Philips 50PFP5532D - X-main issue??

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: Philips 50PFP5532D - X-main issue??

    Can you post a clear shot of your Y-main, including around the Yfr (or Vfr, or Y-FR) adjustment point?
    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.

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    • tn245
      Badcaps Veteran
      • Oct 2013
      • 530
      • UK

      #22
      Re: Philips 50PFP5532D - X-main issue??

      Here you go..
      Attached Files

      Comment

      • tn245
        Badcaps Veteran
        • Oct 2013
        • 530
        • UK

        #23
        Re: Philips 50PFP5532D - X-main issue??

        bump..

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: Philips 50PFP5532D - X-main issue??

          I'm not seeing obvious points for Vset, where did you test it before? (Yset at 0.1V?)
          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

          • tn245
            Badcaps Veteran
            • Oct 2013
            • 530
            • UK

            #25
            Re: Philips 50PFP5532D - X-main issue??

            Here, over on the right by the connector to the control board.
            Attached Files

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            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #26
              Re: Philips 50PFP5532D - X-main issue??

              That's the enable signal (pulses on and off, very high, difficult to measure with meter), unfortunately not the Vset voltage. Did you try before to adjust the Y-RR and Y-FR controls to see if they have much effect on the picture?
              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

              • tn245
                Badcaps Veteran
                • Oct 2013
                • 530
                • UK

                #27
                Re: Philips 50PFP5532D - X-main issue??

                I don't have a Yrr control. I have Yfr, Vscan and Yset controls. Yfr and Vscan do affect the picture and I can reduce the sparklies, but there is still a lot of distortion in the picture - especially pixels either not filling in or not going out when they should. Yset does nothing at all.

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #28
                  Re: Philips 50PFP5532D - X-main issue??

                  Adjusting Yset should definitely cause a change in picture quality. I'm trying to find a thread before, I do remember someone on this forum having this issue, and they replaced one of the FETs on the Y-Main near the Yfr potentiometer as it was bad.
                  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

                  • tn245
                    Badcaps Veteran
                    • Oct 2013
                    • 530
                    • UK

                    #29
                    Re: Philips 50PFP5532D - X-main issue??

                    Thanks for the suggestion. I've taken out the Y-main. Haven't found any shorted FETs (tested in-circuit) but the fuse F5200 you can see in the attached is o/c. So something must be wrong up here.
                    Attached Files

                    Comment

                    • tn245
                      Badcaps Veteran
                      • Oct 2013
                      • 530
                      • UK

                      #30
                      Re: Philips 50PFP5532D - X-main issue??

                      .. also I think I found the thread you mentioned:
                      https://www.badcaps.net/forum/showth...t=24844&page=7

                      Tomorrow I might try taking out that K2837 and testing it out of circuit.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #31
                        Re: Philips 50PFP5532D - X-main issue??

                        That's the one! Good find.
                        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

                        • tn245
                          Badcaps Veteran
                          • Oct 2013
                          • 530
                          • UK

                          #32
                          Re: Philips 50PFP5532D - X-main issue??

                          The mosfet seems ok. No shorts and switching on fine. The only odd behaviour is it switches off very quickly even if gate is not discharged. But I compared it with another k2837 from another part of the board and same behaviour. I can't find any other shorted components in that part of the board.

                          Would I be crazy to try just replacing the blown fuse? Do these fuses ever just go for no reason like smd ones sometimes do?

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #33
                            Re: Philips 50PFP5532D - X-main issue??

                            Fuses can sometimes blow without cause, but it's rare on a sustain board like this. You have little to lose from trying, though.
                            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

                            • tn245
                              Badcaps Veteran
                              • Oct 2013
                              • 530
                              • UK

                              #34
                              Re: Philips 50PFP5532D - X-main issue??

                              Hah! I replaced the fuse and now it works! Had to make a small adjustment on Yfr to get rid of some residual sparklies but now the picture is perfect.

                              It's possible the fuse blew while I was first making adjustments to get rid of sparklies, because I think the picture got way worse after that.

                              So thanks so much tom66 in particular for your guidance!

                              Do you think it's worth replacing any FETs or other components for longevity's sake? It would be nice if the next owner could get a good long life out of it.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #35
                                Re: Philips 50PFP5532D - X-main issue??

                                That's great to hear. One of the mods I would suggest would be heatsinks on all buffer chips. You can get ones used for RAM on graphics cards or raspberry pi boards. Thermal epoxy can be used to secure them. A fan over the Y-main area may also help.
                                Last edited by tom66; 11-06-2013, 08:44 AM.
                                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

                                • tn245
                                  Badcaps Veteran
                                  • Oct 2013
                                  • 530
                                  • UK

                                  #36
                                  Re: Philips 50PFP5532D - X-main issue??

                                  Thanks for the suggestions, I'll definitely do that.

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #37
                                    Re: Philips 50PFP5532D - X-main issue??

                                    Make sure the fan sucks from bottom of case to top, not the other way around. Otherwise you're fighting normal convection cooling.
                                    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

                                    • tn245
                                      Badcaps Veteran
                                      • Oct 2013
                                      • 530
                                      • UK

                                      #38
                                      Re: Philips 50PFP5532D - X-main issue??

                                      Well, sadly I'm back to this TV with more questions.

                                      I've just finished putting heatsinks on the buffers. Also replaced the fuseholder with the proper littelfuse. However, when I put it all back together and power on I now suddenly get nothing. The same fuse is blowing, but rather than the messed up image I had before I've got a black screen. There's also a strange noise coming from the y-main - halfway between a buzz and a crackle, not loud.

                                      Tested voltages again. Va and Vs are ok. Ve at first goes to the proper 94V, but then within seconds of turning on jumps to 137V. It does this with y-main disconnected and not. Vscan also starts off at the proper high negative but then quickly drops.

                                      What have I done??

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #39
                                        Re: Philips 50PFP5532D - X-main issue??

                                        Is it possible your heatsinks on your buffers are shorting something out?
                                        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

                                        • tn245
                                          Badcaps Veteran
                                          • Oct 2013
                                          • 530
                                          • UK

                                          #40
                                          Re: Philips 50PFP5532D - X-main issue??

                                          It's possible. I will investigate. Is that normal for Ve to go that high with y-main disconnected?

                                          Comment

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