Samsung 2233SN panel problem

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • senndogg
    Badcaps Veteran
    • Dec 2011
    • 383
    • Albania

    #1

    Samsung 2233SN panel problem

    hello. i got this "beautiful from the outside" monitor which tbh is diagnosted elsewhere and the other technician has described the panel as faulty. i can see the board, nothing faulty at a glance, but the display is out of focus, the contrast saturated and text nearly unreadable.
    it is a Chunghwa CLAA215FA. ever spotted as faulty?
  • momaka
    master hoarder
    • May 2008
    • 12170
    • Bulgaria

    #2
    Re: Samsung 2233SN panel problem

    Do the monitor menus/OSD have the same problem? If no, then this could be a video/logic board issue. If yes, it might be the t-con.

    Either way, post some pictures of the video/logic board and the PSU board. I know this is unlikely to be power supply related issue, but if the voltages going to the video/logic board are unstable, you can get all sorts of weird behaviour. Could also be a marginal voltage regulator on the video/logic board.

    Comment

    • senndogg
      Badcaps Veteran
      • Dec 2011
      • 383
      • Albania

      #3
      Re: Samsung 2233SN panel problem

      thank you momaka, but i cant tell you if the OSD has this fault too because it is greyish itself, can tell the difference. i measured the voltages which are exactly:
      the 16V rail : 15,73V
      the 5.1V rail : 5,08V
      the 3.3V rail : 3,23V
      the caps look good and they are NXB Sam Young.

      anyway these are some photos of the symptoms and the board.


      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29


      the boards.


      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      By senndogg at 2011-12-29

      Comment

      • momaka
        master hoarder
        • May 2008
        • 12170
        • Bulgaria

        #4
        Re: Samsung 2233SN panel problem

        Try re-seating the LVDS cable that goes between the video/logic board and the t-con board.

        The only other thing I can think of is if one of the rails on the t-con is going weak due to a ceramic cap becoming shorted. Post some pictures of the t-con, particularly around the area that has a round inductor. The t-con is likely located under a metal cover on top of the display.

        Comment

        • senndogg
          Badcaps Veteran
          • Dec 2011
          • 383
          • Albania

          #5
          Re: Samsung 2233SN panel problem

          ok, ill show you them asap.

          Comment

          • dpauto47
            New Member
            • Dec 2008
            • 5

            #6
            Re: Samsung 2233SN panel problem

            Also if you look at the diode on circuit # BD1 it looks like it is burnt out on the anode side of it. shown in pic image # 10

            Comment

            • senndogg
              Badcaps Veteran
              • Dec 2011
              • 383
              • Albania

              #7
              Re: Samsung 2233SN panel problem

              thank you dpauto47 but it doesnt seem like a diode to me. it has the resistor logo from the other side of the board and it measures approx 0 ohms.


              here are the pics of the t-con:


              By senndogg at 2012-01-03


              By senndogg at 2012-01-03


              By senndogg at 2012-01-03


              By senndogg at 2012-01-03


              By senndogg at 2012-01-03


              By senndogg at 2012-01-03


              By senndogg at 2012-01-03


              By senndogg at 2012-01-03

              Comment

              • Scenic
                o.O
                • Sep 2007
                • 2642
                • Germany

                #8
                Re: Samsung 2233SN panel problem

                just to clarify what dpauto47 was talking about..

                Also if you didn't notice yet (discussion in another thread), all those externally hosted inline pics scare some of the more knowledgeable people away, as most of them aren't really useful, but you have to wait for all of them to load and get automatically resized every time you open the thread.

                Use the "manage attachments" thing if possible in the future.
                Click "Go advanced" under the text box. Then on the new page, there's a "manage attachments" button below the text box. Use that to upload the pictures to the forum. Once that's done, you can close the little popup window and post as usual. The images will show up like below this post.
                Attached Files

                Comment

                • senndogg
                  Badcaps Veteran
                  • Dec 2011
                  • 383
                  • Albania

                  #9
                  Re: Samsung 2233SN panel problem

                  i totally agree to use this feature but i just thought that external links could be just a bit more handy (it has been required to me in most forums), but its ok. no prob for me.

                  that component DB1, which TBH i dont know what is it, i desoldered one leg , and measured with the diode tester, beeped at both ways, and had a resistance of 0 ohms. it has a resistor symbol in fact.

