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    #1

    Emprex LM-2203 LCD

    I need some help with this monitor. When it is powered on the CCL come on for just a fraction of a second. When I do the flashlight trick I can see a image so the LCD seems to be working. Also I got hold of a CCL PS and tested the lamps on this panel and they seem to be okay. Just as a precaution I re-capped the broad except for the very large cap. Same issue before and after the re-cap




    PS Tried to UP some pics but it would not work

    THANKS for the help JOE
    Tags: None
    #2
    Re: Emprex LM-2203 LCD

    Originally posted by n7qpp
    I need some help with this monitor. When it is powered on the CCL come on for just a fraction of a second. When I do the flashlight trick I can see a image so the LCD seems to be working. Also I got hold of a CCL PS and tested the lamps on this panel and they seem to be okay. Just as a precaution I re-capped the broad except for the very large cap. Same issue before and after the re-cap

    PS Tried to UP some pics but it would not work
    Try this for posting pics

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

    If it doesn't work, it maybe due to the server being moved in the last 24 hours and everything may not have been transfered over properly?

    Anyways, good job of troubleshooting so far. Do you have a multimeter? If yes, check for open fuse, shorted transistors, open windings on transformers, bad diodes.

    If you need help testing the above, please say so and we can post instructions.

    What you are describing is 2 seconds to black and can be resolved given time, patience, and determination.
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      #3
      Re: Emprex LM-2203 LCD

      Do you have a multimeter? yes I do
      If yes, check for open fuse - only one that I can see and it is fine
      Shorted transistors - none that I can tell but not sure if any SMD are transistors
      open windings on transformers - will check
      bad diodes - will check





      This is the error I get when trying to UL

      Warning: move_uploaded_file(/home/www/web134/web/forum/attachments/0a043cd6caf7418ee2ebec1801e6afd7) [function.move-uploaded-file]: failed to open stream: No such file or directory in /includes/functions_file.php on line 277

      Warning: move_uploaded_file() [function.move-uploaded-file]: Unable to move '/tmp/php9fxfQE' to '/home/www/web134/web/forum/attachments/0a043cd6caf7418ee2ebec1801e6afd7' in /includes/functions_file.php on line 277

      Warning: filesize() [function.filesize]: stat failed for /home/www/web134/web/forum/attachments/0a043cd6caf7418ee2ebec1801e6afd7 in /includes/functions_file.php on line 289

      Comment

        #4
        Re: Emprex LM-2203 LCD

        Originally posted by n7qpp
        Do you have a multimeter? yes I do
        If yes, check for open fuse - only one that I can see and it is fine

        This is the error I get when trying to UL

        Warning: move_uploaded_file(/home/www/web134/web/forum/attachments/0a043cd6caf7418ee2ebec1801e6afd7) [function.move-uploaded-file]: failed to open stream: No such file or directory in /includes/functions_file.php on line 277

        Warning: move_uploaded_file() [function.move-uploaded-file]: Unable to move '/tmp/php9fxfQE' to '/home/www/web134/web/forum/attachments/0a043cd6caf7418ee2ebec1801e6afd7' in /includes/functions_file.php on line 277

        Warning: filesize() [function.filesize]: stat failed for /home/www/web134/web/forum/attachments/0a043cd6caf7418ee2ebec1801e6afd7 in /includes/functions_file.php on line 289
        Some fuses on the boards are picofuses (labeled like pf501) or those SMD tiny fuses.

        I can't do anything about the uploading of pics, but will have to hope that TopCat (the admin) sees this message and looks into it.
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          #5
          Re: Emprex LM-2203 LCD

          Okay went through the PCB and tested all diodes, transistors and fuses all seem good

          Comment

            #6
            Re: Emprex LM-2203 LCD

            Originally posted by n7qpp
            Okay went through the PCB and tested all diodes, transistors and fuses all seem good
            I just posted

            https://www.badcaps.net/forum/showthread.php?t=10419

            Maybe check for bad/cold/poor solder joints on the backside.

            Benqs have a reputation for having bad solder joints on the inverters and need to be resoldered.

            The only other Emprex LM-2203 posted here is back from January 2010 and there are no pics in that thread either. But they had the same 2 seconds to black problem.
            Last edited by retiredcaps; 07-23-2010, 09:12 PM.
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              #7
              Re: Emprex LM-2203 LCD

              Originally posted by n7qpp
              PS Tried to UP some pics but it would not work
              I forgot to mention that your pic should be 2000x2000 of LESS. If it is bigger, that could be the reason it doesn't upload properly.
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                #8
                Re: Emprex LM-2203 LCD

                Originally posted by retiredcaps
                Try this for posting pics

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

                If it doesn't work, it maybe due to the server being moved in the last 24 hours and everything may not have been transfered over properly?

                Anyways, good job of troubleshooting so far. Do you have a multimeter? If yes, check for open fuse, shorted transistors, open windings on transformers, bad diodes.

                If you need help testing the above, please say so and we can post instructions.

                What you are describing is 2 seconds to black and can be resolved given time, patience, and determination.
                One minor point - it is very rare that an open fuse would cause the 'two second to black' problem. An open fuse would result in a 'zero second to black' failure.

