LG Plasma fuse blown.

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  • Scottmac
    New Member
    • Nov 2014
    • 3
    • Australia
    #1

    LG Plasma fuse blown.

    G'day to all from the top end of Australia. First post, I hope somebody can give me some advice.

    My TV died last night. It is an LG 50PT250 Plasma. I have traced the problem to a fuse on the PSU card. The fuse is a 5A soldered into the card.
    Can't see any other burnt out or damaged components on any of the cards.

    Where can I source another fuse to suit?
    Do they blow for no reason occasionally, or is it likely there will be further problems down the line?
    I have sourced a new PSU board on eBay for 80 bucks, should I just get that?

    Also when I checked for voltage at the outlet it was 250v. Shouldn't be that high.Nominal voltage here is 240Vac. (I'm an electrician). It was checked on a cheap meter I keep in my boat, so maybe not real accurate.
    Is 250vac high enough to start damaging electronic components?

    Cheers for any advice, Scotty.
    Last edited by Scottmac; 11-10-2014, 06:15 PM.
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: LG Plasma fuse blown.

      Fuses -rarely- blow without obvious cause. That's not to say it doesn't happen, but it is very rare.

      You can try testing some other parts if you have a multimeter. Otherwise replacing the power board ought to fix the fault.
      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
          #3
          Re: LG Plasma fuse blown.

          Perhaps the battery is going in your meter - that might account for the 250v reading.
          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
              #4
              Re: LG Plasma fuse blown.

              250V is ok for most 230V devices, including TVs. Up to 253V is ok in a 230V/240V nominal country, devices are tested to 265V.
              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

                • Scottmac
                  New Member
                  • Nov 2014
                  • 3
                  • Australia
                  #5
                  Re: LG Plasma fuse blown.

                  Thanks for the replies guys. I have ordered the new PSU and will check out the old one as time allows, although there isn't any obvious damage to the caps etc.

                    Comment

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