Sharp LC-60LE810UN Repaired!

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  • jsgossett7
    New Member
    • Jul 2018
    • 2
    • USA

    #1

    Sharp LC-60LE810UN Repaired!

    My in-laws' TV went out, I helped them purchase another, but I decided to tinker with the old one just to see if by chance it was something simple. I am by no means an expert in electronics repair, so this site was extremely helpful. I found a blown fuse on the neutral side (circled bottom left in attached picture) was the issue all along and after replacing it, it is now up and running perfectly. I do have a few questions though, please.
    --Why is there a fuse on the neutral? I also wonder what could have blown it.
    --After I replaced the fuse, I plugged in the power supply with the back still off of the TV, and a "pop" and small flash came out of the left of the two black square components that I have a small scribbled circle on (top left in attached picture.) When this occurred, I expected I had blown a fuse again, so I was going to check the voltage of what I thought was the rectifier. I put my test probes on the two outside legs of the thing covered by a heat sink in the middle left portion of the attached picture, which I placed two red lines on to indicate. Is this the rectifier? When I touched the probes to those legs, a small arc occurred that scared the crap out of me.
    --I then decided to stop with the probing and hook it back up to see if it worked. Although I didn't expect it to, it did and has been working fine since.
    Thank you to all who contribute to this site. I found it very helpful, and I have since began trying to learn more about electrical components and theory.
    Attached Files
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9535
    • Canada

    #2
    Re: Sharp LC-60LE810UN Repaired!

    Resolder the connections on those 2 line chokes L7800 & L7801
    It looks like there could also be bad connections on the two diodes I maked in yellow, also check or resolder the connections on the bridge rectifier, and other components attached to heatsinks, and also check the transformer connections

    A fuse in the neutral could be there because if someone reversed the ac plug that point is now "line". it would'nt be the first time I saw the large blade of the plug filed down to fit an old 2 prong outlet
    Attached Files
    Last edited by R_J; 07-22-2018, 10:13 AM.

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    • SLK001
      Badcaps Veteran
      • May 2014
      • 264
      • USA

      #3
      Re: Sharp LC-60LE810UN Repaired!

      Originally posted by jsgossett7
      --Why is there a fuse on the neutral? I also wonder what could have blown it.
      The power supply is designed for up to 240V input (two hots) for countries outside the US. What caused it to blow? The power cord could have been plugged in backwards, either at the back of the set or the plug, making that fuse hot. That shouldn't hurt the set, but may be the reason for the blown fuse.

      Comment

      • RJARRRPCGP
        Badcaps Legend
        • Jul 2004
        • 6304
        • USA

        #4
        Re: Sharp LC-60LE810UN Repaired!

        Originally posted by SLK001
        (two hots)
        Looks like you only need two hots for 240V, for the Americas, Taiwan and Japan.

        The rest: Looks like, two hots, if using 460V or higher.

        We need two hots for 240V or the like, because each hot leg is only 120V (in the higher 120s in some regions)

        (or somewhat less, if connected to an ancient transformer)

        (The specs of 117V, 115V and 110V, obviously, are ancient American voltage specs!)
        Last edited by RJARRRPCGP; 07-22-2018, 07:05 PM.
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