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    samsung LNS4695DX TV Has blinking power light - No Picture

    Hello All.
    My Samsung LNS4696DX LCD TV, has no picture or sound. When I push the power button to turn it on, the blue power light blinks. Any common problems with these symptoms? I have the power supply board out, looking for cracked solder joints, and anything out of the norm. Any advise, and all help is greatly appreciated. Thanks,

    TubeJunkie

    #2
    Re: samsung LNS4695DX TV Has blinking power light - No Picture

    I assume since it's a Samsung, you've ruled out bad caps?
    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: samsung LNS4695DX TV Has blinking power light - No Picture

      Look at the front and back of the screen in a dark room to see if you notice any glow from the screen.
      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


        #4
        Re: samsung LNS4695DX TV Has blinking power light - No Picture

        No screen glow at all. I took out all caps (see 1st pic) on power supply board and tested each one out of circuit. None looked bulged, or leaky, but most of the 1000uf 10v caps were at the top 20% of value. Most of these caps drifted down while testing. I ordered these caps last night.

        I pluuged in again, after installing the power board, and there is a beeping noise coming from the middle area of this board. Also noticed a blinking green light on the input/tuner board (see pic). Which is labled OP182. Anyone have advise? All help is greatly appreciated. Thanks.

        Addition: Also noticed SA801 (looks a lamp/bulb) on power board, is not working. Should this light up?
        Attached Files
        Last edited by TubeJunkie; 11-27-2012, 12:02 PM. Reason: Added info

        Comment


          #5
          Samsung LNS4695DX TV Has blinking power light FIX - SOLUTION

          Wow....... Think I figured it out. I took a hair dryer and heated the power board caps (see pic) for about two minutes, turned on the TV, and it worked!!! I'm replacing those caps when they arrive in the mail. I'll let you all know how it goes, after the recap. Hope this helps others. TTYL.

          TubeJunkie
          Attached Files

          Comment


            #6
            Re: samsung LNS4695DX TV Has blinking power light - No Picture

            Same problem........... I replaced all the said caps with new Panasonic caps, and still have the same problem. I did'nt replace LM851 & LM852, not sure what they are. Strange looking components... Any advise is welcome.

            I can use the hair dryer on the same area, and get it to power on. Should I replace the two big caps (150uf - 450v.)???
            Attached Files

            Comment


              #7
              Re: samsung LNS4695DX TV Has blinking power light - No Picture

              The LM etc. are inductors and do not need replacement.

              Do you get good 13V and 5V from the PSU?
              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


                #8
                Re: samsung LNS4695DX TV Has blinking power light - No Picture

                Originally posted by tom66 View Post
                The LM etc. are inductors and do not need replacement.

                Do you get good 13V and 5V from the PSU?
                Hey tomm66,
                I'm getting 12.vdc and 5.4vdc. I noticed the big inverter,with the green tape around it (see pic),is humming and sounds like electrical arcing going on. Don't know what this means. What should I do next? Thank You for your help.
                Attached Files

                Comment


                  #9
                  Re: samsung LNS4695DX TV Has blinking power light - No Picture

                  Does it hum when you get it running by heating the PSU?

                  Can you localise the heating to one specific portion? I know Samsung TVs of this generation had lots of cold joint problems.
                  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


                    #10
                    Re: samsung LNS4695DX TV Has blinking power light - No Picture

                    Originally posted by tom66 View Post
                    Does it hum when you get it running by heating the PSU?

                    Can you localise the heating to one specific portion? I know Samsung TVs of this generation had lots of cold joint problems.
                    Yes, hums while on. And it's humming while it's off, with power cord attatched, of course. I heat the area that I replaced the caps, and it turns on. There is a beeping noise around UB801 too. Not sure what that means. If I let the TV run for a while and turn it off, I can turn on with remote, within a few minutes. But if it cools down, no luck. Any other idea's? Thanks

                    Comment


                      #11
                      Re: samsung LNS4695DX TV Has blinking power light - No Picture

                      Inspect the board around there for bad caps.

