LG 50PC3D-UD plasma power issues

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  • crbn79
    Senior Member
    • Feb 2011
    • 64
    #1

    LG 50PC3D-UD plasma power issues

    I have an LG 50PC3D-UD which I am having problems with the power supply. The previous owner replaced the power supply with an alternate replacement board. I obtained the TV when the Y Buffer boards started to go out.

    While I was troubleshooting the system with the back panel off two mosfets overheated and blew the secondary fuse on the power supply. The mosfets also shorted. I replaced both mosfets and the fuse but still no power up.

    When I do a power up voltage test I'm not getting 3.4v from 2 connections which I should be. On the pictures those would be p801 2nd 3.4v from bottom, and p802 3.4v. All other voltages show what they should.

    I have tested with the Y board disconnected, with the Z board disconnected and also with both boards disconnected.

    I also noted that I get no change if I remove the secondary fuse and power on. I've tested the fuse and changed it 3 times just to be sure.
    Attached Files
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    • crbn79
      Senior Member
      • Feb 2011
      • 64
      #2
      Re: LG 50PC3D-UD plasma power issues

      Here are a couple more pictures which show the replaced mosfets and paths on backside. Thanks in advance for any help here.

      Also, the power supply was replaced with an alternate supply by a previous owners repair. It is the power supply from a 50PC5D.
      Attached Files
      Last edited by crbn79; 04-23-2013, 11:06 AM.

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