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LG RU-42PZ71, No Power

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    LG RU-42PZ71, No Power

    TV won't turn on at all, no status light or anything. This TV has a mechanical switch but it seems to work good, I'm getting a 110V reading on the first fuse. But all of the outputs on the power board come up at zero volts.

    I've checked the fuse on the power board, two on the Y-sustain (one glass, one surface mount), and three on the Z-sustain (two ceramic on surface mount). All seem good, and I haven't found any other fuses. I'm not sure what I could test now, but is it safe to say the problem is with the power board?

    Boards pictured in order are:
    Power Board
    Y-Sustain
    Z-Sustain
    Digital Video Board
    Main AV Board
    Logic Control Board
    (Not Pictured: Left and Right X Buffer Boards)
    Attached Files

    #2
    Re: LG RU-42PZ71, No Power

    Any suggestions? I've never had one that just didn't output anything from the PSU, I'm not sure what else I could test.

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      #3
      Re: LG RU-42PZ71, No Power

      Check for shorted diodes on the heatsinks.
      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.

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