Finlux 32FLD760P No picture

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  • mitsu79
    Member
    • Mar 2013
    • 14
    • Finland
    #1

    Finlux 32FLD760P No picture

    No picture, sound ok.
    Turns on from standby ok, backlight lids, but no picture, if I try to change channel or go to menu, backlight dims or brightens just a bit.
    This is elderly persons tv and I only have secondhand info about symptons before it went blank: Theres been picture problems from new, color problems, flickering? (not sure and not sure how to say this in english, but maybe, rapid picture movement left to right etc. from time to time). Picture have had lines and blurred unwatchable, before it went totally black.
    Could this be PSU issue and maybe be repaired with PSU repair kit or MB or something else?
    PSU: 17PW20.1
    MB:17MB22-2
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Finlux 32FLD760P No picture

      Very common issue with this PSU.
      Two major known issues:
      - C878/C877 capacitors fail (cheap and easy fix)
      - PFC circuit fail (causes main capacitor voltage to drop from 390V to 320~340V)

      The problem sounds more like C878/C877 personally to me.
      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

        • mitsu79
          Member
          • Mar 2013
          • 14
          • Finland
          #3
          Re: Finlux 32FLD760P No picture

          Thanks, what capacitance should C878/C877 capacitors have?

            Comment

            • gilly1984
              Badcaps Veteran
              • Jun 2012
              • 751
              • UK
              #4
              Re: Finlux 32FLD760P No picture

              15nf 1600v
              Do NOT touch heatsinks when testing for voltages as they may be LIVE!

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: Finlux 32FLD760P No picture

                  I've seen as low as 400V used on these PSUs... I would recommend min 800V 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

                    • mitsu79
                      Member
                      • Mar 2013
                      • 14
                      • Finland
                      #6
                      Re: Finlux 32FLD760P No picture

                      Ok, I'll try to measure them, if my multimeter have heated up over radiator, my garage thermometer says -6 celsius... outside about -20C

                      text on capacitors: mmkp82 153j630
                      Last edited by mitsu79; 03-14-2013, 06:35 PM.

                        Comment

                        • mitsu79
                          Member
                          • Mar 2013
                          • 14
                          • Finland
                          #7
                          Re: Finlux 32FLD760P No picture

                          Both capacitors were 34nF?

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: Finlux 32FLD760P No picture

                              Did you measure them in circuit?
                              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

                                • mitsu79
                                  Member
                                  • Mar 2013
                                  • 14
                                  • Finland
                                  #9
                                  Re: Finlux 32FLD760P No picture

                                  In circuit, yes.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK
                                      #10
                                      Re: Finlux 32FLD760P No picture

                                      Those you need to measure out of circuit.
                                      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

                                        • mitsu79
                                          Member
                                          • Mar 2013
                                          • 14
                                          • Finland
                                          #11
                                          Re: Finlux 32FLD760P No picture

                                          Ok, I'll remove and measure them again later today.

                                            Comment

                                            • mitsu79
                                              Member
                                              • Mar 2013
                                              • 14
                                              • Finland
                                              #12
                                              Re: Finlux 32FLD760P No picture

                                              C878/C877 were both 13,7, new ones I got measured 13,9.
                                              I think those old ones still work, only my multimeter ain't very accurate anymore.

                                              what shoud I check next?
                                              (I got repair kit including C801, C892, C901, C817, IC829, C877, C878, R817, R818,R819).

                                                Comment

                                                • mitsu79
                                                  Member
                                                  • Mar 2013
                                                  • 14
                                                  • Finland
                                                  #13
                                                  Re: Finlux 32FLD760P No picture

                                                  I replaced all but SMD resistors, they measured ok. 33uF condensator was 25uF, all other old parts measured more of less same as new ones(excluding transistor, not sure how to measure them). I'm somewhat sceptical, that problem were within these parts, but haven't got chance to test the PSU yet.

                                                    Comment

                                                    • mitsu79
                                                      Member
                                                      • Mar 2013
                                                      • 14
                                                      • Finland
                                                      #14
                                                      Re: Finlux 32FLD760P No picture

                                                      Tried it today, no differense, backlight turns on, but no picture.
                                                      I measured some voltages and I don't think that the problem is in PSU, what could i try next?

                                                        Comment

                                                        • tom66
                                                          EVs Rule
                                                          • Apr 2011
                                                          • 32560
                                                          • UK
                                                          #15
                                                          Re: Finlux 32FLD760P No picture

                                                          What voltages did you measure?
                                                          Did you check the voltage across the big 450V capacitor?
                                                          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

                                                            • mitsu79
                                                              Member
                                                              • Mar 2013
                                                              • 14
                                                              • Finland
                                                              #16
                                                              Re: Finlux 32FLD760P No picture

                                                              Main cap was 385V, others were 24,5v 12v 2v 3,3v 5v and yellow wire mentioned "https://www.badcaps.net/forum/showthread.php?t=25740&highlight=32FLD760P&page=2" post: 32, was 12v as it should.

                                                                Comment

                                                                • tom66
                                                                  EVs Rule
                                                                  • Apr 2011
                                                                  • 32560
                                                                  • UK
                                                                  #17
                                                                  Re: Finlux 32FLD760P No picture

                                                                  Those are good, so I would say looking elsewhere would be a good idea.
                                                                  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

                                                                    • mitsu79
                                                                      Member
                                                                      • Mar 2013
                                                                      • 14
                                                                      • Finland
                                                                      #18
                                                                      Re: Finlux 32FLD760P No picture

                                                                      I think so also.
                                                                      Which one is T-CON board and is it same as graphics board?

                                                                        Comment

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