Lg 60PK550 Problem

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  • fireproof710
    Senior Member
    • Dec 2013
    • 56
    • USA

    #41
    Re: Lg 60PK550 Problem

    Any further conclusions about that mystery capacitor?

    Comment

    • freakaftr8
      Badcaps Legend
      • Oct 2012
      • 3743
      • USA

      #42
      Re: Lg 60PK550 Problem

      Im still lost on it. 1800v seems rather odd for a capacitor in a SMPS. Im more thinking that 1.8KHP is a 10% tolerance notation. But the 223H may in fact be .022uf

      Someone else needs to chime in on this one. A well known supplier of components buddy of mine is even lost on what that cap means...
      Did I leave the soldering iron on?

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #43
        Re: Lg 60PK550 Problem

        I have heard of 1250V capacitors, it's not too much of a stretch to imagine a 1800V capacitor existing...
        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

        • fireproof710
          Senior Member
          • Dec 2013
          • 56
          • USA

          #44
          Re: Lg 60PK550 Problem

          Would it be conceivable to consult a technical diagram of the power board to find the specs? We have a betacam deck at work from back in the day that came with a hefty manual that diagramed every board in detail. Would a similar document exist for a tv?

          Comment

          • fireproof710
            Senior Member
            • Dec 2013
            • 56
            • USA

            #45
            Re: Lg 60PK550 Problem

            I had somebody tell me it was a 22uf 1800v. I emailed a few component supply places and asked if they could help ID it.

            Comment

            • fireproof710
              Senior Member
              • Dec 2013
              • 56
              • USA

              #46
              Re: Lg 60PK550 Problem

              Digi-Key got back to me. They too think its a .022uf 1800v. They said the closest thing they had was a 2000v, but its leads are probably too short to install in the same location. Would installing a cap with a higher voltage rating screw everything up?

              http://www.digikey.com/product-detai...235-ND/1532455

              Waiting to hear back from Mouser and Jameco.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #47
                Re: Lg 60PK550 Problem

                Higher voltage rating will be fine. You could break the leads off a resistor and solder them to the leads of that capacitor as replacements.
                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

                • fireproof710
                  Senior Member
                  • Dec 2013
                  • 56
                  • USA

                  #48
                  Re: Lg 60PK550 Problem

                  Cool, I'll give that one a try. In summary, I will be ordering/replacing:

                  1) The suspected faulty mosfet and the one next to it that is the same type.

                  2)The high voltage mylar cap.

                  3)The small caps near the heat sink and all of the other small caps on the board while I'm at it.

                  Before I place the order, is there anything else I should consider replacing?

                  Comment

                  • fireproof710
                    Senior Member
                    • Dec 2013
                    • 56
                    • USA

                    #49
                    Re: Lg 60PK550 Problem

                    Do the mosfets need thermal paste on them for contact with the heat sink? If so any recommendations?

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #50
                      Re: Lg 60PK550 Problem

                      Yes. Generic thermal paste hasn't failed me yet.

                      You should also replace the IC which drives those FETs, if there is one on that board, otherwise, they may fail immediately on power up. Picture of underside of board near FETs?

                      Consider building a lightbulb test jig: https://www.badcaps.net/forum/showthread.php?t=32748
                      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

                      • fireproof710
                        Senior Member
                        • Dec 2013
                        • 56
                        • USA

                        #51
                        Re: Lg 60PK550 Problem

                        I'll snap a pic of the underside when I get home. What exactly is an IC?

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #52
                          Re: Lg 60PK550 Problem

                          Integrated circuit -- will be in charge of driving the MOSFETs.
                          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

                          • fireproof710
                            Senior Member
                            • Dec 2013
                            • 56
                            • USA

                            #53
                            Re: Lg 60PK550 Problem

                            Ah, makes sense. I'll report back once I'm home and get a pic.

                            Comment

                            • fireproof710
                              Senior Member
                              • Dec 2013
                              • 56
                              • USA

                              #54
                              Re: Lg 60PK550 Problem

                              This is the nearest IC. All of them are pretty dang small and are all soldered straight to the board. I'd have to get a hefty magnifying glass to read the markings on it.
                              Attached Files

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #55
                                Re: Lg 60PK550 Problem

                                That would be a suspect, I would advise replacing it.
                                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

                                • fireproof710
                                  Senior Member
                                  • Dec 2013
                                  • 56
                                  • USA

                                  #56
                                  Re: Lg 60PK550 Problem

                                  Okay. I'll order the other parts so I can get some soldering practice in. God knows I'll need it for those leads on the IC. I'll report back once I've gotten a magnifying glass I can use to read the markings on the IC.

                                  Comment

                                  • fireproof710
                                    Senior Member
                                    • Dec 2013
                                    • 56
                                    • USA

                                    #57
                                    Re: Lg 60PK550 Problem

                                    Okay. Got the parts. Swapped them out. Still works intermittently. Still makes clicking noise (though more static/click hybrid sounding) from the same area. I got a loupe and looked at the numbers on the IC. It looks to be an "ST" brand circuit There are two rows of markings one at the top that I could faintly and not concretely make out as "L6591AU"
                                    The other string of characters is below and to the right of the ST logo and is indecipherable. Nothing comes up in google for the numbers that I think are stamped on there. I'm wondering if I should just get a new board at this point. I found one on ebay here:

                                    http://www.ebay.com/itm/LG-POWER-SUP...p2054897.l4275

                                    It looks to be the same numbers except my PCB number is: EAX61432501/6
                                    and the one on ebay is EAX61432501/10

                                    Thoughts?

                                    Comment

                                    • fireproof710
                                      Senior Member
                                      • Dec 2013
                                      • 56
                                      • USA

                                      #58
                                      Re: Lg 60PK550 Problem

                                      I found another one cheaper and with the exact number match. I think I'm going to go for it.

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #59
                                        Re: Lg 60PK550 Problem

                                        Missed your post, but L6591 is probably the part #. Did you replace that chip yet? It can be difficult, but if you can remove it, then you can put it back on. No harm trying if you're going to get a new board anyway.
                                        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

                                        • fireproof710
                                          Senior Member
                                          • Dec 2013
                                          • 56
                                          • USA

                                          #60
                                          Re: Lg 60PK550 Problem

                                          Thanks for the reply. Googling L6591AU returned no results but leaving off the "AU" gave me what appears to be an AC/DC circuit with the same number of pins as the one on my board.

                                          http://www.digikey.com/product-detai...art_dkc_buynow

                                          I'll give it a go.
                                          Last edited by fireproof710; 01-13-2014, 08:04 AM. Reason: dang grammar errors.

                                          Comment

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