                Until the picture posting feature gets fixed (I notice problems also exist on threads with pictures previously posted), it will be very difficult to assist in troubleshooting these problems. About all that can be done is substitute a good CCFL in each position to see if the backlights stay on with a particular CCFL replaced.

                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: Emprex LM-2203 LCD

                  Originally posted by PlainBill
                  One minor point - it is very rare that an open fuse would cause the 'two second to black' problem. An open fuse would result in a 'zero second to black' failure.
                  I totally agree about an open fuse would cause zero second to black.

                  The only reason I mention is that I have a "in repair process" NEC 1700V monitor and I read this part from

                  http://www.electronicspoint.com/nec-...or-t75165.html

                  ">>I checked those two fuses on the inverter
                  >>board, AOK. I don't think the screen
                  >>would even light at all
                  >> if those fuses were bad.

                  > Yes, it will if only one of them is bad. I've
                  > fixed several of these with that fault."

                  The NEC 1700V might be unique in that respect with 2 fuses on the inverter board? Of course, we can't tell without pictures of this Emprex LM-2203 LCD! :-)
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                  Comment

                    #10
                    Re: Emprex LM-2203 LCD

                    Upload seems to be working here are my pictures
                    Attached Files

                    Comment

                      #11
                      Re: Emprex LM-2203 LCD

                      Originally posted by n7qpp
                      Upload seems to be working here are my pictures
                      Hmm, I'm not sure, but are those light blue caps from Radio Shack?

                      If they are, some here will have some not too kind words to say about Radio Shack caps.

                      I'm sure someone will ask for the part numbers on the back of the board. Probably IC 501 and IC 802.
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                        #12
                        Re: Emprex LM-2203 LCD

                        Guilty as charged I want to try to get this fixed over the weekend and did not have time to place a Mouser order so went to RS. But if I have to will order other caps. Here is the IC info:
                        IC801 IC803 IC501(hard to read) IC802
                        BC819 A1 OZ9938GN P1337
                        EL817 AS431A 7C2PI.2N PFMP
                        EVERLIGHT A0814 0813B

                        Comment

                          #13
                          Re: Emprex LM-2203 LCD

                          Updates IC

                          IC801
                          BC819
                          EL817
                          EVERLIGHT

                          IC803
                          A1
                          AS431A
                          A0814

                          IC501
                          OZ9938GN
                          7C2P1.2N
                          0813B

                          IC802
                          P1337
                          PFMP

                          Comment

                            #14
                            Re: Emprex LM-2203 LCD

                            Originally posted by n7qpp
                            OZ9938GN
                            Datasheet for OZ9938GN



                            Might be a good place to start understanding how it works and how it interacts with the entire system. Good bedtime reading. :-)
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                              #15
                              Re: Emprex LM-2203 LCD

                              Sure seems to be a little busy as start up

                              Comment

                                #16
                                Re: Emprex LM-2203 LCD

                                Originally posted by n7qpp
                                Okay went through the PCB and tested all diodes, transistors and fuses all seem good
                                And the transformers?
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                                  #17
                                  Re: Emprex LM-2203 LCD

                                  Originally posted by n7qpp
                                  Sure seems to be a little busy as start up
                                  Check out this thread re OZ9938.

                                  https://www.badcaps.net/forum/showth...9938#post81234
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                                    #18
                                    Re: Emprex LM-2203 LCD

                                    Originally posted by retiredcaps
                                    Check out this thread re OZ9938.

                                    https://www.badcaps.net/forum/showth...9938#post81234
                                    And follow this thread (it uses OZ9939). It is at the point where CapBlown is measuring the voltages on this chip.

                                    https://www.badcaps.net/forum/showth...3&page=3&pp=20
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                                      #19
                                      Re: Emprex LM-2203 LCD

                                      I believe I have found the problem. I was able to borrow a CCL tube from a co-worker. I was able to use it as a substitute tube. The inverter has 4 outputs to the CCL tubes I'll call them A1, A2, B1 and B2. I started to sub the external CCL on each connection. on A1, A2 same result with lamp shutdown. However when I sub'ed on B1 the monitor came right up. I have the panel connected to a laptop and set as the only monitor. I have been running a monitor test program for almost 4 hours with no issues. And will continue to run it all night.

                                      I think I can say the the CCL tube that connect to the B side has a problem. This happens to be the lower lamp (there are 2 lamp one at the top the other at the bottom).

                                      So do you think my conclusion is correct?

                                      The next question how do I spec out and get a complete replacement lamp?

                                      THANKS Joe

                                      Comment

                                        #20
                                        Re: Emprex LM-2203 LCD

                                        Originally posted by n7qpp
                                        The next question how do I spec out and get a complete replacement lamp?
                                        Before you order a new ccfl tube, try taking apart the one you have. Check to see if the tube is actually black or bad/cracked or if some solder/connection/wire is loose or bad.

                                        For replacements, you can try

                                        http://www.ccflwarehouse.com/

                                        http://www.ccfldirect.com/

                                        email them the lcd part number and see what they suggest. I have no experience with either company.
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