Announcement

Collapse
No announcement yet.

noisy power from Viewsonic LCD screen 12V SMPS

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    noisy power from Viewsonic LCD screen 12V SMPS

    is there anyway to condition the output current from a Viewsonic LCD screen 12V SMPS??

    Can i pass the current through an array of (low esr+ polyesters) capacitors to filter some noise away?


    exactly this one
    Tags: None
    #2
    Re: noisy power from Viewsonic LCD screen 12V SMPS

    Probably a loose coil vibrating due to magnetorestriction. The coil needs to be glued.

    The trouble with these supplies is that they are welded shut. You can break them open but after repairing them you're going to need a lot of glue to stick them shut.

    A new supply can be found for less than $10, though...
    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

      #3
      Re: noisy power from Viewsonic LCD screen 12V SMPS

      not the sonic noise, actually I mean ripple current

      Comment

        #4
        Re: noisy power from Viewsonic LCD screen 12V SMPS

        Why do you think it's noise from the brick?
        .
        You can get junk on the screen by using video cables without a Ferrite.
        See pic.
        .
        Attached Files
        Mann-Made Global Warming.
        - We should be more concerned about the Intellectual Climate.
        -
        Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
        - Dr Seuss
        -
        You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
        -

        Comment

          #5
          Re: noisy power from Viewsonic LCD screen 12V SMPS

          He didn't say if he actually uses the supply for the monitor... maybe he's trying to power something else with it.
          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

            #6
            Re: noisy power from Viewsonic LCD screen 12V SMPS

            That's right.
            He didn't say - either way.
            .
            Mann-Made Global Warming.
            - We should be more concerned about the Intellectual Climate.
            -
            Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
            - Dr Seuss
            -
            You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
            -

            Comment

              #7
              Re: noisy power from Viewsonic LCD screen 12V SMPS

              Hi. I'm not sure of the actual problem you're having on this one on this one, but i'm assuming that by saying you want to remove noise from the display itself? Possibly a very slight blurring or shimmering of the picture ?

              If that's the case, it's possible that the fault is on the actual board at the rear of the screen, and no amount of other changes will affect it
              As a wild stab in the dark, i'd say . . . .

              Check the screens menu, and see if you can alter its phase settings from in there,

              or try a different PSU (i guess thats already been tried?),

              or, have a look at the back of the screen on its board, reseat all the connections.

              I've had a few older screens where they are even adjustable inside by a tiny pot, though i've not seen such a thing for a while on the bigger sizes now like 19 and above.

              With things like this, i usually just throw another screen in and see if it's doing the same. Any screen will do, though the picture may be off to the side, and if you use a widescreen for testing you'l only get a square picture instead, but all normal screens below 22 inch are interchangeable as long as the connections match (from what i've seen in the UK anyway).

              Comment

                #8
                Re: noisy power from Viewsonic LCD screen 12V SMPS

                I am using it for a 25W speaker amp.

                Read it first: I know all auidio guys will say use a toridal transformer instead. but there are 3 reasons for me to use smps.
                1. very convient, light weight
                2. efficient, low temperature.
                3. The most important point is I have achieved a very good result without a tiny trace of noise and hum before, using another 12 V SMPS. (1'm sure it's a smps)
                (borrowed from a router with longer 12V plug so that I have to put it back after a few weeks.)
                The only changed variable is the SMPS, so it cant be other things but the purity of 12V DC

                Comment

                  #9
                  Re: noisy power from Viewsonic LCD screen 12V SMPS

                  Crack or cut it open along the seam and re-cap it. Probably all it needs.
                  veritas odium parit

                  Comment

                    #10
                    Re: noisy power from Viewsonic LCD screen 12V SMPS

                    and some good supply bypass caps at the amp.
                    i see lots of these bricks die of bad caps.esp the ones on sanyo sets.
                    Originally posted by Toasty View Post
                    Crack or cut it open along the seam and re-cap it. Probably all it needs.

                    Comment

                    Previous template Next
                    Working...
                    X