benq fp783 help

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  • milstr
    New Member
    • Feb 2010
    • 2
    #1

    benq fp783 help

    Hi folks,
    I need shematic diagram of inverter board because I have two small IC's (8 pin) totaly burned I don't know what is it. I can see only number 4431 on it and it's all.
    Thank's .
    Tags: None
    • FIXITNOW
      Senior Member
      • Jun 2008
      • 128
      • UK
      #2
      Re: benq fp783 help

      these are Si4431

      try google search for data sheet

        Comment

        • Krankshaft
          Badcaps Legend
          • Jan 2007
          • 2328
          • USA
          #3
          Re: benq fp783 help

          The 4431s are backlight On/Off FETs made by Vishay Siliconix. Try Farnell for them I think they have a warehouse in the UK.

          They blew because one of the inverter driver transistors shorted also be sure to check the inverter fuse. If it's a Benq build and it uses those FETs the drivers are probably 2SC5707s. Also resolder all of the inverter transformer pins replace any bad brand caps on the secondary the Benq builds I worked with used Elite crapacitors.

          Usually both of the FETs don't blow only one does (the one in the same circuit with the shorted driver). You may be looking at 2 failed driver transistors or something external caused this failure like badly cracked transformer joints or the monitor was hit by some kind of power surge.
          Last edited by Krankshaft; 02-04-2010, 11:30 AM.
          Elements of the past and the future combining to make something not quite as good as either.

            Comment

            • milstr
              New Member
              • Feb 2010
              • 2
              #4
              Re: benq fp783 help

              Thank's All,
              I try all steps mentioned above and then we will see )

                Comment

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