Re: Need Help! Samsung LCD TV LN46C630

                                  I have similar issues with my LN46C630. I wonder if the problem described in this thread was resolved or not?

                                  Comment


                                    #18
                                    Re: Need Help! Samsung LCD TV LN46C630

                                    So if you disconnect the cable between the power supply board and the main board, you get the backlights?
                                    So far we know that OP has the main board problem, he never gives us the follow-up.
                                    Main board for this model is not cheap:
                                    http://www.shopjimmy.com/catalogsear...CD+TV+LN46C630
                                    Last edited by budm; 02-06-2015, 09:50 PM.
                                    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


                                      #19
                                      Re: Need Help! Samsung LCD TV LN46C630

                                      Yup, here OP didn't follow up.

                                      Maybe I didn't describe my problem correctly, but in this thread it is perfectly described:

                                      https://www.badcaps.net/forum/showth...light=LN46C630

                                      There OP put his Mainboard in the oven and it worked. But I'm just going to make pics and video. Hope to upload it within an hour.

                                      Comment


                                        #20
                                        Re: Need Help! Samsung LCD TV LN46C630

                                        I saw that thread.
                                        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

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