                  Comment

                  • trebo
                    Badcaps Veteran
                    • Feb 2010
                    • 514
                    • Wales, UK

                    #10
                    Re: Samsung 2233SN panel problem

                    Originally posted by senndogg
                    that component DB1, which TBH i dont know what is it, i desoldered one leg , and measured with the diode tester, beeped at both ways, and had a resistance of 0 ohms. it has a resistor symbol in fact.
                    surely something wrong with it
                    looks like a diode
                    was wondering if it may be a ferrite bead???

                    Comment

                    • momaka
                      master hoarder
                      • May 2008
                      • 12170
                      • Bulgaria

                      #11
                      Re: Samsung 2233SN panel problem

                      Originally posted by trebo
                      was wondering if it may be a ferrite bead???
                      Could be (and most likely is).

                      If there was problem with something on the primary of the PSU, the PSU (and thus the monitor) wouldn't have worked at all in the first place. So the problem most likely is either on the video/logic board or the t-con board.

                      I find the t-con easier to check, so let's start with that...

                      Using this picture as a reference
                      http://img249.*************/img249/6...1201031326.jpg
                      measure the voltage between the cathode side of D501 (the side with the white stripe) and ground. Place the negative probe of your multimeter on ground. A good ground point to use is usually the bare traces where the screw holes for the t-con are. Let me know what voltage you get. Ideally, it should be anywhere between 9 and 20V (depending on the t-con design).

                      Also, using this picture as a reference,
                      http://img821.*************/img821/3...1201031326.jpg
                      check the part number on IC502 and post it here (IC502 is the small black chip to the left of the round inductor).

                      Comment

                      • senndogg
                        Badcaps Veteran
                        • Dec 2011
                        • 383
                        • Albania

                        #12
                        Re: Samsung 2233SN panel problem

                        Originally posted by momaka
                        Could be (and most likely is).

                        If there was problem with something on the primary of the PSU, the PSU (and thus the monitor) wouldn't have worked at all in the first place. So the problem most likely is either on the video/logic board or the t-con board.
                        yes. it looks that he hasnt got power issues. it just lacks quality of picture.

                        Comment

                        • senndogg
                          Badcaps Veteran
                          • Dec 2011
                          • 383
                          • Albania

                          #13
                          Re: Samsung 2233SN panel problem

                          thank you very much momaka, im gonna test them soon.

                          Comment

                          • senndogg
                            Badcaps Veteran
                            • Dec 2011
                            • 383
                            • Albania

                            #14
                            Re: Samsung 2233SN panel problem

                            the cathode side of the D501 and a good ground showed 13.08V
                            the IC502: AAT117
                            AOT256
                            0927

                            Comment

                            • momaka
                              master hoarder
                              • May 2008
                              • 12170
                              • Bulgaria

                              #15
                              Re: Samsung 2233SN panel problem

                              Originally posted by senndogg
                              the cathode side of the D501 and a good ground showed 13.08V
                              Looks good.

                              Next, measure the voltage at every pin of D502 and D504 with respect to ground.

                              Originally posted by senndogg
                              the IC502: AAT117 AOT256 0927
                              Can't find a data sheet for it, unfortunately. It's not that important, though.

                              Comment

                              • senndogg
                                Badcaps Veteran
                                • Dec 2011
                                • 383
                                • Albania

                                #16
                                Re: Samsung 2233SN panel problem

                                i think i screwed up sth. i just broke the connector of the t-con (( i think i cant resolder it cos the pins are broken


                                anyway here are the voltages
                                Attached Files

                                Comment

                                • momaka
                                  master hoarder
                                  • May 2008
                                  • 12170
                                  • Bulgaria

                                  #17
                                  Re: Samsung 2233SN panel problem

                                  Originally posted by senndogg
                                  i think i screwed up sth. i just broke the connector of the t-con (( i think i cant resolder it cos the pins are broken
                                  Oops.
                                  Keep it for spare parts. If you ever get a monitor with a white screen problem, you can use this one for parts. Or if you find a broken screen with a good LVDS connector, you may be able to put that one on this monitor.

