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Maxent MX-26X3

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    Maxent MX-26X3

    I don't think this TV actually has bad caps, and I failed to find any with bulging or electrolyte expulsion on the bottom of the capacitors. The specs for one (lonesome?) capacitor are 85 deg. C, 1000 uF, 10V, and the designation T53.

    I turned on this TV, got the expected behavior (blue screen, acquiring signal, transmitting image), and then after a second, a series of vertical lines about 10 pixels wide, but never a good image. LCD itself is fine.

    FixYa indicated two possible problems, both of whom point to the video chip. I think this was inscribed or etched on that chip:

    DCRe
    SVP
    EX52
    7052 LF
    A HDD02
    D1W95.1
    0532/D5082033
    (c) Trident '04

    I removed the old thermal epoxy, and used four sparing drops of Loctite Control Gel and Arctic Silver 5 on that heatsink. No change in behavior, even though I have yet to feed it a signal.

    I'd like to reflow the solder on that chip (with a heat gun? mini blow-torch? tealight candles?). Yes, this would be my first reflow. I'm not even sure if I'm using the correct terminology, but I'd love to find an instructional URL detailing solder reflow for dummies.

    I'd be grateful for your feedback.

    Thanks for reading.
    Attached Files

    #2
    Re: Maxent MX-26X3

    Those Caps look to be Elite, Or CapXon's I have replaced many that have no bulging or leaking and it has fixed the problem. I would suggest replacing them. They are very close to the Mosfets and get hot and dry out. I would myself re-cap those 5 before getting oiut the Tealight Candles.
    ^Learning to walk on rice paper without leaving a trace,

    Comment


      #3
      Re: Maxent MX-26X3

      You see all those little silver cans? They are electrolytic caps. If you go up a level in the forum, and over to the CDrom section, one poster noted he replaced a bunch of them and his CDrom drive could then read discs that it could not previously read. I would expect there to be a problem in the signal area of the board, not in the power supply.
      Forgive me if I am telling you something you already know. The brown caps by the power supply clean up the dc voltage. If you can scope the output, you can see if they are working.
      tom

      Comment


        #4
        Re: Maxent MX-26X3

        The KZE on the power board are appropriate there.
        The other Radials look to be Panasonic/Matsushita by the shape of the vents.
        The SMD I'm not sure. I don't see a logo.
        Mann-Made Global Warming.
        - We should be more concerned about the Intellectual Climate.

        -
        Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.

        - Dr Seuss
        -
        You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
        -

        Comment


          #5
          Re: Maxent MX-26X3

          Originally posted by lkvee
          The specs for one (lonesome?) capacitor....
          Does it date Fuhjyyu's?
          Mann-Made Global Warming.
          - We should be more concerned about the Intellectual Climate.

          -
          Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.

          - Dr Seuss
          -
          You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
          -

          Comment


            #6
            Re: Maxent MX-26X3

            Thanks for the feedback. I've taken the back cover off again to get a better look at the capacitors. I'm using the picture called "Complete Board" as a reference.

            I used a Cen-Tech point-and-shoot thermometer to get some temperature readings, too.

            The heatsink measured about 118 degrees F. There's another chip that lie "southeast" of the heatsink and that measured 136 degrees F when the thermometer was directly applied to the top of that chip. The one further away about "east-south-east" of the green heatsink measured 98 degrees F. The one northeast of the green heatsink measured 82 degrees F.

            The really big capacitor on the right is specified for 150uF and 450V.

            The smaller capacitor towards the bottom right is specifed for 1000uF and 10V and is also general purpose (85 deg C).

            There are seven electrolytic capacitors towards the bottom left of the picture. The top two are specified for 220uF and 25V and have the designation "HFA". The row of four have the designation "T53" and those capacitors are specified for 2200uF and 10V. The last capacitor is a general purpose capacitor (2200uF and 16V).

            The set by the aluminum towards the upper left of the picture is specified as follows:

            The column of six to the left of the aluminum block are specified at 220uF and 35V. The five to the right of the aluminum block have two specified at 470uF and 35V, one at 280uF and 25V, and two at 1000uF and 16V. These are the KZE capacitors.

            I didn't see the designation "Fuhjyyu" on any of the capacitors.

            I'm still focused on the chip underneath the green heatsink. I'm also still quite open for other ideas, and would like to reflow the BGA solder underneath.

            Thanks again for the input!

            Comment


              #7
              Re: Maxent MX-26X3

              The mention of Fuhjyyu was a joke...
              You know, "lonely cap", needs a date.. .. Oh. never mind...
              Fuhjyyu are complete junk. You don't WANT to see one.

              "HFA" sounds like a Panasonic number but I can't find it at Panasonic so maybe it was Matsushita only production.
              "T53" is probably a date code.
              .
              Mann-Made Global Warming.
              - We should be more concerned about the Intellectual Climate.

              -
              Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.

              - Dr Seuss
              -
              You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
              -

              Comment


                #8
                Re: Maxent MX-26X3

                i have the same problem with the vertical line , and notice that one of the caps on the signal board was loose , replace the cap with a regular electrolytic cap with double the voltage on cap from 25v to 50v and got not results so i detecting the board now

                Comment


                  #9
                  Re: Maxent MX-26X3

                  Originally posted by sucram100 View Post
                  i have the same problem with the vertical line , and notice that one of the caps on the signal board was loose , replace the cap with a regular electrolytic cap with double the voltage on cap from 25v to 50v and got not results so i detecting the board now
                  So, which capacitor did you replace exactly? I only recall one for 280 uF and 25V. If I'm reading your post correctly, after changing that capacitor, you still got vertical lines and got no change in behavior - you still have a TV working less than 100%.

                  Comment


                    #10
                    Re: Maxent MX-26X3

                    I took another look at the 208-pin QFP, and I found bridged and bent pins:

                    http://*************/photo/my-images/854/dsc0058ad.jpg/

                    There's another one on another side that's displaced also. It's not as bad as the ones pictured here.

                    Looks like this damage may have been deliberate. Colleague surmised it was done by an unscrupulous repair shop which wanted to cover its anatomy when they told the previous owner there's nothing they could do to fix this monitor.

                    I don't have the equipment to completely repair this. Sure, I have a thin X-Acto knife, but I'll need something with a 1/32" chisel tip to be able to solder with such precision. I don't have a 30X stereo microscope either.

                    Thoughts?
                    Attached Files

                    Comment


                      #11
                      Re: Maxent MX-26X3

                      With experience this can be soldered with an average sized chisel tip. Practice on a few bum parts first and watch the YouTube videos on SMD soldering.
                      sig files are for morons

                      Comment


                        #12
                        Re: Maxent MX-26X3

                        The pin on the far right could be straightened since it is still attached to the board. I did a similar repair before. However, the two pins on the left have broken loose from the board. That will be more difficult.

                        Comment


                          #13
                          Re: Maxent MX-26X3

                          Originally posted by severach View Post
                          With experience this can be soldered with an average sized chisel tip. Practice on a few bum parts first and watch the YouTube videos on SMD soldering.
                          I've been a repeat viewer of the video from Curious Inventor. My colleagues chuckle in disbelief when they see the size of a 603 resistor and the very same 208-pin QFP I want to fix.

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