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    #1

    LG Flatron L1933TR again....

    New here, I found a post on the same issue i have. I got a LG Flatron L1933TR for free and would like to fix it. It's not getting any power at all. I assume it is the cap issue that others have. I saw the list of caps in the other thread, but where do i go about ordering them? I tried to look them up on the digikey site, but in not really sure what to get as I am new to this.

    Values are as follows:
    C202: 25V 1000uF
    C203: 25V 680uF
    C204: 16V 1000uF
    C205: 16V 1000uF
    C206: 25V 1000uF
    C207: 25V 470uF
    C103 is also a GF, 50V 33uF.
    Any help on where and how to order these would be appreciated.
    Thanks,
    Greg
    Tags: None
    #2
    Re: LG Flatron L1933TR again....

    Originally posted by zeebo271
    New here, I found a post on the same issue i have. I got a LG Flatron L1933TR for free and would like to fix it. It's not getting any power at all. I assume it is the cap issue that others have. I saw the list of caps in the other thread, but where do i go about ordering them? I tried to look them up on the digikey site, but in not really sure what to get as I am new to this.

    Values are as follows:
    C202: 25V 1000uF
    C203: 25V 680uF
    C204: 16V 1000uF
    C205: 16V 1000uF
    C206: 25V 1000uF
    C207: 25V 470uF
    C103 is also a GF, 50V 33uF.
    Any help on where and how to order these would be appreciated.
    Thanks,
    Greg
    Two ways to do this. In either case, start by measuring the diameter of all caps that are in 'close quarters'. Also, measure and determine the highest capacitor that will fit.

    You can follow this procedure to select appropriate caps. I suggest you post your selections so someone can review your choices. Speaking from experience, it is embarrassing if the repaired monitor works, but you can't get the back on because a cap was too high.

    Alternatively, once you have appended the dimension information someone will look up the appropriate caps.

    PlainBill
    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

    Comment

      #3
      Re: LG Flatron L1933TR again....

      Before you order the caps, did you look to see if any were bloated or leaking?

      I had one monitor that had no power and all the caps looked good. So I looked at the backside and noticed poor solder joints on the main AC input connector. I resoldered and it fixed the issue.

      I left the old caps in.

      Originally posted by zeebo271
      It's not getting any power at all. I assume it is the cap issue that others have.
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      Comment

        #4
        Re: LG Flatron L1933TR again....

        Originally posted by zeebo271
        Any help on where and how to order these would be appreciated.
        Don't forget to update your profile with your location so someone can suggest an appropriate source for parts!

        Comment

          #5
          Re: LG Flatron L1933TR again....

          Have you checked that the board receives power? I mean, AC is getting to the Big cap? besides caps, you may have a blown fuse or a shorted Bridge rectifier (that in turn would blow up the input fuse ...)
          There are 10 kind of people in this world: those that understand binary, and those who don't.
          • ASUS ROG Maximus IX Code
          • Intel Core i5-7600K 3.8GHz
          • 16gb GSKILL TridentZ RGB DDR4-3200
          • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
          • Windows 10 Pro x64
          • GeForce GT1050
            2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

          Comment

            #6
            satisfied customer

            Hello,
            Neighbor tossed a flatron 19 inch monitor. My wife picked it up. I came here and got info on bad capasitors and now i have a working lcd monitor!
            I kept putting off buying a new monitor because my 1996 17 inch crt is still kicking, but for $11.98 i have a nice lcd now.
            Thanks to all who helped!!
            Greg

            Comment

              #7
              Re: satisfied customer

              It should be funny if you invite that neighbor over and he/she notices that you have a monitor just like their old one that "died"!

              Originally posted by zeebo271
              Hello,
              Neighbor tossed a flatron 19 inch monitor. My wife picked it up.
              --- 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

                #8
                Re: satisfied customer

                Originally posted by retiredcaps
                It should be funny if you invite that neighbor over and he/she notices that you have a monitor just like their old one that "died"!
                That might work in Canada. In the US you might get a response 'Hey, that looks like my monitor that was stolen.'