                      There is a voltage regulator on the heatsink for 12V. It derives the voltage from the 13V. Check if that is OK.
                      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


                        #12
                        Re: samsung LNS4695DX TV Has blinking power light - No Picture

                        I'll check as you instructed. Can you tell me the number on the board for the voltage regulator? Do you have the schematic for this model?

                        Comment


                          #13
                          Re: samsung LNS4695DX TV Has blinking power light - No Picture

                          I should have said:
                          "Inspect the board around there for bad JOINTS."

                          Schematic -- will need "BN44" code printed on board.

                          Don't recall regulator number sorry.
                          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


                            #14
                            Re: samsung LNS4695DX TV Has blinking power light - No Picture

                            I checked all caps, "Out Of Circuit", and most all were pushing, or beyond 20% tolerence. Also, I noticed was, the cheap-o factory caps drift wildly on the meter, as compared to new Panasonic caps.

                            So, what I did next was to focusing the heating (hair dryer), of the power supply board to small area's. In particular, the two big 150uf - 450v caps. One of those started to swell on it's top and sides, after only a few hair dryer power ups. And intrestingly enough, I could turn it on after 15 minutes. The heat changed the properties of this cap, I think. ??? And it's dying a slow death. Maybe???? Anyway, I ordered all the other caps on the Power supply board, that have yet to be replaced. Still cant find a schematic, guess I'll have to buy one. Wish me luck......

                            Comment


                              #15
                              Re: samsung LNS4695DX TV Has blinking power light - No Picture

                              I replaced all electrolytic capacitors on the power supply board, and it fired right up. Been working great for about a week now. The original CapXon brand caps are total crap. Some of the worst caps ever made. C'mon Samsung. I used all Panasonic capacitors as replacements. And wherever it calls for 10volt, I used 16volt. I read that Samsung was sued for using 10 volt caps in the 12 volt circuit. Oh, I noticed the TV picture is starting to look better and better over the last few days. Maybe the new caps are forming up, or I'm adjusting to a different TV, Oh, Well, Who Knows. I'm happy !!!!!!! Glad I did'nt give up on it.....

                              Hope this helps others.

                              TubeJunkie

                              Comment


                                #16
                                Re: samsung LNS4695DX TV Has blinking power light - No Picture

                                Great works, I always replace the cap as a set so I do not have to open the TV up again.
                                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


                                  #17
                                  Re: samsung LNS4695DX TV Has blinking power light - No Picture

                                  Originally posted by TubeJunkie View Post
                                  And wherever it calls for 10volt, I used 16volt. I read that Samsung was sued for using 10 volt caps in the 12 volt circuit.
                                  If Samsung used 10V caps on the 12V rail, the caps would have gone almost immediately.
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                                  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.

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                                    #18
                                    Re: samsung LNS4695DX TV Has blinking power light - No Picture

                                    Originally posted by retiredcaps View Post
                                    If Samsung used 10V caps on the 12V rail, the caps would have gone almost immediately.
                                    I promise you, they used 10v caps in a 12v circuit. Check into it a little more. No disrespect, but that's what was stock, in my TV. And in others too, from what I've read. I dig the explosion avatar..... lol.... Thanks.

                                    Comment


                                      #19
                                      Re: samsung LNS4695DX TV Has blinking power light - No Picture

                                      I have never seen that in a Samsung. They sure used shoddy caps, but they didn't overvolt them... they would fail within a couple of days to weeks if they were overvolted, not just one month after the warranty ended...
                                      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


                                        #20
                                        Re: samsung LNS4695DX TV Has blinking power light - No Picture

                                        Originally posted by TubeJunkie View Post
                                        I promise you, they used 10v caps in a 12v circuit.
                                        Is it possible that 10V caps are actually on the 5.4V or standby rail?
                                        --- 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 ---

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