Memorex Model MLT3221

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • C22
    New Member
    • Mar 2012
    • 6
    • United States of Amaerica

    #1

    Memorex Model MLT3221

    This Memorex 32 inch LCD has a power supply board made by Proview. It is assembly number IPOS 150 Rev 1.8. The screen went dark. Upon examining the board. EC 17 and EC18 (Aluminum Electrolytic capacitors) 10 MF, 450 V, 85*C had bulging tops. Replaced them with Radio Shack (Aluminum Electrolytic caps) LTE,10MF, 450 V, 105 *C. Picture is back and TV is working.
    But there is a large capacitor designated as FC2, presumably a filter cap. It is unusually marked like 25/105/V36. I would interpret this to be 25 MF, 105*C, 36 Volts, but I have not seen a cap marked like this before. My concern is that the top is bulging and I feel it may be stressed, so I would like to replace it.

    It is the large cap laying down between the heat sinks. I don't have a parts list so I'm unable to know the true value.
    This Proview board is also used in Polaroid LCD TVs. Model TDA-03211C comes to mind.
    Help
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Memorex Model MLT3221

    Pictures of this cap?
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • cashkennedy
      Badcaps Veteran
      • Aug 2011
      • 666
      • USA

      #3
      Re: Memorex Model MLT3221

      He tried linking the picture, but he linked a picture that was on his own computer, so the link is obviously invalid.

      If you want to post pictures on this site you need to use the manage attachment function anyways, not just link them in the message.

      To use manage attachments, go to reply (not quick reply), and scroll down below where you type the message, and you should see a manage attachments button.
      Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

      Comment

      • C22
        New Member
        • Mar 2012
        • 6
        • United States of Amaerica

        #4
        Re: Memorex Model MLT3221

        Repeat of upload of mlt3221 cap pic. Does this work?
        Attached Files

        Comment

        • C22
          New Member
          • Mar 2012
          • 6
          • United States of Amaerica

          #5
          Re: Memorex Model MLT3221

          OK, I guess it did.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Memorex Model MLT3221

            I can see on the top left of the pictures, two caps with domed top, but I cannot see FC2. ThisMAGMEET power supply looks familiar, full pictures of the power supply?
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870

              #7
              Re: Memorex Model MLT3221

              Hi This board has featured before here is one like it https://www.badcaps.net/forum/showthread.php?p=173355. But cap description slightly different - i have seen a few
              with slight differences 36v 37v 40v.
              I think you will be correct in thinking 25uF, 105*C, 36 Volts, but as you board is working
              you can check the voltage across the cap - polarity is important.
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Memorex Model MLT3221

                Its value is 150uF 450VDC. This power supply has PFC Voltage booster circuits. 165`170Vdc when TV is OFF, about 380~400Vdc when TV is ON.
                Last edited by budm; 03-25-2012, 05:32 PM.
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • C22
                  New Member
                  • Mar 2012
                  • 6
                  • United States of Amaerica

                  #9
                  Re: Memorex Model MLT3221

                  These may be better photos of FC2 of this mlt3221.
                  Thanks
                  Attached Files

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Memorex Model MLT3221

                    It is 150uF 450VDC
                    Never stop learning
                    Basic LCD TV and Monitor troubleshooting guides.
                    http://www.badcaps.net/forum/showthr...956#post305956

                    Voltage Regulator (LDO) testing:
                    http://www.badcaps.net/forum/showthr...999#post300999

                    Inverter testing using old CFL:
                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                    http://s807.photobucket.com/user/budm/library/

                    TV Factory reset codes listing:
                    http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • selldoor
                      Slow Learner
                      • Dec 2010
                      • 7870

                      #11
                      Re: Memorex Model MLT3221

                      Originally posted by budm
                      It is 150uF 450VDC
                      Hi Budm - just as a learning thing where did you find that out?
                      Please upload pictures using attachment function when ask for help on the repair
                      http://www.badcaps.net/forum/showthread.php?t=39740

                      Comment

                      • retiredcaps
                        Badcaps Legend
                        • Apr 2010
                        • 9271

                        #12
                        Re: Memorex Model MLT3221

                        Originally posted by selldoor
                        Hi Budm - just as a learning thing where did you find that out?
                        Just remember that this big filter cap has to be at least > 120V x 1.4141 or > 220V x 1.4141 since it is on the hotside so there is no way it can be 36V.