                PlainBill
                For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                Comment

                  #9
                  Re: LG Flatron L1933TR again....

                  I have an L1933TR monitor that is not turning on. Currently, I'm attempting to take the monitor apart. I've got the four screws out of the back and I'm trying to find the right way to separate the front panel from the back panel. Can anyone who's taken one of these monitors apart describe how they did so?

                  Comment

                    #10
                    Re: LG Flatron L1933TR again....

                    Originally posted by Kong View Post
                    Can anyone who's taken one of these monitors apart describe how they did so?
                    Be careful when opening because there may be fragile connections, but this video gives you an idea

                    http://www.youtube.com/watch?v=Ul5LhuCT1y8

                    You basically need to pry the thing apart.

                    After it is apart, post clear focused pictures after reading

                    https://www.badcaps.net/forum/showthread.php?t=1868
                    --- 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

                      #11
                      Re: LG Flatron L1933TR again....

                      Originally posted by retiredcaps View Post
                      Be careful when opening because there may be fragile connections, but this video gives you an idea

                      http://www.youtube.com/watch?v=Ul5LhuCT1y8

                      You basically need to pry the thing apart.

                      After it is apart, post clear focused pictures after reading

                      https://www.badcaps.net/forum/showthread.php?t=1868
                      Thank you for posting that information. One of the caps on the main board does seem to be buldging at the top. In the included pictures it's the cap on the lower right, closest to the heatsink (it's a Samxon 1000uF 16v cap). Could that cap be causing the problem?
                      Attached Files

                      Comment

                        #12
                        Re: LG Flatron L1933TR again....

                        Originally posted by Kong View Post
                        Thank you for posting that information. One of the caps on the main board does seem to be buldging at the top. In the included pictures it's the cap on the lower right, closest to the heatsink (it's a Samxon 1000uF 16v cap). Could that cap be causing the problem?
                        Yes, it's probably the cause. It sitting so close to the heatsink didn't help any. While your at it, you should go ahead and replace them all. Use Panasonic FM series from digikey.com and select USPS First Class postage for the best rate.

                        Comment

                          #13
                          Re: LG Flatron L1933TR again....

                          Originally posted by Kong View Post
                          Thank you for posting that information. One of the caps on the main board does seem to be buldging at the top. In the included pictures it's the cap on the lower right, closest to the heatsink (it's a Samxon 1000uF 16v cap). Could that cap be causing the problem?
                          That could be it. The recommended procedure is to replace ALL the caps. The one you indicated is in a bad location (next to a heat sink), however there is no reason to believe the others are in perfect shape.

                          As an example from nearly two years ago, I had received a 17" Gateway monitor with the classic 'won't start' problem. Opening it up, I found most of the capacitors were bulging, so I replaced them. After spending $15 for caps and shipping, the monitor still wouldn't work. After tearing my hair out, searching the internet, etc, I found a reference on this site that indicated the problem was the 22uF, 100 volt cap that 'never fails' - one of the three caps I hadn't replaced. It didn't take long to figure out I never wanted to repeat this experience.

                          'Not turning on' can be caused by several bad caps such as the one you identified. Or they can be caused by a single $.25 cap.

                          PlainBill
                          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                          Comment

                            #14
                            Re: LG Flatron L1933TR again....

                            Originally posted by jetadm123 View Post
                            Yes, it's probably the cause. It sitting so close to the heatsink didn't help any. While your at it, you should go ahead and replace them all. Use Panasonic FM series from digikey.com and select USPS First Class postage for the best rate.
                            Thank you for the suggestion. Are there any methods that can be used to protect capacitors that are close to heatsinks?

                            Comment

                              #15
                              Re: LG Flatron L1933TR again....

                              Originally posted by PlainBill View Post
                              That could be it. The recommended procedure is to replace ALL the caps. The one you indicated is in a bad location (next to a heat sink), however there is no reason to believe the others are in perfect shape.

