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Dell W4201C TV Bad Cable Picture

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    #1

    Dell W4201C TV Bad Cable Picture

    I have a w4201c with very bad cable reception. The TV started to dislpay wavy lines moving from top to bottom when first turned on, after a few minuts the picture cleared up. Days later the TV would turn on (blue power light in button was active) but no dell splash screen, remote was unresponsive, and turned off after minuts or so. I have completed the cap replacement on the power board as suggested in many threads, the TV turnes on every time and is responsive to the remote, however the wavy lines have the picture moving around so much, nothing can be viewed (audio is clear and clean); reminds me of 'tracking' on old VHS tapes. I am using the digital coaxial input with a standared def. cable box. The channal "fine tuning" helpes for 5 minuts sometimes moving as far as 30-75 (default is 50, range 1-100), color tone is lost but the waves are not as promanenet for a few minuts.
    Dose anyone have infomation or experence about what might be causing this? I have read a handfull of threads on 'www.fixya.com' suggesting the horizontal and high voltage section of the power board (might also be the excitation circuit) might be damaged but did not give any fix insturctions or trouble shooting suggestions.
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    #2
    Re: Dell W4201C TV Bad Cable Picture

    Tuners require a +33V supply to maintain good tuning; did you replace the tiny cap for this at the same time as others?
    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: Dell W4201C TV Bad Cable Picture

      Thank you for the replay Tom. I have only replaced two 2200 uf, 10volt caps located between two heatsinks on the near the center line of the board. I was advised to replace them with 2200 uf 35volt caps.
      How can I locate the tiny cap for tuning on the +33v line?

      Comment

        #4
        Re: Dell W4201C TV Bad Cable Picture

        Originally posted by rigg5766 View Post
        Thank you for the replay Tom. I have only replaced two 2200 uf, 10volt caps located between two heatsinks on the near the center line of the board. I was advised to replace them with 2200 uf 35volt caps.
        How can I locate the tiny cap for tuning on the +33v line?
        Post a pic of your power board, clear and focused, close to 2000x2000 (but not exceeding these dimensions.) I recommend a sunny day for light.
        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

          #5
          Re: Dell W4201C TV Bad Cable Picture


          I can take better picture when it is not raining outside but this is my power board. Is there a way to test the voltage to the tuner?

          Comment

            #6
            Re: Dell W4201C TV Bad Cable Picture

            I can't see your pic for some reason - can you upload it using the manage attachments feature.
            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: Dell W4201C TV Bad Cable Picture



              This is the most complicated picture post I have ever tried to complete, (PEBCAC error mostly).
              I was doing some additional trouble shooting last night and I attempted to engage the multidisplay modes (POP, PBP,PIP) and the TV restarted.
              Attached Files

              Comment

                #8
                Re: Dell W4201C TV Bad Cable Picture

                Can you post a closer picture of the "Output" table near the bottom of the power supply (or you could list each output, don't need to worry about current or other things.)
                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

                  #9
                  Re: Dell W4201C TV Bad Cable Picture

                  I have the same TV and its doing the exact same thing, However I have not put any time into to locate the fault. So if someone figures this out before I get to it, that would be nice.

                  I forgot I change the PS and have not yet check to see if the new PS possibly fix this. reply tommorrow for answer. This way I can tell you if it is in the PS or tuner section.
                  Last edited by JimmysTGP; 05-31-2012, 12:19 PM. Reason: adding information on thread

                  Comment

                    #10
                    Re: Dell W4201C TV Bad Cable Picture

                    Nice to know I'm not the only one with this problem. Here are more pictures of the power board. I'm hoping to find a solution and save this TV from the landfill.
                    Attached Files

                    Comment

                      #11
                      Re: Dell W4201C TV Bad Cable Picture

                      Is there a test point anywhere for the +29V?
                      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: Dell W4201C TV Bad Cable Picture


                        There is a 'test point' for the 29v circut however I have looked over the board and there is no ground, RTN 'tet point'. I used a multimeter to messure accrost the plug terminals. 28.9v very stable, no change in voltage.
                        Attached Files

                        Comment

                          #13
                          Re: Dell W4201C TV Bad Cable Picture

                          Over the weekend I have taken a multimeter to the power board. I have been told that all the mounting scrows are grounded, however every test point on the board is reading an unstable voltage vering by as much at 7 to 15 volts for the low volt connections. I have tested almost all the plug terminals and they are all stable, never changeing. The good news is I found one line running from a DC-DC board (located next to the mainboard) to the tuner card, the line is marked for 5v and is testing at 4.4v. Everything else in appears to have the correct volts. Anybody know where I can get parts for this TV?

                          Comment

                            #14
                            Re: Dell W4201C TV Bad Cable Picture

                            I cant see that anyone has asked this yet forgive me if they have - did you or are you able to try another source- I cant see pics of full boards other than the
                            power supply so donr know what other connectors ar available - PC.DVi Scart
                            HDMI. If they all work except the one you re using this could narrow down the fault.
                            Please upload pictures using attachment function when ask for help on the repair
                            http://www.badcaps.net/forum/showthread.php?t=39740

                            Comment

                              #15
                              Re: Dell W4201C TV Bad Cable Picture

                              I'll sell you my extra PS if you need it, its exact as yours. PM me if interested

                              Comment

                                #16
                                Re: Dell W4201C TV Bad Cable Picture

                                selldoor, My problem is local to the tv tuner. On the other inputs there is a very faint line moving top to bottom very slowly but if you sit back about 10 feet you cant see it. The only other problem I have come accrost is in the multi screen mode (PIP/POP/PBP) If any of the screens use the tv tuner the TV will restart and revert to a single input but only when the cable is plugged in. I can use all modes with no cable pluged in; however and input on the TV tuner causes restart and reset to single input.

                                Comment

                                  #17
                                  Re: Dell W4201C TV Bad Cable Picture

                                  Can you post pictures of the front and back of the tuner/input board someone may be able to spot something adrift. Also check carefully for bent pins or dirt in all the source connectors.
                                  Please upload pictures using attachment function when ask for help on the repair
                                  http://www.badcaps.net/forum/showthread.php?t=39740

                                  Comment

                                    #18
                                    Re: Dell W4201C TV Bad Cable Picture

                                    Sorry for the long replay time, I live near the High Park Fire in Colorado, very interesting last few days.

                                    Here are Photos of the tuner card and one of a DC-DC Board I'm hoping someone has more information about. Everything else on the TV is working fine; TV tuner picture is still not clear and the only voltage I can see is wrong is a 5v line running from this DC-DC board to the tuner card, reading 4.4v. Thanks to anyone willing to help me.
                                    Attached Files

                                    Comment

                                      #19
                                      Re: Dell W4201C TV Bad Cable Picture

                                      That low 5V could be causing the problems. Can you post an overall picture of the DC-DC board?
                                      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: Dell W4201C TV Bad Cable Picture

                                        Originally posted by tom66 View Post
                                        That low 5V could be causing the problems. Can you post an overall picture of the DC-DC board?

                                        Ha ha ! Hmm! Hi Tom - did you see the board above the DC DC board - leaking electrolyte?
                                        Please upload pictures using attachment function when ask for help on the repair
                                        http://www.badcaps.net/forum/showthread.php?t=39740

                                        Comment

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