How to test a DLP Ballast

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  • electronicsurplus
    Badcaps Veteran
    • Jun 2012
    • 210
    • USA
    #1

    How to test a DLP Ballast

    Does anyone know how to check a ballast in a DLP or Inverter in a LCD?

    Is this even possible?

    What would I use to test the output? I have High Voltage Probe. The type we used to use to test old Flybacks in CRT

    Can anyone help shed some light on this?

    Since, currently, the only way we can test is to install in a known working television to verify.

    But, I am sure there must be some way to drive the Ballast or Inverter to test it's output and functionality

    I am sure this will help a lot of people

    Thanks

    Jon
    This Forum absolutely the best and, the most helpful forum I have ever found anywhere. thanks to all the fantastic members here
    Help keep these from the landfills
    Tags: None
    • ratdude747
      Black Sheep
      • Nov 2008
      • 17136
      • USA
      #2
      Re: How to test a DLP Ballast

      Moved out of a FAQ thread.

      It wasn't even on topic man... Unless you are a veteran member posting a legitimate and often asked for "How-to Guide" thread, Don't post in the FAQ.
      sigpic

      (Insert witty quote here)

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: How to test a DLP Ballast

          Use an LCR meter and measure inductance if you like, but the simplest test should be for continuity - it should be a short at DC.
          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

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870
              #4
              Re: How to test a DLP Ballast

              I dont think I have seen more than 3 posts re DLP Tvs on here. I did find a partial test for Ballast but nothing on testing the output. The input from the power supply should be in the region of 350-400vdc
              Pull the lamp housing
              Tie the door switch up to the closed position
              Turn on the TV
              All Fans should run, Color wheel should spin listen or shine a flashlight in the lamp side window to verify
              Watch at the left back side of the Ballast board for the starter to flash it will cycle flash three times
              Pull power cord from back of TV to shut off or it will continue to try the three attempt cycle.

              Regarding Inverter transformers other than spare bulbs or
              a tester (which is just a bulb) there doesnt seem to be
              a measurable output test.We tend to try and measure primary and secondary windings and check the input voltage.
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: How to test a DLP Ballast

                  Most DLP lamps are around 20 to 50V, I thought... Maybe more for more recent ones?
                  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

                    • electronicsurplus
                      Badcaps Veteran
                      • Jun 2012
                      • 210
                      • USA
                      #6
                      Re: How to test a DLP Ballast

                      Thank you
                      tom66 and selldoor for the input
                      This Forum absolutely the best and, the most helpful forum I have ever found anywhere. thanks to all the fantastic members here
                      Help keep these from the landfills

                        Comment

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