LG 50px4dr-ua Plasma: no picture

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  • deanrantala
    New Member
    • Apr 2013
    • 2
    • United States
    #1

    LG 50px4dr-ua Plasma: no picture

    Overview of issue:

    Unit powers on, hard drive spins up, power lights on front turn green.

    Everything seems to be "on", but screen remains black.

    Initial actions taken:

    -> Checked all fuses
    -> Did a basic voltage test (Vs, Vg, etc). all seem to be on-spot. Vg was over by about 3 volts - nothing major.
    -> Inspected for bad caps, burnt devices, etc

    I am about to hunt down the service manual for this, hopefully it is as complete as Panasonic service manuals are.

    Anyone have any similar experience with these LG sets? Thoughts?

    Thanks in advance!
    Tags: None
    • johnboy1313
      Badcaps Legend
      • Nov 2012
      • 1959
      • USA
      #2
      Re: LG 50px4dr-ua Plasma: no picture

      http://www.tgohome.com/ServiceManual...h=Submit+Query

        Comment

        • deanrantala
          New Member
          • Apr 2013
          • 2
          • United States
          #3
          Re: LG 50px4dr-ua Plasma: no picture

          Awesome link, much more info than the initial SM I found.

          I think I have narrowed things down to a bad ZSUS or YSUS board. This is a known issue on these TV's.

          I have found some mixed direction that mentions the buffers or other boards also needing to be replaced, but cannot confirm. Many reports mention official LG service techs also replacing the power supply board.

          I sure cannot imagine the PS board being bad - all voltages measure good up to the YSUS and VSUS boards.

          I have ordered both YSUS and ZSUS boards ($8/each, guaranteed to work from reputable dealer on ebay!). Time will tell if this fixes things.

          Will post back.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: LG 50px4dr-ua Plasma: no picture

              $8 each for YSUS and ZSUS? Bargain!
              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

                • Scuse
                  Senior Member
                  • Jan 2013
                  • 50
                  • United States
                  #5
                  Re: LG 50px4dr-ua Plasma: no picture

                  Have you received your boards yet? My boss had this same tv and gave it to me cause he said it was broken. It starts up and you can barely see any light on the screen but the black slowly fades away in about ten minutes. Then if you turn all the picture settings all the way up you can see the picture but its a very poor picture. very dirty, fuzzy, and grainy. And still not that bright. Sound works perfectly. I checked a few voltages so far and the power board is all good, and like you said one was up 2 or 3 volts but nothing major. I was thinking the ysus or zsus also especially since I was measuring voltages spiking on the ysus heatsinks at between 200-400 volts. I see you're from TN too. They must've sent all the bad ones here.

                    Comment

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