Nuova Marea MV-1501 (Unicont) Blink and off at power on

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  • sententia
    Badcaps Veteran
    • Oct 2013
    • 269
    • Greece

    #1

    Nuova Marea MV-1501 (Unicont) Blink and off at power on

    Hello everyone,

    I have this Nuova Marea display, which i found is manufactured by Unicont, that is a marine LCD. It can be supplied with 10-36VDC.

    The problem is that when power is supplied to it it blinks and then is dead. The output of the DC-DC converters is 11.6V and stays there when the monitor look dead, so i doubt it is that the problem. I also tried to supply 12V straight to the cables but no go.

    I tested one filter capacitor on the inverter board which is a HITANO ECR 330uf 50V and measures OK.

    Any ideas of what to check/measure next?

    Do you think the problem might be with the lamp connection on the lamp side?

    A lot of gables are glued so i am trying to be as less invasive as possible.

    Any help greatly appreciated!
    Thanks!
    Attached Files
  • sententia
    Badcaps Veteran
    • Oct 2013
    • 269
    • Greece

    #2
    Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

    some more pictures of the bottom side of the inverter.
    Attached Files

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31015
      • Albion

      #3
      Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

      try it with the invertor unplugged.

      Comment

      • sententia
        Badcaps Veteran
        • Oct 2013
        • 269
        • Greece

        #4
        Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

        Hmmm .... unplugging the inverter does not make any difference. Then power light does not blink... do you think i should check the logic circuit?

        Comment

        • sententia
          Badcaps Veteran
          • Oct 2013
          • 269
          • Greece

          #5
          Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

          Hello,
          I have taken some more pieces apart from the monitor and have done some more testing.

          By the way the LCD panel is a LG Philips ....

          I have replaced some capacitors from the logic pcb as the big 220uf 25V Chengx cap that measured around 195uf and 4ohms ESR but didn't seem to help. That logic board has a lot more smaller cap also from Chengx that make me worry if i should check all the small ones.

          Also i found that the power led is connected to the inverter board.

          If it is of any importance the monitor draws about 0.25 Amps with the inverter connected and about 0.11 without it.

          Does anyone know if the monitor would operate without the lamps connected?
          Or at least if the power led would be on??

          Thanks
          Attached Files
          Last edited by sententia; 07-13-2014, 07:41 AM.

          Comment

          • selldoor
            Slow Learner
            • Dec 2010
            • 7870

            #6
            Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

            It is an unusual setup - it is unlikely to "work" without bulbs as it will go into protection and shut down.
            With it all connected up can you anchor the black lead of your monitor to ground and with
            your meter on 20vdc put the red probe on each of the 12v pins (red and yellow) on the inverter as you switch the monitor on
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • sententia
              Badcaps Veteran
              • Oct 2013
              • 269
              • Greece

              #7
              Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

              Originally posted by selldoor
              It is an unusual setup - it is unlikely to "work" without bulbs as it will go into protection and shut down.
              With it all connected up can you anchor the black lead of your monitor to ground and with
              your meter on 20vdc put the red probe on each of the 12v pins (red and yellow) on the inverter as you switch the monitor on
              Yep, the inverter gets steady 11.6V at power on and stays there.

              The On/Off white wire get 0.03V at power on. When power supply is switched of it jumps to 0.3V and goes to 0.

              The only sign of life at power on is a faint blink of the backlight.
              Last edited by sententia; 07-13-2014, 08:22 AM.

              Comment

              • selldoor
                Slow Learner
                • Dec 2010
                • 7870

                #8
                Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                OK - Are the bulb leads soldered to the board? as against having plugs on? crazy!!
                Next test is for 5 v on the other connector on the inverter board same as before as you switch on.
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • sententia
                  Badcaps Veteran
                  • Oct 2013
                  • 269
                  • Greece

                  #9
                  Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                  Yes although the board does have plugs soldered to it! But on the other hand because it is a marine monitor they try to be as secured as possible, hence they are soldered to inverter plus hot glue on top!! (a bit of a pain to remove!).

                  Now the other connector. The 5V line is not used however the inverter outputs the 5V steady as soon as power is connected.

                  Also Pot+ and Pot have 0.25V both.

                  I start to think that i should make some cfl test lamps to get the lamp connection problem out of my head ... (i fixed some time ago two monitors with loose lamp cable on the lamp side.)
                  Last edited by sententia; 07-13-2014, 08:52 AM.

                  Comment

                  • selldoor
                    Slow Learner
                    • Dec 2010
                    • 7870

                    #10
                    Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                    Can you first do the same voltage test again on the LED pin.

                    Other queries - On the "Main?" board is the brown gunk flux or glue- can it clean off with
                    IPA to check its not corroding the traces. And its probably ok but in the bottom right corner of that board pic 7 there is a fuse F1 - can you test it?

