HP L1710 starts fine then solid white after a few seconds

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  • Diablo_Rojo
    Member
    • Dec 2009
    • 28
    #1

    HP L1710 starts fine then solid white after a few seconds

    I am having some trouble figuring what is going on with this. If someone has any ideas I would be grateful. I measure a consistent 5.2V at video board. When I first turn it on it works for maybe 15 seconds then solid white. If I turn it off and back on it works a little while shorter each time. No bulging caps on either board. I went a head and replaced one 470u 16V Elite on the PSU 5V rail with a 470u 25V Nichicon.
    Thanks in advance.
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    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: HP L1710 starts fine then solid white after a few seconds

      Check voltage regulators U701 and U702. List the part number for each and measure the DC voltage on each pin with respect to ground.

      Measure the voltage when the signal is good and then when it is white.
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        • Diablo_Rojo
          Member
          • Dec 2009
          • 28
          #3
          Re: HP L1710 starts fine then solid white after a few seconds

          Thanks for the fast reply. U701 is a 17-33L it has 5.2V in and 3.3V out . U702 is a 17-18L with a 5.2V in and 1.8V out. These voltages are the same when screen is working and when white.

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271
              #4
              Re: HP L1710 starts fine then solid white after a few seconds

              Originally posted by Diablo_Rojo
              U701 is a 17-33L it has 5.2V in and 3.3V out . U702 is a 17-18L with a 5.2V in and 1.8V out.
              Those readings look good. The only other suggestion I have at the moment is to replace the remaining caps on the logic board and retest.
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                Comment

                • retiredcaps
                  Badcaps Legend
                  • Apr 2010
                  • 9271
                  #5
                  Re: HP L1710 starts fine then solid white after a few seconds

                  The cable from the logic board to the panel might be bad/loose as well?
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                    Comment

                    • Diablo_Rojo
                      Member
                      • Dec 2009
                      • 28
                      #6
                      Re: HP L1710 starts fine then solid white after a few seconds

                      Thanks for the ideas. I have reseated the cable from the logic board to the panel several times with no improvement. I will replace the caps on the logic board and report back.

                        Comment

                        • Rtech
                          Badcaps Legend
                          • Jul 2010
                          • 1095
                          #7
                          Re: HP L1710 starts fine then solid white after a few seconds

                          The fault is regularly associated with a problem on the 'tag board', thats the one at the top,attached to the screen.Suggest you check fuse/s on that.

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