Proview 19" Back light problem, Replaced Caps already

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  • haris2887
    New Member
    • Nov 2010
    • 6
    #1

    Proview 19" Back light problem, Replaced Caps already

    hi all..
    i got a Proview 19" monitor with a back light problem
    I have replaced the bulging caps already and at least the monitor turns on now...
    but i cant get the back light going..

    Now i realist the are tow cathodes ( Backlights) in the pannel one at the top and one at the bottom.
    if i disconnect the Top Cathode ( by not plugin the wires into the PSU) i get the monitor going for about 3-4 seconds before it cuts out... (see video)

    if i plug it in It I get scrambled image...(see Video)

    So i think the problem might be in the Inverter circuit somewhere for the top cathode ?
    I am not very good with trouble shooting..

    i have the following Pics..

    note the PCB discoloration..


    Possible problem in the White Square Plugs circuit for BackLight (top right corner)









    Last edited by haris2887; 11-03-2010, 11:42 PM.
    Tags: None
    • haris2887
      New Member
      • Nov 2010
      • 6
      #2
      Re: Proview 19" Back light problem, Replaced Caps already

      More Videos coming...

        Comment

        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271
          #3
          Re: Proview 19" Back light problem, Replaced Caps already

          Originally posted by haris2887
          i have the following Pics..
          Since this is your first post, you should read the following on how to insert pictures (do not post them inline).

          People will not be happy with megabytes of pictures the way you posted them (they slow down loading), but you can edit them and correct it, please.

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

          Here is an example of the pictures we need ...

          https://www.badcaps.net/forum/showpo...94&postcount=1
          --- 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

            • haris2887
              New Member
              • Nov 2010
              • 6
              #4
              Re: Proview 19" Back light problem, Replaced Caps already

              http://www.youtube.com/watch?v=50cWaWW7-Dc
              This is what happens when i have everything plugged normally

              http://www.youtube.com/watch?v=X2nfycVkwNk
              This happens when i disconnect one of the Cathodes for the back-light..

                Comment

                • Rtech
                  Badcaps Legend
                  • Jul 2010
                  • 1095
                  #5
                  Re: Proview 19" Back light problem, Replaced Caps already

                  Apart from the Large Capacitor, and the small one close to it, behind the Heatsink,you need to change ALL of the rest,not just the ones that were bulging !!! then see what happens,as it still could be a faulty backlight ??

                    Comment

                    • haris2887
                      New Member
                      • Nov 2010
                      • 6
                      #6
                      Re: Proview 19" Back light problem, Replaced Caps already

                      i have already replaced all the Caps.

                      All the Black Caps are new, 9old one were a green color like the small one next to the huge balck one...

                        Comment

                        • haris2887
                          New Member
                          • Nov 2010
                          • 6
                          #7
                          Re: Proview 19" Back light problem, Replaced Caps already

                          Originally posted by retiredcaps
                          Since this is your first post, you should read the following on how to insert pictures (do not post them inline).

                          People will not be happy with megabytes of pictures the way you posted them (they slow down loading), but you can edit them and correct it, please.

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

                          Here is an example of the pictures we need ...

                          https://www.badcaps.net/forum/showpo...94&postcount=1
                          I cant edit the pictures ??

                            Comment

                            • bonney
                              Senior Member
                              • Oct 2008
                              • 74
                              #8
                              Re: Proview 19" Back light problem, Replaced Caps already

                              you need to change your CCFL tubes

                                Comment

                                • haris2887
                                  New Member
                                  • Nov 2010
                                  • 6
                                  #9
                                  Re: Proview 19" Back light problem, Replaced Caps already

                                  Problem Solved
                                  All i had to do was swap the Cathode tubes..
                                  i was plugin them in wrong..

                                  so i plugged the top in bottom plug and the bottom in top plug and BAM... Works First time (total of 4 plug )

                                    Comment

                                    • PlainBill
                                      Badcaps Legend
                                      • Feb 2009
                                      • 7034
                                      • USA
                                      #10
                                      Re: Proview 19" Back light problem, Replaced Caps already

                                      Good. Now BEG Topcat (the administrator) to allow you to remove those huge pictures. What a pain in the ass this thread will be if it's not done.

                                      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

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