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Barco LCN-42 No Power

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    #1

    Barco LCN-42 No Power

    Got hold of a new Monitor to play with!

    Its come from a TV studio. They tried another power supply in it to get it going and it wouldn't so they decided to bin it. The nice chap I bought it off said that they don't really try hard to fix them its quicker just to put up a new one.

    I have found the company that make then and the model is listed here...

    http://www.barco.com/en/product/1821

    It looks like they are a really good brand the quality feels amazing.

    Has anybody ever delt with one of these? if do you you possibly have access to the service guide for it?

    I have attached some pics.
    Attached Files
    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

    How to resize your pictures guide click HERE
    Retiredcaps Ideal post example click HERE
    Tags: None
    #2
    Re: Barco LCN-42 No Power

    So.. what's the problem with it? lol

    I already see a bunch of bulging caps on the board above the amplifier (?) heatsinks and a SMD fuse (with golden contacts!?) on the same board.

    Can't really tell what that board is. The unconnected spaghetti all over the place don't really help either lol

    Comment

      #3
      Re: Barco LCN-42 No Power

      Im still taking it apart. Just took some pictures as it is so that I know what's going where.

      I can see some bulging caps on the component input board.

      Apparently they have tried another PSU in it already and that didn't work. I am going to take some more stuff off it then I will get some more pics.

      You heard of this make before?
      Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

      How to resize your pictures guide click HERE
      Retiredcaps Ideal post example click HERE

      Comment

        #4
        Re: Barco LCN-42 No Power

        Noooooooo

        Blown Fuse! fallen at the first hurdle!
        Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

        How to resize your pictures guide click HERE
        Retiredcaps Ideal post example click HERE

        Comment

          #5
          Re: Barco LCN-42 No Power

          Thought I would strip the Power Supply down a little to see what's going on.

          Glad I did. Looks like a couple of caps have had it.

          Also looks like there is a resistor burnt out.

          Is it thermal paste that is used between the metal heat sinks?
          Attached Files
          Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

          How to resize your pictures guide click HERE
          Retiredcaps Ideal post example click HERE

          Comment

            #6
            Re: Barco LCN-42 No Power

            Here is underneath the board looks like more damage!

            There looks to be a blown copper strip just above J34.

            J34 also looks to be damaged. I will measure it to see if it is blown.
            Attached Files
            Last edited by Jasgriff; 03-18-2012, 02:24 PM.
            Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

            How to resize your pictures guide click HERE
            Retiredcaps Ideal post example click HERE

            Comment

              #7
              Re: Barco LCN-42 No Power

              Originally posted by Jasgriff View Post
              Also looks like there is a resistor burnt out.
              All I can see with 90% certainty is red black silver. I don't know about the last 2.
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                #8
                Re: Barco LCN-42 No Power

                Safe to say its well and truely gone though? Do you know what wattage it might be it looks massive.
                Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                How to resize your pictures guide click HERE
                Retiredcaps Ideal post example click HERE

                Comment

                  #9
                  Re: Barco LCN-42 No Power

                  Originally posted by Jasgriff View Post
                  Looks like a couple of caps have had it.
                  In the motherboard and ATX PS sections of this forum, a lot of people say that OST branded caps can fail without bloating. I see some OST caps on your board.
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                    #10
                    Re: Barco LCN-42 No Power

                    Originally posted by Jasgriff View Post
                    Safe to say its well and truely gone though? Do you know what wattage it might be it looks massive.
                    Try and measure the resistor out of circuit first to see if the first digit is a "2" for the "red band" on your Fluke 175. It might even show up as 19??? or some close variation.

                    I'm not the greatest at spatial awareness so I'll pass on the guessing. However, it looks like you have a lot of room around it so if you guess really high for wattage, then it will fit and you have a safety margin.
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                    Comment

                      #11
                      Re: Barco LCN-42 No Power

                      Originally posted by Jasgriff View Post
                      Blown Fuse!
                      Whenever I see a blown fuse, I always check the bridge rectifier and power mosfet to see if they are shorted.
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                        #12
                        Re: Barco LCN-42 No Power

                        I am sure that if I can see 2 failed caps then the others will more than likely be in poor condition.

