LG 50PQ10 Broken PSU

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  • dcapper
    Badcaps Veteran
    • Dec 2013
    • 496
    • Canada
    #1

    LG 50PQ10 Broken PSU

    I picked this tv up and someone thought they could fix it by changing the YSUS since it had a tvpartsguy sticker on it. But whomever looked at it missed the obvious. The PSU had a huge crack in it. Before I found the crack the red led on the front would just blink. Now that it's fixed it stays solid and the tv won't turn on. The control board blinks 4 times as soon as I plug the tv in then it goes to a long blink and a short blink over and over again. I don't have Va but I'm assuming it's because the tv won't turn on. Any ideas? Or what the blinks mean?
    Attached Files
    Tags: None
    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain
      #2
      Re: LG 50PQ10 Broken PSU

      So you fixed the broken traces on the psu ? If so got images ?
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • tw2005
          Badcaps Legend
          • Oct 2011
          • 6458
          • Australia
          #3
          Re: LG 50PQ10 Broken PSU

          No, but this training guide may assist given the PQ10,20,30 share some boards like the Logic.

          It suggests if it'sblinking the logic board is most likely ok.

          Maybe go the auto-gen where the main is completely disconnected, jumper the auto-gen, plug in and tv should turn on automatically and have test patterns.
          Attached Files

            Comment

            • dcapper
              Badcaps Veteran
              • Dec 2013
              • 496
              • Canada
              #4
              Re: LG 50PQ10 Broken PSU

              I've done lots of trace repairs. TW, I looked at the training manual but it didn't tell me much about the blinks. I posted a pic of the trace repairs and metered them.

              EDIT: There is no jumper pins for the gen test. I'll solder some in and post back if I get the pattern.
              Attached Files
              Last edited by dcapper; 02-20-2016, 05:09 PM.

                Comment

                • dcapper
                  Badcaps Veteran
                  • Dec 2013
                  • 496
                  • Canada
                  #5
                  Re: LG 50PQ10 Broken PSU

                  LVDS cable off and jumper on. No change. Solid red power light, no power, and no test pattern. I metered all the transistors, diodes, and resistors on the psu. I haven't metered the caps yet, but I think there is more with this.

                    Comment

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6458
                      • Australia
                      #6
                      Re: LG 50PQ10 Broken PSU

                      I know what's wrong here, LG...Long Gone?

                        Comment

                        • dcapper
                          Badcaps Veteran
                          • Dec 2013
                          • 496
                          • Canada
                          #7
                          Re: LG 50PQ10 Broken PSU

                          Hehe. Or is it Lousy Garbage. You and me are Panny guys. I'm going to see if I can bypass the mainboard to get voltages to the Ysus and Xsus. I am not getting my Va or Vs anywhere. I double checked my solder connections and they are fine. I don't see any shorted parts either. I might just buy a new psu. They are actually fairly cheap for this model.

                          EDIT: Still no voltages with the psu test. There must be more wrong with the psu.
                          Attached Files
                          Last edited by dcapper; 02-20-2016, 06:45 PM.

                            Comment

                            • tw2005
                              Badcaps Legend
                              • Oct 2011
                              • 6458
                              • Australia
                              #8
                              Re: LG 50PQ10 Broken PSU

                              Originally posted by dcapper
                              Hehe. Or is it Lousy Garbage. You and me are Panny guys. I'm going to see if I can bypass the mainboard to get voltages to the Ysus and Xsus. I am not getting my Va or Vs anywhere. I double checked my solder connections and they are fine. I don't see any shorted parts either. I might just buy a new psu. They are actually fairly cheap for this model.

                              EDIT: Still no voltages with the psu test. There must be more wrong with the psu.
                              Wonder how the PSU got cracked in the first place

                                Comment

                                • dcapper
                                  Badcaps Veteran
                                  • Dec 2013
                                  • 496
                                  • Canada
                                  #9
                                  Re: LG 50PQ10 Broken PSU

                                  Honestly, I don't remember when I got the tv or how I got it. I just checked the back for it. It's metal and there is no dents. Like I said in an earlier post, someone was tinkering in the tv. The Ysus was replaced for sure. I'm wondering if the old Ysus blew the psu? I'm going to do more in depth metering this week. I'm not getting any voltages besides my 5v. I double checked my solder repair and they are all metering properly.

                                    Comment

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