                        My guess is that budm has worked on this before and probably consulted his own notes at

                        http://s807.photobucket.com/albums/y...orex%20MLT3221
                        --- 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

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Memorex Model MLT3221

                          I have the whole controller box with me, I had to lift the cap up to see the marking. This model is almost exactly the same as Polaroid.
                          Yes, I worked on these power supply before, and he should changed those two caps from Radio Shack with low ESR type, otherwise they will go bad again, he was lucky that they did not take out the two MOSFETs when the caps went bad. Use PANASONIC FM/FC/FR series instead. 36VDC cap would have blown right up. Power supply will always has large 250vdc minimum (for US, Higher for Euro) for the Main DC on the primary side to supply the power.
                          Last edited by budm; 03-26-2012, 09:29 AM.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment

                          • selldoor
                            Slow Learner
                            • Dec 2010
                            • 7870

                            #14
                            Re: Memorex Model MLT3221

                            Thanks Budm - when you say "I had to lift the cap up to see the marking" are they marked differently on the other side - hypothetically If I found one in a box of bits is there any way of knowing what rating it is.
                            Please upload pictures using attachment function when ask for help on the repair
                            http://www.badcaps.net/forum/showthread.php?t=39740

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Memorex Model MLT3221

                              The printings were on the other side of the cap, I had to pry the body up to see the cap value and the voltages. You can check the capacitance value and ESR (if the cap is still good) with the meter but not the working voltage of the unknown cap.
                              Never stop learning
                              Basic LCD TV and Monitor troubleshooting guides.
                              http://www.badcaps.net/forum/showthr...956#post305956

                              Voltage Regulator (LDO) testing:
                              http://www.badcaps.net/forum/showthr...999#post300999

                              Inverter testing using old CFL:
                              http://www.badcaps.net/forum/showthr...er+testing+cfl

                              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                              http://s807.photobucket.com/user/budm/library/

                              TV Factory reset codes listing:
                              http://www.badcaps.net/forum/showthread.php?t=24809

                              Comment

                              • Dgtech
                                E. Technician
                                • Apr 2009
                                • 1462
                                • Steeler

                                #16
                                Re: Memorex Model MLT3221

                                Be certain that you replace the main common defective components. The two caps closest to the two large transformers are 10uf 450 volt capacitors.
                                I would normally say not to change the large one. I'd try the two first and then see what you got after that.
                                The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Memorex Model MLT3221

                                  He did replace them with the caps from RS "The screen went dark. Upon examining the board. EC 17 and EC18 (Aluminum Electrolytic capacitors) 10 MF, 450 V, 85*C had bulging tops. Replaced them with Radio Shack (Aluminum Electrolytic caps) LTE,10MF, 450 V, 105 *C. Picture is back and TV is working."
                                  Last edited by budm; 03-26-2012, 11:11 AM.
                                  Never stop learning
                                  Basic LCD TV and Monitor troubleshooting guides.
                                  http://www.badcaps.net/forum/showthr...956#post305956

                                  Voltage Regulator (LDO) testing:
                                  http://www.badcaps.net/forum/showthr...999#post300999

                                  Inverter testing using old CFL:
                                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                  http://s807.photobucket.com/user/budm/library/

                                  TV Factory reset codes listing:
                                  http://www.badcaps.net/forum/showthread.php?t=24809

                                  Comment

                                  • Dgtech
                                    E. Technician
                                    • Apr 2009
                                    • 1462
                                    • Steeler

