viewsonic vx2255wmb-2 2 seconds to black

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  • pookie21
    Member
    • Oct 2012
    • 11
    • australia

    #1

    viewsonic vx2255wmb-2 2 seconds to black

    Hi to all you great people on this forum.
    Firstly i turn on monitor and it flashes image then goes to orange.Did not try flashlight trick at this stage.Disassembled monitor and had visual inspection.I noticed high voltage ceramic caps c506 and c523 are burnt and have turned green(should be blue)and all caps looked ok. I ignored this and replaced caps X12 except 150/420v.
    Reassembled and whilst connected to my pc turned on and now screen flashes but this time blue light remains constant.Yes i can see image with flashlight.Well i thought i had achieved something ?. Got monitor apart again now and am trying to identify parts and learn how to test.Firstly the 150/420v capacitor reads 137.7 capacitance is this acceptable ?. Cannot get one yet from parts store.Secondly the two high voltage ceramic caps c506 and c523 which i have removed give me no reading no matter what i try with multimeter? .The markings on ceramic are both 10p3kv.It is my first attempt at this so would appreciate any help from here.Have attached photo (same as) but not my photo .In the meantime i am reading through forum to get any knowledge that will help me. Max [email]sangwa2001@yahoo.com[
    Attached Files
    Last edited by pookie21; 11-03-2012, 10:53 PM. Reason: cannot see attachment
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: viewsonic vx2255wmb-2 2 seconds to black

    Those are ballast caps for the lamps, very low capacitance, you need to check and see if it has any leakage resistance at all, your meter should show OL at the highest Ohm setting.
    Do they all have 10p3kv printing on them?
    It is 10pf 3000V, if it has resistance leakage, then the lamps will draw too much current which will cause the inverter to shutdown to protect itself.
    When these caps start leaking, they will get hot and the body will have light brown color:
    http://s807.photobucket.com/albums/y...nt%20FLX-3210/

    Replacement cap:
    http://www.mouser.com/ProductDetail/...ABWWD1BTwl8p83

    These Viewsonic VX series have a lot of bad caps problem just like any other brand as you can see here.
    http://s807.photobucket.com/albums/y...udm/VIEWSONIC/

    The 150uf 420V, how good is the cap meter? can it also read ESR? You may want to replace it. If you have meter with TRUE R.M.S reading, then set to AC and read the AC ripple on that 150uF cap, it should be 1~2VAC or less.
    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

    • pookie21
      Member
      • Oct 2012
      • 11
      • australia

      #3
      Re: viewsonic vx2255wmb-2 2 seconds to black

      Thanks Budm for the quick reply.Have a Digitech qm1496 and all known good caps i check are within capacitance stated on caps.No sorry do not have esr meter. With the exception of the 150/420v which gives me 137.7 everytime. Do i test ballast caps off board? I have the repair manual and schematics but still trying to get my head round the info.
      I will wait for reply before i unsolder ballast caps for testing.
      thank you very much.Max

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: viewsonic vx2255wmb-2 2 seconds to black

        Yes, test those ballast caps off the board, if you have doubt about them, I would replace them since they can cause damage to the inverter transformers. Your meter does not put out high enough voltage for really find out if the caps are bad for sure, but if you can read resistance with you meter which can only put out less than 10V, just think what will happen when those caps are exposed to 2000V in the circuits.
        Last edited by budm; 11-04-2012, 12:40 AM.
        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

        • pookie21
          Member
          • Oct 2012
          • 11
          • australia

          #5
          Re: viewsonic vx2255wmb-2 2 seconds to black

          Thanks again budm, my friend can locate the parts in question and i will replace them anyway.I will also do the tests you told me.I will let you know the results.

          Comment

          • pookie21
            Member
            • Oct 2012
            • 11
            • australia

            #6
            Re: viewsonic vx2255wmb-2 2 seconds to black

            Hi budm, just went to my local store and they only have 10nf3k .Mine are 10pf3k could i use them temporarily to see if any result.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: viewsonic vx2255wmb-2 2 seconds to black

              That is too much capacitance, it will let the lamps draw more current than they should, so the inverter may go into shut down.
              10nF = 0.01uf
              10pF = 0.00001uF
              So that cap is 1000 time higher value than the original!
              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

              • pookie21
                Member
                • Oct 2012
                • 11
                • australia

                #8
                Re: viewsonic vx2255wmb-2 2 seconds to black

                Thank you budm. Will wait to get correct values. Bit annoyed that the salesman said yea they'll be ok mate. Max

                Comment

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