LG 50PS60 No picture no sound

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  • rogue409
    New Member
    • Oct 2014
    • 7
    • USA
    #1

    LG 50PS60 No picture no sound

    My LG 50PS60 just died with no picture, no sound. Here's what I've done so far to troubleshoot (following Tom66's guide).

    1. Disconnect Ysus: Still no picture, with partially working sound. It seems to about 1/3rd of the music.
    2. Disconnect Zsus: Red/pink tinted picture with sparklies and fully functioning sound.
    3. Checked voltages at the PSU
    5v: 5.05V
    VA: Spec 65, Actual 64.4V
    VS: Spec 194, Actual 194.2

    Seems like a problem with Zsus, what do you all think?

    I have a pile of pics that I can post, but I'm not sure which ones will be most helpful. If I can figure out which board is causing the problem, I'll probably replace it instead of troubleshooting further. My soldering skills are non-existent.
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: LG 50PS60 No picture no sound

      Z-sustain is a very common fault on this model.
      The fix is reasonably complicated, there are repair services available online. Or you can replace the whole board.
      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

        • rogue409
          New Member
          • Oct 2014
          • 7
          • USA
          #3
          Re: LG 50PS60 No picture no sound

          Originally posted by tom66
          Z-sustain is a very common fault on this model.
          The fix is reasonably complicated, there are repair services available online. Or you can replace the whole board.
          Thanks for the confirmation! I'll update when I replace the Z-sustain.

            Comment

            • rogue409
              New Member
              • Oct 2014
              • 7
              • USA
              #4
              Re: LG 50PS60 No picture no sound

              Replaced the Z-sus board. Powered it up....and got a little puff of smoke from the new Z-sus. Major bummer.

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: LG 50PS60 No picture no sound

                  Sounds like your new zsus was anything but. Where did you buy it from? Did you have all screws installed? Was the rubber pad in the bottom installed too?
                  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

                    • rogue409
                      New Member
                      • Oct 2014
                      • 7
                      • USA
                      #6
                      Re: LG 50PS60 No picture no sound

                      Originally posted by tom66
                      Sounds like your new zsus was anything but. Where did you buy it from? Did you have all screws installed? Was the rubber pad in the bottom installed too?
                      I bought it from ebay. I installed about half of the screws -- I'm guessing that's not good.

                      With the "new" broken board in, the tv powers up but has little sparklies.
                      Last edited by rogue409; 10-21-2014, 06:53 AM.

                        Comment

                        • Alastair E
                          Chief Womble
                          • Mar 2013
                          • 1963
                          • U.K.
                          #7
                          Re: LG 50PS60 No picture no sound

                          Unfortunately--Looks like your Z-SUS died because all the earthing screws were not in place.....

                          The screws and the pads on the board earth the tracks to the chassis. If some are not present can have odd effects--or destruction of the boards
                          TELEFIX

                          How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                          http://www.irf.com/technical-info/appnotes/an-1088.pdf
                          PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                            Comment

                            • rogue409
                              New Member
                              • Oct 2014
                              • 7
                              • USA
                              #8
                              Re: LG 50PS60 No picture no sound

                              Originally posted by Alastair E
                              Unfortunately--Looks like your Z-SUS died because all the earthing screws were not in place.....

                              The screws and the pads on the board earth the tracks to the chassis. If some are not present can have odd effects--or destruction of the boards
                              ....as I found out last night.

                                Comment

                                • rogue409
                                  New Member
                                  • Oct 2014
                                  • 7
                                  • USA
                                  #9
                                  Re: LG 50PS60 No picture no sound

                                  Replaced Z-sus and everything works! Thanks everyone!

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK
                                      #10
                                      Re: LG 50PS60 No picture no sound

                                      Glad to hear, these are pretty good TVs.
                                      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

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