                                  Originally posted by senndogg
                                  anyway here are the voltages
                                  These voltages look good too.
                                  There's a variable resistor on the board (to the left of IC502 in this picture). I'm not entirely sure what it does, but one of my guesses is it could be for the gamma adjustment.
                                  If you get the LVDS connector fixed, it may be worth to try and mess with this varistor to see what it does.

                                  Comment

                                  • senndogg
                                    Badcaps Veteran
                                    • Dec 2011
                                    • 383
                                    • Albania

                                    #18
                                    Re: Samsung 2233SN panel problem

                                    too many thanks momaka for everything, but i think i really broke it. im gonna try to resolder it when i ll have more free time. thanx anyway.

                                    Comment

                                    • hexid
                                      New Member
                                      • Feb 2012
                                      • 3

                                      #19
                                      Re: Samsung 2233SN panel problem

                                      HI Guys i have the same problem with this monitor ? Did you finde out how to fix it ?

                                      Comment

                                      • senndogg
                                        Badcaps Veteran
                                        • Dec 2011
                                        • 383
                                        • Albania

                                        #20
                                        Re: Samsung 2233SN panel problem

                                        hi hexid and sorry for the late reply.
                                        my monitor is archived at my store as faulty and i have never managed to repair it again. i have kept it for spare parts. i have used its psu and ccfls for some purposes.
                                        if you can go further with measurements we can try to help you.

                                        Comment

                                        Related Topics

                                        Collapse

                                        • Document Archive
                                          Samsung Galaxy Book 2 Notebook Specification for Upgrade or Repair
                                          by Document Archive
                                          This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                                          09-07-2024, 05:50 AM
                                        • NWArkGuy
                                          Samsung UN65TU8000 - Panel Issue [ hole in ribbon cable ]
                                          by NWArkGuy
                                          Well, I will be the first to admit that I screwed up...

                                          In attempting to replace the backlight in a UN65TU8000, I made a hole through one of the ribbon cables between the board that runs along the bottom of the back of the TV and the panel. This lead to a between a 1/4 to 1/2 inch vertical stripe running the full height of the image.

                                          I don't have the experience; personally, to solder a bridging wire for the paths that were cut. So, I have been on the hunt for other Samsung TV's of similar size.

                                          I have 2 that I have found and have in my possession. ...
                                          10-12-2023, 10:13 PM
                                        • KYBOSH
                                          Samsung UN50TU8000 - Dead Panel Forensic Questions
                                          by KYBOSH
                                          I came across a 50inch TU8000 that wouldnt start up properly (blinking stand-by light, backlights would cycle on and off).





                                          When i opened it up and removed the power to the mainboard the backlights powered up and everything looked uniform.
                                          When reconnected the mainboard but disconnected the flex cable to the panel i heard the TV startup with the intro sound.






                                          Later I checked for shorts on the panel PCB boards but could not find anything.
                                          When I took a look with the FLIR i noticed the 2 resistors...
                                          08-10-2024, 08:39 AM
                                        • howardc64
                                          Samsung UN55JU650DF network/streaming problem
                                          by howardc64
                                          Fixed a 9 year old UN55JU650 by replacing backlight. Original backlight LED was still working after 27k! hours but terrible picture of course. Few LEDs were out, 5-6 lens fell off (bright white spots) and another few popped off with slightest force. Surviving LEDs were all slightly blue so picture has a blue tint.

                                          This TV runs older Tizen OS (updated to latest version, see pic) and have problems with network (wifi or ethernet) connection. The Tizen UI frequently switch to coax input source while changing content sources. . If no good signal (coax not connected, no prior antenna/cable...
                                          Yesterday, 12:44 PM
                                        • perzyk23
                                          Lenovo T580 - LCD Panel problem - error 0288
                                          by perzyk23
                                          Good morning,
                                          I have a problem with Lenovo T580, which after error code 0288 suggests a problem with the display. I checked the display and it works on another laptop. I replaced the display cable with a new one. I programmed another BIOS (downloaded from this forum) and I still have the problem of a dead display - there is an image via HDMI, and the system does not detect the built-in LCD at all. The problem appears to be hardware. What can I check to confirm or disprove this? I found many threads on the Internet related to this problem 0288, but without specific solutions. Please advise....
                                          10-25-2024, 12:42 AM
                                        • Loading...
                                        • No more items.
                                        Working...