viewsonic vp201s screen goes bad after 5 minutes

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  • paulmars
    Member
    • May 2011
    • 31
    • usa

    #1

    viewsonic vp201s screen goes bad after 5 minutes

    after about 5 minutes screen goes all horizontal lines. power supply caps look good. No bulges or leaking. 17.75vdc power supply output before and after 5 minutes.

    Ideas?

    Tks,
    <pa
  • retiredcaps
    Badcaps Legend
    • Apr 2010
    • 9271

    #2
    Re: viewsonic vp201s screen goes bad after 5 minutes

    Originally posted by paulmars
    Ideas?
    Point a cooling fan to the back of the lcd and see if the lines appear after 5 minutes or not.
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    • paulmars
      Member
      • May 2011
      • 31
      • usa

      #3
      Re: viewsonic vp201s screen goes bad after 5 minutes

      48 minutes and all is fine. Turned off fan and 20 more minutes still ok. Case is HOT. Note that display was laying face down during this test.

      Comment

      • retiredcaps
        Badcaps Legend
        • Apr 2010
        • 9271

        #4
        Re: viewsonic vp201s screen goes bad after 5 minutes

        I would suspect a bad solder joint. Take a magnifying glass or 10x jewelers loupe and looking ring cracks or suspect joints (especially if this board is lead free solder).

        See

        http://workmanship.nasa.gov/lib/insp...uirements.html

        and

        https://www.badcaps.net/forum/showpo...7&postcount=17

        for examples of poor soldering.
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        • paulmars
          Member
          • May 2011
          • 31
          • usa

          #5
          Re: viewsonic vp201s screen goes bad after 5 minutes

          I been studying it for 1 hour now and i got a headache. Pic attached. I took a hi res pic, but max allowed is 1.91 MB, so I reduce it.
          Attached Files

          Comment

          • retiredcaps
            Badcaps Legend
            • Apr 2010
            • 9271

            #6
            Re: viewsonic vp201s screen goes bad after 5 minutes

            You can try the opposite and use a hair dryer to warm up a small section of the board at one time.
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            • paulmars
              Member
              • May 2011
              • 31
              • usa

              #7
              Re: viewsonic vp201s screen goes bad after 5 minutes

              I dont understand.

              Comment

              • retiredcaps
                Badcaps Legend
                • Apr 2010
                • 9271

                #8
                Re: viewsonic vp201s screen goes bad after 5 minutes

                If it takes 5 minutes for the lines to appear normally and longer with a cooling fan, then if you heat up the board, the lines should appear in less than 5 minutes if you heat up the correct section of the board.

                That would help narrow down which component or solder joint is questionable.
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                • paulmars
                  Member
                  • May 2011
                  • 31
                  • usa

                  #9
                  Re: viewsonic vp201s screen goes bad after 5 minutes

                  ok, got it. Now I need to borrow a hair dryer...This may take awhile. I shall return with the results.

                  Comment

                  • cadillacman
                    Badcaps Veteran
                    • Feb 2011
                    • 524

                    #10
                    Re: viewsonic vp201s screen goes bad after 5 minutes

                    you might want to see if yours has one of those damn ics like mine did and remove it for testing purposes. show us a pic of the other side of the mainboard.
                    Last edited by cadillacman; 05-12-2011, 10:17 PM.

                    Comment

                    • paulmars
                      Member
                      • May 2011
                      • 31
                      • usa

                      #11
                      Re: viewsonic vp201s screen goes bad after 5 minutes

                      attached
                      Attached Files

                      Comment

                      • paulmars
                        Member
                        • May 2011
                        • 31
                        • usa

                        #12
                        Re: viewsonic vp201s screen goes bad after 5 minutes

                        Im still searching for a dryer. Meanwhile, Im using the monitor with the rear cover removed. Its been on for 2 hours and will is well.

                        Comment

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