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    #1

    Magnavox 42mf531d/37 odd rings on top of screen

    hey guys I just picked up this TV it was full of domed capacitors and the power supply so wouldn't turn on I just replaced the capacitors with new nicheons caps and powered it up. Long and behold I got these odd white rings at the top of the screen. After about 5 minutes of being on the start to dissipate until they're gone. If I turn the TV off for even 30 seconds and turn it back on the rings are back full on and then after about 5 minutes it goes awayif I were a betting man I would say tab bonds are getting hot but it doesn't feel that way and it's all across the screen is about 5 different places as you can see. The LCD panel is made by LG Philips.


    http://i845.photobucket.com/albums/a...ps12e299f2.jpg
    Did I leave the soldering iron on?
    Tags: None
    #2
    Re: Magnavox 42mf531d/37 odd rings on top of screen

    Hmm, Interesting...

    get that hairdryer out and warm the bonds... see if they go faster

    Comment

      #3
      Re: Magnavox 42mf531d/37 odd rings on top of screen

      I'm thinking coefficient temperature of the tab on get hotter than the panel quicker for some reason possibly bad connection against the metal frame so is in essence they start to flexi LCD panel until the panel warms up to the same temperature at the tab bonds are in all is good the only thing I can think of.
      But interestingly it still doesn't explain why they're there is soon as I turn it on imediately almost like the LCD panel is flexed and straightens out with heat
      Did I leave the soldering iron on?

      Comment

        #4
        Re: Magnavox 42mf531d/37 odd rings on top of screen

        They look like pressure points like someone overtightened the bezel or similar ? Doesn't really explain how they go away on their own though...

        Comment

          #5
          Re: Magnavox 42mf531d/37 odd rings on top of screen

          I have had those before on some older 42" LG panels. They are simply caused by the TV being off for too long, part of the panel gets too cold. Once they go away they won't come back unless it gets too cold again. So you just need to let it run all night and it should be OK.

          In my case I left an LG 42LC46 off for the weekend and came back to find some very small rings. Concerned, I ran it, but after an hour they were gone... gave it to my dad to watch and they never came back, so...
          Last edited by tom66; 11-28-2013, 04:26 AM.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

            #6
            Re: Magnavox 42mf531d/37 odd rings on top of screen

            that makes sense but you know its really weird that if its been on all night in the rings are gone I can turn it off for one second turn it back on the rings reappear after about 5 seconds and then they go away after about 3 minutes they start at the very top and then expand outward kinda like a rainbow effect and then they disappear. Not that's really big deal and I'm pretty sure that someone to want this tv. it doesn't seem to hinder picture performance so I'm not really too concerned about it. Also I notice when its on those areas are a tiny bit darker than the rest of screen especially the white pictures.

            its just curiosity. It seems it maybe its behind the panel like maybe the diffuser
            Did I leave the soldering iron on?

            Comment

              #7
              Magnavox 37MF331D/37

              Hi. Newbie here.

              I am seeking -desperately- assistance.

              I am not an electronics tech at all.

              I have owned a Magnavox 37MF331D/37 for several years. From the very beginning, the TV set shut itself off, and the only way to get it going, was to unplug it from the power, and wait. It took hours, and some times, even days, to get it back to working order.

              Because I travelled a lot, the TV set issues were not that important to me. Now, I am stuck at home, and the TV used to keep me company with the background noise.

              But, the software problem of course has not been resolved with time, so recently (11-26-13) I finally decided to do the software upgrade.

              This is the file that I downloaded:

              37mf331d_37_fus_aen

              After upgrading the software, now the TV does not work at all. I have tried upgrading the software, re-programming the set, put new batteries on the remote, checked all the cables and connections on the
              TV set, but nothing seems to resolve this problem.

              Could you find out, if there is a way to restore the original TV's Factory software?

              At least with that, the TV worked on and off, although I had days where I could not watch TV at all.

              Now, I cannot watch TVno matter what! I still can play DVD's though.

              Thank you in advance, for your assistance.

              Tulio, in Texas

              Comment

                #8
                Re: Magnavox 37MF331D/37

                Originally posted by FrustratedinTX View Post
                Hi. Newbie here.

                I am seeking -desperately- assistance.

                I am not an electronics tech at all.

                I have owned a Magnavox 37MF331D/37 for several years. From the very beginning, the TV set shut itself off, and the only way to get it going, was to unplug it from the power, and wait. It took hours, and some times, even days, to get it back to working order.

                Because I travelled a lot, the TV set issues were not that important to me. Now, I am stuck at home, and the TV used to keep me company with the background noise.

                But, the software problem of course has not been resolved with time, so recently (11-26-13) I finally decided to do the software upgrade.

                This is the file that I downloaded:

                37mf331d_37_fus_aen

                After upgrading the software, now the TV does not work at all. I have tried upgrading the software, re-programming the set, put new batteries on the remote, checked all the cables and connections on the
                TV set, but nothing seems to resolve this problem.

                Could you find out, if there is a way to restore the original TV's Factory software?

                At least with that, the TV worked on and off, although I had days where I could not watch TV at all.

                Now, I cannot watch TVno matter what! I still can play DVD's though.

                Thank you in advance, for your assistance.

                Tulio, in Texas

                Did you look at the power supply for bulging leaky capacitors? That was this tvs initial problem. Three 1500uf 35v and one 2000uf 35v I believe were the problem.

                May not be the software upgrade more than a power supply fault.
                Did I leave the soldering iron on?

                Comment

                  #9
                  Re: Magnavox 37MF331D/37

                  Originally posted by freakaftr8 View Post
                  Did you look at the power supply for bulging leaky capacitors? That was this tvs initial problem. Three 1500uf 35v and one 2000uf 35v I believe were the problem.

                  May not be the software upgrade more than a power supply fault.
                  Thank you for your answer.

                  I am not a techie, not by a long stretch of the imagination.

                  The TV worked with the factory firmware. As soon as I updated it, it stopped working. I cannot watch TV, but I can watch DVDs.

                  My search is either for a better version of the firmware (Magnavox / Philips has not upgraded it in years) or, for a copy of the original firmware as it came with the TV set.

                  Thanks again.

                  Tulio

                  Comment

                    #10
                    Re: Magnavox 42mf531d/37 odd rings on top of screen

                    more or less like a main board problem if you're still getting video another inputs but the tuner.
                    Did I leave the soldering iron on?

                    Comment

                      #11
                      Re: Magnavox 42mf531d/37 odd rings on top of screen

                      Still, I would like to try to re-install the factory's original software, and see if that will resolve the issue.

                      If it does not, then I will take the next step, and take the TV to a technician, for the main board issues.

                      Anyone has a copy of that software?

                      Thank you.

                      FinTx

                      Comment

                        #12
                        Re: Magnavox 42mf531d/37 odd rings on top of screen

                        Same rings on 42MF531D magnavox. They subside after a 1/2 hour or so. On this tv they get worse for a few seconds after tv is powered up. Gonna let ride. I replaced the same caps as freakaftr8.

                        Comment

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