                                    #18
                                    Re: Memorex Model MLT3221

                                    Sorry, just caught that. Working nightshift has my "attention to detail" screwed. LOL
                                    The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                                    Comment

                                    • C22
                                      New Member
                                      • Mar 2012
                                      • 6
                                      • United States of Amaerica

                                      #19
                                      Re: Memorex Model MLT3221

                                      Budm: Thanks from C22. I will replace RS caps with Panasonic caps for good measure. Copy the 150MF@ 450V. Will use Panasonic for that one also.
                                      Appreciate your input.

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #20
                                        Re: Memorex Model MLT3221

                                        Trick to remove that large cap that is glued down, mark the Positive and Negative legs on the board, then use razor blade to cut a line on the tubing of the cap, cut the legs off the cap then you will be able to easily lift the cap body off the board. This will make it easier to remove the tubing which is glued to the board, and the legs will be easily removed also.
                                        Another reason is that we do not want to flex the board too much, you may crack the surface mounted MLC (multilayer ceramic) caps.
                                        https://www.badcaps.net/forum/showthread.php?t=19663
                                        Last edited by budm; 03-26-2012, 10:00 PM.
                                        Never stop learning
                                        Basic LCD TV and Monitor troubleshooting guides.
                                        http://www.badcaps.net/forum/showthr...956#post305956

                                        Voltage Regulator (LDO) testing:
                                        http://www.badcaps.net/forum/showthr...999#post300999

                                        Inverter testing using old CFL:
                                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                        http://s807.photobucket.com/user/budm/library/

                                        TV Factory reset codes listing:
                                        http://www.badcaps.net/forum/showthread.php?t=24809

                                        Comment

                                        Related Topics

                                        Collapse

                                        • Document Archive
                                          HP ZBook 14 G2 Base Model Notebook 14 Specification for Upgrade or Repair
                                          by Document Archive
                                          This specification for the HP ZBook 14 G2 Base Model 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 14 G2 Base Model boardview and 14 G2 Base Model 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...
                                          09-06-2024, 05:27 AM
                                        • Document Archive
                                          HP EliteBook 840 G2 Base Model Notebook 800 Specification for Upgrade or Repair
                                          by Document Archive
                                          This specification for the HP EliteBook 840 G2 Base Model 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 840 G2 Base Model boardview and 840 G2 Base Model 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,...
                                          09-06-2024, 05:27 AM
                                        • Document Archive
                                          HP ProBook 640 G1 Base Model Notebook 600 Specification for Upgrade or Repair
                                          by Document Archive
                                          This specification for the HP ProBook 640 G1 Base Model 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 640 G1 Base Model boardview and 640 G1 Base Model 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,...
                                          09-06-2024, 05:27 AM
                                        • Document Archive
                                          HP ZBook 15u G2 Base Model Notebook 15 Specification for Upgrade or Repair
                                          by Document Archive
                                          This specification for the HP ZBook 15u G2 Base Model 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 15u G2 Base Model boardview and 15u G2 Base Model 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,...
                                          09-06-2024, 05:27 AM
                                        • edugimeno
                                          Vaillant 242 Gas Water heater. Shortcut in board anc compatibility with model 282
                                          by edugimeno
                                          Hi!!
                                          Yesterday I was installing a new Wifi thermostat for my domestic gas water heater model Vaillant 242/2-3, and accidentlly one wire from mains touched one wire from the thermostat output contacts. This shut off the heater so I finished installing the thermostat and then went out to check the heater

                                          I found one fuse blown (T2 250V). Replaced it with another equivalent fuse and it blew right away. I measured L-N in mains input and I sometimes got 4K but sometimes, not sure why, I got 100 Ohm...
                                          At a certain point, moving stuff around, I put all wires back in place and...
                                          03-24-2024, 02:31 PM
                                        • Loading...
                                        • No more items.
                                        Working...