                    Yes test cfl lamp is good - link in any budm post - I can find it if you cant.

                    Also can you unplug the two white plugs on the inverter and turn it over for a picture of the bottom of it.
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                    • sententia
                      Badcaps Veteran
                      • Oct 2013
                      • 269
                      • Greece

                      #11
                      Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                      Originally posted by selldoor
                      Can you first do the same voltage test again on the LED pin.

                      Other queries - On the "Main?" board is the brown gunk flux or glue- can it clean off with
                      IPA to check its not corroding the traces. And its probably ok but in the bottom right corner of that board pic 7 there is a fuse F1 - can you test it?

                      Yes test cfl lamp is good - link in any budm post - I can find it if you cant.

                      Also can you unplug the two white plugs on the inverter and turn it over for a picture of the bottom of it.
                      the voltage on the power led pins is 0.01V at all times. I have removed the brown glue under the coil and fuse is OK.

                      I have budm's ccfl tester link, thanks for the suggestion!

                      Check post #2 it is the bottom in two photos.

                      Thanks for the help really appreciated!

                      Comment

                      • selldoor
                        Slow Learner
                        • Dec 2010
                        • 7870

                        #12
                        Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                        Originally posted by sententia

                        Check post #2 it is the bottom in two photos.
                        Sorry - missed them totally - not that they help much. cant see through glue!
                        You are going to have to remove the glue or at least some of it.
                        In pic 1 the joints dont look good - but you my be able to tell better.
                        Next test is to work out which joints are the secondary winding posts on the
                        transformers- You measure both transformers ( meter on ohms 2000)
                        and the results have to be within 3%.
                        Is there a part number on the side or top of the transformers
                        Please upload pictures using attachment function when ask for help on the repair
                        http://www.badcaps.net/forum/showthread.php?t=39740

                        Comment

                        • sententia
                          Badcaps Veteran
                          • Oct 2013
                          • 269
                          • Greece

                          #13
                          Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                          Transformer is CTX410805 ... I have the datasheet attached to this post.

                          As for the joints of the transformer it looks like soldering residue or paste.

                          I am trying to remove the glue to take some more measurements and i will get back to you! ....
                          Attached Files

                          Comment

                          • selldoor
                            Slow Learner
                            • Dec 2010
                            • 7870

                            #14
                            Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                            Ok I see from the pdf there are two secondary windings on each transformer ( should have been obvious but see below) one to the socket and one to the wired posts. So you need 4 to compare.

                            What does seem odd is that normally if there are 4 places to attach a lamp they must all have a lamp connected else the feedback picks it up as an error and switches off the
                            lamp circuits. I can only guess that they have disabled the no lamp detection.
                            Please upload pictures using attachment function when ask for help on the repair
                            http://www.badcaps.net/forum/showthread.php?t=39740

                            Comment

                            • sententia
                              Badcaps Veteran
                              • Oct 2013
                              • 269
                              • Greece

                              #15
                              Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                              Transformers test ok in secondary. The secondaries are connected in series.

                              Each secondary is about 55ohms ...
                              Both are 110ohms ...

                              Now i took apart a cfl lamp but i see that there are four connections and i don't know how to proceed to connect it to the inverter. Are those two separate lamps or are they connected together??

                              Thanks!
                              Attached Files

                              Comment

                              • selldoor
                                Slow Learner
                                • Dec 2010
                                • 7870

                                #16
                                Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                                See budms pic https://www.badcaps.net/forum/attach...0&d=1333950677

                                Each pair are twisted together and it is one lamp.

                                solder a wire to each pair then unsolder one ccfl and solder the now 2wires from the cfl in its place.


                                Whoops - see next post
                                Last edited by selldoor; 07-14-2014, 08:25 AM.
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment

                                • selldoor
                                  Slow Learner
                                  • Dec 2010
                                  • 7870

                                  #17
                                  Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                                  STOP - may be wrong yours is a stick bulb may have 2 tubes
                                  Please upload pictures using attachment function when ask for help on the repair
                                  http://www.badcaps.net/forum/showthread.php?t=39740

                                  Comment

                                  • sententia
                                    Badcaps Veteran
                                    • Oct 2013
                                    • 269
                                    • Greece

                                    #18
                                    Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                                    Hello,
                                    thanks for pm ... I have not tried anything yet.

                                    it does look like two separate bulbs but they do seem to interconnect at the end.

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #19
                                      Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                                      His CFL is one lamp, just twist the two wires on each end together just like what I show in my pictures.
                                      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

                                      • sententia
                                        Badcaps Veteran
                                        • Oct 2013
                                        • 269
                                        • Greece

                                        #20
                                        Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

                                        thanks budm!

                                        so it doesn't matter that the board has separate connections for each wire?

                                        Comment

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