Magnavox 32mf231 LCD Backlight still flickers

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  • vafghan20
    Member
    • Feb 2011
    • 11
    #1

    Magnavox 32mf231 LCD Backlight still flickers

    This is the original Post:

    https://www.badcaps.net/forum/showth...light=magnavox

    Hey guys, i am new to the forum have an issue with this 32 inch Mangavox LCD tv. Before repair TV screen backlight would flicker once or twice when you plugged it into a power outlet and then it would be dead. Took it apart and saw 2 caps vented on the Power supply and decided to replace three Cap's two that were vented and the other because of its location and size. After the replacement of the three cap's the screen flickers continuously like an old florescent lamp trying to light up. The TV has an led next to the power switch which never comes on in any color and never did since i have been working on this tv. The power button on the front has no effect on the flickering of the screen only when you plug it to an outlet is when you can stop or start the flicker of the screen. The Power supply board number is "3138 103 6282.1". Can somebody tell me if i put the right series caps on the Power supply. Do the small caps on these power supply go bad also and would it cause this symptom?

    Images show the Power supply and what type of caps i replaced

    Any input would be great.



    REPLY by PlainBill:

    Good job of documenting what you have done. The Panasonic NHG was a poor choice for this application. A Panasonic FM or FR would be the proper choices.

    PlainBill




    I took PlainBills advice and replaced the NHG cap with the proper FM cap. After this repair I still have the back light flicker continuously. No change from before. I am have done basic board level repairs on automotive applications and never tested power supply on a TV before. Can some one talk me through testing power input and output on this Power supply. The Power supply board number is "3138 103 6282.1".
    Attached Files
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    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: Magnavox 32mf231 LCD Backlight still flickers

      In the future, just keep everything related to your TV in one thread to make it easier to keep track of things.

      Can you also post pictures of the other boards (main, inverter board, etc)?

      How old is this TV?
      --- 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

        • vafghan20
          Member
          • Feb 2011
          • 11
          #3
          Re: Magnavox 32mf231 LCD Backlight still flickers

          Sorry for not including photo's of the other boards. The TV is from late 2005.

          here are photos of the 4 major boards on the back of the tv
          Attached Files

            Comment

            • lakeman
              New Member
              • May 2009
              • 2
              #4
              Re: Magnavox 32mf231 LCD Backlight still flickers

              had several of these set with same problem was main board going bad replaced it and fixed the problem

                Comment

                • vafghan20
                  Member
                  • Feb 2011
                  • 11
                  #5
                  Re: Magnavox 32mf231 LCD Backlight still flickers

                  Thanks for everybodys help; I will research replacement for the main board on this Magnavox and keep you guys updated on my progress.

                    Comment

                    • itek
                      Senior Member
                      • Aug 2010
                      • 65
                      #6
                      Re: Magnavox 32mf231 LCD Backlight still flickers

                      lakeman: what do you mean by main board (scalar board or main inverter board) and to
                      vafghan20: did you ever get your issue resolved?
                      Thanks!

                        Comment

                        • flavious27
                          Member
                          • Jun 2011
                          • 10
                          #7
                          Re: Magnavox 32mf231 LCD Backlight still flickers

                          Originally posted by vafghan20
                          Thanks for everybodys help; I will research replacement for the main board on this Magnavox and keep you guys updated on my progress.
                          What happened with your set. I know the power supply board costs over a $100 to replace, if you can find it in stock. I will hate to know how much more a main board is, if they are in stock.

                            Comment

                            • hyperman
                              New Member
                              • Apr 2012
                              • 1
                              • usa
                              #8
                              Re: Magnavox 32mf231 LCD Backlight still flickers

                              no updates so far, I've got the same exact problem, screen flickers a few times and shuts off, except I was told that a 2200uf 35v would replace a 1200 35v. But now with it being the main board going bad, I don't know if its worth fixing?

                                Comment

                                • TechShui
                                  Senior Member
                                  • Jun 2011
                                  • 148
                                  • USA
                                  #9
                                  Re: Magnavox 32mf231 LCD Backlight still flickers

                                  Why are you gravedigging this thread? It's almost a year old.

                                  There's already an active thread here: https://www.badcaps.net/forum/showthread.php?t=20153

                                  To answer your question: I too, have 2 dead magnavox scaler boards, and replacing does not make economic sense (they cost $80-100 on eBay).
                                  I've been following broksonic's thread closely, in the hopes that someone more knowledgeable will be able to help isolate the component.

                                  It could be the crystal IC, but no one has confirmed that...

                                    Comment

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