19" LCD Inverter fuse

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  • bbjunkie
    Badcaps Veteran
    • Dec 2011
    • 301
    #1

    19" LCD Inverter fuse

    Picked up a 19" Murphy LCD tv today, turns on and produces just sound. Checked for 2 seconds to black but it appeared that the CCFLs weren't lighting at all.

    Checked power going to inverter (pcb used is a FLY-IV190411 REV:1.0) found 12vdc and 4.3vdc so assumed power was getting there (this set uses a 12v brick type PSU)

    Looked closely at the inverter and found a SMD fuse, this was blown. Checked every semiconductor on the board, also checked transformers all showed ok - no shorts so I fitted a replacement fuse (very fine piece of wire, approx half as thick as 1A fuse wire) and the set it now working.

    My question is, there is no rating marked on the PCB - what value of fuse would be a sensible choice? I'd like to put a proper fuse in the inverter before I sell it on.

    (stock photo attached)

    SMD fuse is at 1 o'clock of the electrolytic cap beside the power connector.
    Attached Files
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    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: 19" LCD Inverter fuse

      Was there a letter written on the fuse?

      Power consumption of 19" LCD is about 40W, so estimate 80% of that as inverter so around 2.6A at 12V, maybe increase that a bit, 3.15A or 4A, just estimations but they should be fine. Remember though this fuse only has to protect against a short circuit failure not a long term over-current. And the power supply is most likely short circuit protected.
      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

        • FIXITNOW
          Senior Member
          • Jun 2008
          • 128
          • UK
          #3
          Re: 19" LCD Inverter fuse

          just got one of these same problem fuse marked with a large S and is about 1206 component size

            Comment

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9535
              • Canada
              #4
              Re: 19" LCD Inverter fuse

              That board at SJ has a (T) for fuse F1 which is a 5 amp
              S rating is 4 amp
              Usually fast acting 32 volt
              Last edited by R_J; 12-04-2018, 01:03 PM.

                Comment

                • FIXITNOW
                  Senior Member
                  • Jun 2008
                  • 128
                  • UK
                  #5
                  Re: 19" LCD Inverter fuse

                  thanks will upgrade it to a 5A

                    Comment

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