LG 50PQ30 PSPU-J806A keeps blowing fuse

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  • maiden790
    Senior Member
    • Nov 2014
    • 94
    • United States
    #1

    LG 50PQ30 PSPU-J806A keeps blowing fuse

    Hi guys need help with this power supply if you can suggest any issues..
    When I got this tv it wasn't powering on, just clicks a bunch
    so naturally I inspected the capacitors.
    I don't see any obvious damage/bulging to them.
    Then I tested the white axial ceramic fuse in front of the two largest capacitors which is a T4A H 250v, I realized that the fuse was blown. I bought a new fuse plugged it in and **bang** blew it again.
    The million dollar question is, whats causing this fuse to blow?
    -Mike
    Attached Files
    one mans is another ones treasure
    Tags: None
    • pk7tanner
      Senior Member
      • Apr 2013
      • 98
      • United States
      #2
      Re: LG 50PQ30 PSPU-J806A keeps blowing fuse

      From my experience with almost the exact same TV (50PQ20), your buffers boards, ysus, and zsus are bad. With those, it's a domino effect.

        Comment

        • maiden790
          Senior Member
          • Nov 2014
          • 94
          • United States
          #3
          Re: LG 50PQ30 PSPU-J806A keeps blowing fuse

          the buffer boards also look like they are fine however :/ anything else withen the main pcb that could cause this?
          one mans is another ones treasure

            Comment

            • maiden790
              Senior Member
              • Nov 2014
              • 94
              • United States
              #4
              Re: LG 50PQ30 PSPU-J806A keeps blowing fuse

              Okay, replaced the fuse again and this time i only had the Main PCB board hooked up ( as shown in picture. and the fuse still popped. so this tells me that the problem lies within the main pcb only. something on this board is making this fuse blow and im dying to figure it out. would really hate to buy an all new power supply for something silly that can be easily fixed.
              one mans is another ones treasure

                Comment

                • MagicSmoke
                  Badcaps Veteran
                  • Feb 2011
                  • 275
                  • USA
                  #5
                  Re: LG 50PQ30 PSPU-J806A keeps blowing fuse

                  Capacitors can be bad and not appear damaged or bulged. Diodes can be faulty and not show any evidence of failure. Mosfet's can be shorted and not show damage. These can blow fuses.

                  Power up the PSU without anything attached to it but AC power and see if fuse still pop's. If not then for sure problem is on main.

                  Without some basic testing you will just be throwing boards at it.

                    Comment

                    • maiden790
                      Senior Member
                      • Nov 2014
                      • 94
                      • United States
                      #6
                      Re: LG 50PQ30 PSPU-J806A keeps blowing fuse

                      ive powered up the psu without hooking it up to the other boards and narrowed it down to just that. im taking out the transistors as we speak to test them
                      one mans is another ones treasure

                        Comment

                        • maiden790
                          Senior Member
                          • Nov 2014
                          • 94
                          • United States
                          #7
                          Re: LG 50PQ30 PSPU-J806A keeps blowing fuse

                          having such a damn difficult time getting the solder out of this board, might just take the hit and buy a new board smh
                          one mans is another ones treasure

                            Comment

                            • andyfisk
                              New Member
                              • Jan 2015
                              • 8
                              • US
                              #8
                              Re: LG 50PQ30 PSPU-J806A keeps blowing fuse

                              Any progress? I'm working on the same issue in a Sanyo DP50749... Tv turns on (can hear relays click) then turns itself back off... no backlight, no sound.

                              Thanks!
                              -Andy-

                                Comment

                                • maiden790
                                  Senior Member
                                  • Nov 2014
                                  • 94
                                  • United States
                                  #9
                                  Re: LG 50PQ30 PSPU-J806A keeps blowing fuse

                                  I ended up just replacing the power supply, I found out a bunch of resistors were blown On the power supply. Might want to check that!
                                  one mans is another ones treasure

                                    Comment

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