Viewsonic fixed but I do not understand

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  • Dpacro
    Member
    • Dec 2010
    • 13
    #1

    Viewsonic fixed but I do not understand

    I have got a viewsonic n2751w that had no picture.

    I found out that the inverter board had a blow little tiny fuse on it a 0.75A 76V.

    I also traced out the source of the problem.

    One 5V feed that was comming of the controller board was shorted on the inverter board direct to the ground.

    I have located a resistance marked with a 0 on it. I think 0 means 0 ohm . They are used to jump but why do they jump a 5v line to the ground ? Does it make any sens at all ?

    look at the picture i have pointed out the problem.

    because since i have jump the fuse for the test with a very very small copper wire that blow under 1A and also removed the Resistance that was connecting the 5V to the ground . the TV works fine.

    I would like to understand how and why ... Pleae

    thank you
    Attached Files
    Last edited by Dpacro; 12-27-2010, 10:21 AM.
    Tags: None
    • Agent24
      I see dead caps
      • Oct 2007
      • 4977
      • New Zealand
      #2
      Re: Viewsonic fixed but I do not understand

      I am not sure and I hope someone else can help you.

      But I can say that whatever 0 ohm resistor was there that you removed, was obviously meant to be there (otherwise the TV would never work at all!) - I don't think it will be the cause of your fuse blowing, there will be some other problem.

      Replacing a fuse with some wire is not a good idea unless you know it will blow at the same current as the original fuse.

      I would not run the TV for any length of time in this state, you may be overheating something etc. You will need to find and fix the original fault.
      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
      -David VanHorn

        Comment

        • Dpacro
          Member
          • Dec 2010
          • 13
          #3
          Re: Viewsonic fixed but I do not understand

          Its what i want to find out.... but I do not get it. I will definitely replace the fuse by a real one this week.

            Comment

            • Agent24
              I see dead caps
              • Oct 2007
              • 4977
              • New Zealand
              #4
              Re: Viewsonic fixed but I do not understand

              Have you looked for a schematic? Perhaps that will make it make sense..
              "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
              -David VanHorn

                Comment

                • Dpacro
                  Member
                  • Dec 2010
                  • 13
                  #5
                  Re: Viewsonic fixed but I do not understand

                  i do not know where to find the schematics for this TV
                  Anyone can help ?

                    Comment

                    • Th3_uN1Qu3
                      Believe in
                      • Jul 2010
                      • 6031
                      • Romania
                      #6
                      Re: Viewsonic fixed but I do not understand

                      I don't think you will be able to find schematics. Anyway... if it works, leave it alone.
                      Originally posted by PeteS in CA
                      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                      A working TV? How boring!

                        Comment

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