HP EN623AA - static /blocky white areas

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  • retiredcaps
    Badcaps Legend
    • Apr 2010
    • 9271

    #21
    Re: HP EN623AA - static /blocky white areas

    Originally posted by torin3
    Your current one is LD1117AL 33AGFSL06. The datasheet suggests that the output current is 1A.

    http://pdf1.alldatasheet.com/datashe...5-TA3-A-R.html

    The one you chose is 1.2A. I don't know if that is enough of a difference, but try to find one that matches the datasheet exactly.
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    • jetadm123
      Badcaps Legend
      • Feb 2010
      • 2169

      #22
      Re: HP EN623AA - static /blocky white areas

      Originally posted by torin3
      Well, the 3.3V one when I started out was a rock steady 3.30V. When it started doing its weird video thing I read it as 3.33VDC it was gradually climbing. When it got to 3.38VDC I took the probes off, waited a few seconds and then checked again and got 3.39VDC.

      I went ahead and turned it off at that point.

      Should I leave it on longer and see when it stops?

      Should I just switch to the other voltage regulator now?

      Suggest that you at least also check the output of the 1.8V regulator.

      Comment

      • torin3
        Senior Member
        • Aug 2009
        • 178

        #23
        Re: HP EN623AA - static /blocky white areas

        Originally posted by retiredcaps
        Your current one is LD1117AL 33AGFSL06. The datasheet suggests that the output current is 1A.

        http://pdf1.alldatasheet.com/datashe...5-TA3-A-R.html

        The one you chose is 1.2A. I don't know if that is enough of a difference, but try to find one that matches the datasheet exactly.
        http://search.digikey.com/scripts/Dk...=497-1236-1-ND

        Closest I found at DigiKey was 950mA

        Originally posted by jetadm123
        Suggest that you at least also check the output of the 1.8V regulator.
        Ok. I'll post when I get the results.

        Comment

        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271

          #24
          Re: HP EN623AA - static /blocky white areas

          Originally posted by torin3
          Closest I found at DigiKey was 950mA
          I search with "3.3v 1a to-252" and got about 70 results. I chose this one

          http://search.digikey.com/scripts/Dk...P1117D33GCT-ND

          but I'll let others like PlainBill who have more experience with these jellybean parts to confirm.

          If you look around your junk or old boards, you may see this voltage regulator. For example, a lot of old sound cards I have noticed have 3.3, 2.5, and 1.8V regulators.
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          • retiredcaps
            Badcaps Legend
            • Apr 2010
            • 9271

            #25
            Re: HP EN623AA - static /blocky white areas

            BTW, on some of your monitors, you are getting static, fluctuating voltages, changed voltages. Any chance your source is bad? Or is this just coincidence?

            Do you have a UPS? Do you have multiple devices plugged into these circuits?
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            • torin3
              Senior Member
              • Aug 2009
              • 178

              #26
              Re: HP EN623AA - static /blocky white areas

              Originally posted by jetadm123
              Suggest that you at least also check the output of the 1.8V regulator.
              It started at 1.83V when I first turned it on, and is now up to 1.87V and the picture hasn't even started having problems yet.

              Edit: Seems to have stabilized at 1.87VDC. I'll check again when the diplay goes wonky.

              Edit2: It did go up to 1.88VDC before the display went wonky (about 3-4 minutes before). However when the display did go wonky, there was no additional voltage increase.

              Originally posted by retiredcaps
              BTW, on some of your monitors, you are getting static, fluctuating voltages, changed voltages. Any chance your source is bad? Or is this just coincidence?

              Do you have a UPS? Do you have multiple devices plugged into these circuits?
              Possibly. It is plugged into a UPS. Which runs my computer plus 2 monitors. It is a 1500VA unit. The additional monitor is also plugged in when testing them.
              Last edited by torin3; 12-18-2010, 06:53 PM.

              Comment

              • retiredcaps
                Badcaps Legend
                • Apr 2010
                • 9271

                #27
                Re: HP EN623AA - static /blocky white areas

                Originally posted by torin3
                It is plugged into a UPS. Which runs my computer plus 2 monitors. It is a 1500VA unit. The additional monitor is also plugged in when testing them.
                My UPS math is non existant. For fun, try testing the bad monitors on its own circuit and see what happens.
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                • retiredcaps
                  Badcaps Legend
                  • Apr 2010
                  • 9271

                  #28
                  Re: HP EN623AA - static /blocky white areas

                  Originally posted by torin3
                  It started at 1.83V when I first turned it on, and is now up to 1.87V and the picture hasn't even started having problems yet.
                  Odd, in the other thread, PlainBill says LDOs should be +/- 1%.

                  1.8 x 1.01 = 1.818
                  3.3 x 1.01 = 3.333

                  So are both regulator are out of spec? Or is this a symptom of something else?
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                  • torin3
                    Senior Member
                    • Aug 2009
                    • 178

                    #29
                    Re: HP EN623AA - static /blocky white areas

                    Originally posted by retiredcaps
                    My UPS math is non existant. For fun, try testing the bad monitors on its own circuit and see what happens.
                    It should handle a 750W load with ease.

                    Originally posted by retiredcaps
                    Odd, in the other thread, PlainBill says LDOs should be +/- 1%.

                    1.8 x 1.01 = 1.818
                    3.3 x 1.01 = 3.333

                    So are both regulator are out of spec? Or is this a symptom of something else?
                    Well, they aren't expensive units. I'll get a couple of each and replace them and then see where we are.

                    Comment

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