Agora AGR-19-822-COB, Backlight Fault

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  • Jackplug 123
    Retired tech
    • May 2016
    • 65
    • United Kingdom
    #1

    Agora AGR-19-822-COB, Backlight Fault

    Hi,
    I use this as a 19 inch CCTV monitor,via the SCART socket.
    Last night after power up, worked for a few seconds,then shut down.
    Standby light flashing orange and a chirp from the power supply transformer.
    Normal standby is blue,power on is orange.
    Power Board is Vestel 17ips16-4 version 20522876.
    Checked diodes D814,D815,D817,D818 and startup cap C807 33UF/50V all OK.

    Wisp of smoke from 8 pin smd chip near CCFL back-light driver transformer.
    On power down and power up, TV will go to standby and power up with no back-light.
    Evidence of Menu on screen seen albeit lit by a torch.

    Question.
    Could the CCFL arrays be faulty?, if so is there a way to test them with a power supply and if so what voltage?
    I test LED backlights via a 30 volt DC power supply,so straight forward.
    Obviously the power board is visually faulty,are these still available?
    Don't have access to rework SMD devices.
    Cheers
    Steve
    Attached Files
    Last edited by Jackplug 123; 04-10-2023, 10:19 AM.
    Tags: None
    • thommyX
      Senior Member
      • Apr 2016
      • 93
      • Germany
      #2
      Re: Agora AGR-19-822-COB, Backlight Fault

      IC102 (FSD8962C)

      LG Thomas

        Comment

        • Jackplug 123
          Retired tech
          • May 2016
          • 65
          • United Kingdom
          #3
          Re: Agora AGR-19-822-COB, Backlight Fault

          Hi,
          Managed to download schematic for power board.
          IC102 listed as FDS8962C
          Can you confirm type number?
          Cheers

            Comment

            • Jackplug 123
              Retired tech
              • May 2016
              • 65
              • United Kingdom
              #4
              Re: Agora AGR-19-822-COB, Backlight Fault

              Have ordered some FDS8962C chips which are complimentary pair mosfet packages.
              Also ordered CCFL tester.
              If both CCFL tubes are faulty, is an LED conversion straightforward bearing in mind the current power board is a Vestel 17ips16-4.
              Am thinking of supply, standby and brightness control arrangements.
              Thoughts guys?

                Comment

                • Jackplug 123
                  Retired tech
                  • May 2016
                  • 65
                  • United Kingdom
                  #5
                  Re: Agora AGR-19-822-COB, Backlight Fault

                  Finally sussed fault and after a lot of fun and games dismantling the LCD screen discovered a burnt electrode arcing to chassis on one of the CCFL tubes.Replaced with LED backlight kit with driver board.Connected 12v supply,Ground,Dimmer and Enable lines off power board header to signal board.The power board is a Vestel 17ips16-4.What I need to do now it to disable the inverter, can anyone tell me which component to remove to disable its power feed please?

                    Comment

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