                              As an example from nearly two years ago, I had received a 17" Gateway monitor with the classic 'won't start' problem. Opening it up, I found most of the capacitors were bulging, so I replaced them. After spending $15 for caps and shipping, the monitor still wouldn't work. After tearing my hair out, searching the internet, etc, I found a reference on this site that indicated the problem was the 22uF, 100 volt cap that 'never fails' - one of the three caps I hadn't replaced. It didn't take long to figure out I never wanted to repeat this experience.

                              'Not turning on' can be caused by several bad caps such as the one you identified. Or they can be caused by a single $.25 cap.

                              PlainBill
                              Was there any clear indication that the 22uF 100V cap you are referring to was malfunctioning, or did it seem to be fine upon inspection?
                              Last edited by Kong; 08-11-2010, 05:25 PM.

                              Comment

                                #16
                                Re: LG Flatron L1933TR again....

                                Originally posted by Kong View Post
                                Was there any clear indication that the 22uF 100V cap you are referring to was malfunctioning, or did it seem to be fine upon your initial inspection?
                                It looked perfect. The really small caps don't bulge like a 1000uF, 16 volt one will. The just quietly die and leave the clueless (like I was) tearing their hair out.

                                PlainBill
                                For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                Comment

                                  #17
                                  Re: LG Flatron L1933TR again....

                                  Originally posted by PlainBill View Post
                                  It looked perfect. The really small caps don't bulge like a 1000uF, 16 volt one will. The just quietly die and leave the clueless (like I was) tearing their hair out.

                                  PlainBill
                                  Ok, so when you say to replace all the caps were talking about the smallest all the way up to the big one(s), right?

                                  Comment

                                    #18
                                    Re: LG Flatron L1933TR again....

                                    Due to space limitations and the nature of the design, there's probably not a whole lot you can do to protect against the heat, unless of course you want to install a small fan on the EMI shield that covers the power supply (more trouble than it's worth! And generating it's own EMI might cause further problems).

                                    PlainBill gave excellent advice on replacing the small cap. In this forum, it seems that people (I admit I was one of them!) are resistant to replacing the small caps. They are one of the cheapest parts pricewise and can stop a monitor cold in its tracks if they fail. The small cap usually doesn't show bulging, but should be replaced because they're part of the startup circuit.
                                    Last edited by jetadm123; 08-11-2010, 05:42 PM.

                                    Comment

                                      #19
                                      Re: LG Flatron L1933TR again....

                                      Originally posted by Kong View Post
                                      Ok, so when you say to replace all the caps were talking about the smallest all the way up to the big one(s), right?
                                      In general I don't urge people to replace the large (100uF, 450 Volt) one. It encounters much less stress than the others. It is also the most expensive. At a very rough guess, about 1% of the time that cap is part of the problem. Now I WOULD urge anyone who is repairing monitors as a hobby to have one on hand (perhaps scrounged from an unrepairable monitor) to use for test purposes.

                                      PlainBill
                                      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                      Comment

                                        #20
                                        Re: LG Flatron L1933TR again....

                                        I just finished fixing an L1933TR I picked up at a recycle shop for $10. Nice monitor, well worth the effort.

                                        I replaced three of the power supply caps; a 1000uf/16V (used 25V), a 680uf/25V (used 1000uf/25V) and a 470uf/25V. When I put the monitor back together, the backlight came on but the video (graphics) did not.

                                        I pulled the small green computer board (next to the power supply board) from its mounting and reheated all of the connections on the white dual-row video connector (underside of the PCB) near the center of the board. I also reseated the flat connector that slides into the socket on the lower edge of the large LCD panel.

                                        This time, when I applied power, the monitor worked perfectly; I'm using it now.

                                        I suspect we will see more of this reheat-to-fix in the future, as the RoHS solder joints begin to deteriorate. Just one more thing to check when we fix up these orphans...

                                        klaxon44

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