                        I have fixed the SMD Jumper so now I am thinking replace the Fuse the Resistor and patch the broken track then give it a try?

                        Could that resistor blowing be responsible for the board damage?

                        Does the Jumper repair look good enough?
                        Attached Files
                        Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                        How to resize your pictures guide click HERE
                        Retiredcaps Ideal post example click HERE

                        Comment

                          #13
                          Re: Barco LCN-42 No Power

                          Originally posted by retiredcaps View Post
                          Whenever I see a blown fuse, I always check the bridge rectifier and power mosfet to see if they are shorted.
                          I will Check the Rectifier and Mosfet now.

                          Here is a proper picture of the blown resistor it is showing as 'OL' so its definitely gone.
                          Attached Files
                          Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                          How to resize your pictures guide click HERE
                          Retiredcaps Ideal post example click HERE

                          Comment

                            #14
                            Re: Barco LCN-42 No Power

                            Originally posted by Jasgriff View Post
                            if do you you possibly have access to the service guide for it?
                            How good are you at guessing file names?

                            I found

                            http://www.fspgroupusa.com/fsp4173m01/p/769.html





                            but neither show a schematic of the power supply.
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                              #15
                              Re: Barco LCN-42 No Power

                              Originally posted by Jasgriff View Post
                              Does the Jumper repair look good enough?
                              See if it reads close to 0.0 Ohms. If yes, then it is okay.

                              edit: It is odd that J33 shows 000 and J34 shows just 0.
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                                #16
                                Re: Barco LCN-42 No Power

                                Originally posted by Jasgriff View Post
                                I will Check the Rectifier and Mosfet now.
                                Maybe hookup a light bulb in series after replacing all the components since the fuse is blown?

                                http://www.repairfaq.org/samnew/tvfaq/tvtslbt.htm
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                                  #17
                                  Re: Barco LCN-42 No Power

                                  Originally posted by retiredcaps View Post
                                  See if it reads close to 0.0 Ohms. If yes, then it is okay.

                                  edit: It is odd that J33 shows 000 and J34 shows just 0.
                                  It shows 000 as I store that off another board and replaced the blown one.

                                  It reads close to 0 OHMS and I have traced it back to the nearest components each side and it still shows as close to 0 OHMS.

                                  See I did such a good job you couldn't tell it was re soldered lol
                                  Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                  How to resize your pictures guide click HERE
                                  Retiredcaps Ideal post example click HERE

                                  Comment

                                    #18
                                    Re: Barco LCN-42 No Power

                                    Does Red Black Silver Brown Green look about right for that resistor?
                                    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                    How to resize your pictures guide click HERE
                                    Retiredcaps Ideal post example click HERE

                                    Comment

                                      #19
                                      Re: Barco LCN-42 No Power

                                      Originally posted by Jasgriff View Post
                                      Does Red Black Silver Brown Green look about right for that resistor?
                                      With the above, according to the URL below, it is invalid.

                                      http://www.hobby-hour.com/electronic...calculator.php

                                      The silver might be gray? It is the 3rd and 4th band I'm unsure of. Initially I thought the 3rd band was silver and it still looks more silver than gray to me. However, I see the 3rd band can ONLY be gray due to it being a 5 band resistor.

                                      That would make it 2.08k ohm 0.5% resistor if the 4th band is brown.

                                      Maybe post another pic showing it rotated 180 degrees and try cleaning the resistor up with some isopropyl alcohol?
                                      Last edited by retiredcaps; 03-18-2012, 04:02 PM. Reason: doh moment re color gray in a 5 band resistor
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                                      Comment

                                        #20
                                        Re: Barco LCN-42 No Power

                                        The middle band cant be silver according to this website.

                                        http://www.diyalarmforum.com/5-band-resistor-calc/

                                        I have attached a better pic.
                                        Attached Files
                                        Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                        How to resize your pictures guide click HERE
                                        Retiredcaps Ideal post example click HERE

                                        Comment

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