technika 42 lcd 910 power probs

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  • exmortis
    Member
    • Feb 2013
    • 27
    • u.k

    #21
    Re: technika 42 lcd 910 power probs

    Originally posted by tom66
    You need to use low-esr capacitors. Farnell sell them as do RS. Capacitors from the average shop can cause lots of issues. Good capacitors to use are Panasonic FC, FM or FR.
    ok i have some others now good ones i try them instead now and keep ya posted many thanks

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: technika 42 lcd 910 power probs

      Which ones do you have? Brand and series? Seriously, most capacitors are NOT suitable.
      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

      • exmortis
        Member
        • Feb 2013
        • 27
        • u.k

        #23
        Re: technika 42 lcd 910 power probs

        Originally posted by tom66
        Which ones do you have? Brand and series? Seriously, most capacitors are NOT suitable.
        they where capcon ones same as removed , tv does the same , and i checked the 24v to the invertor and they do get a feed briefly then the tv clicks back off and the voltage drops off.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: technika 42 lcd 910 power probs

          Capxon are really poor capacitors.... I've replaced more of them than any other...
          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

          • exmortis
            Member
            • Feb 2013
            • 27
            • u.k

            #25
            Re: technika 42 lcd 910 power probs

            Originally posted by tom66
            Capxon are really poor capacitors.... I've replaced more of them than any other...
            ok if i sort them what would be the next step to test ? iam stuck now on what to check.

            Comment

            • exmortis
              Member
              • Feb 2013
              • 27
              • u.k

              #26
              Re: technika 42 lcd 910 power probs

              Originally posted by exmortis
              ok if i sort them what would be the next step to test ? iam stuck now on what to check.
              what about Rubycon capacitors ?

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #27
                Re: technika 42 lcd 910 power probs

                They are very good, but you can get a lot of fakes if you buy from shady shops, let us know the series (e.g. ZLH, YXF, MCZ) before replacing them as we need to know if they are low esr (not all Rubycon caps are.)
                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

                • exmortis
                  Member
                  • Feb 2013
                  • 27
                  • u.k

                  #28
                  Re: technika 42 lcd 910 power probs

                  Originally posted by tom66
                  They are very good, but you can get a lot of fakes if you buy from shady shops, let us know the series (e.g. ZLH, YXF, MCZ) before replacing them as we need to know if they are low esr (not all Rubycon caps are.)
                  they are MCZ are the series anygood

                  Comment

                  • exmortis
                    Member
                    • Feb 2013
                    • 27
                    • u.k

                    #29
                    Re: technika 42 lcd 910 power probs

                    would increasing the microfarad on the replacements cause a issue i.e going from 470 to 1500 same voltage tho ?

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #30
                      Re: technika 42 lcd 910 power probs

                      Yes, almost certainly. And, MCZ are not suitable for TV PSU.
                      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

                      • exmortis
                        Member
                        • Feb 2013
                        • 27
                        • u.k

                        #31
                        Re: technika 42 lcd 910 power probs

                        Originally posted by tom66
                        Yes, almost certainly. And, MCZ are not suitable for TV PSU.
                        what next thing i can test once the caps are sorted ?

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #32
                          Re: technika 42 lcd 910 power probs

                          We can check the output rails and main board.
                          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

                          • exmortis
                            Member
                            • Feb 2013
                            • 27
                            • u.k

                            #33
                            Re: technika 42 lcd 910 power probs

                            Originally posted by tom66
                            We can check the output rails and main board.

                            ok i been testing and checking components , i found a 4.7Mohm resister open circult which i replaced has resolved the buzzing issues from power supply, still remains in standby, i just been testing Mosfets on invertor and found n channel bottom 4 are at fault model fdd8447l 40v , iam right in saying they operate similar to diodes back to back and only allow current one way through ?

                            Comment

                            • vinceroger69
                              Badcaps Legend
                              • Mar 2012
                              • 6714
                              • uk

                              #34
                              Re: technika 42 lcd 910 power probs

                              http://howtoblogpost.blogspot.co.uk/...st-mosfet.html

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #35
                                Re: technika 42 lcd 910 power probs

                                That is stolen verbatim from 4QD.
                                http://www.4qd.co.uk/serv/MOSFETfail.html
                                http://www.4qdtec.com/mostest.html
                                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

                                • exmortis
                                  Member
                                  • Feb 2013
                                  • 27
                                  • u.k

                                  #36
                                  Re: technika 42 lcd 910 power probs

                                  Originally posted by tom66
                                  yeah i think the 4 mosfets on the invertor next to the 2 caps are knackered i have to get some and change them and see what happens

                                  Comment

                                  • vinceroger69
                                    Badcaps Legend
                                    • Mar 2012
                                    • 6714
                                    • uk

                                    #37
                                    Re: technika 42 lcd 910 power probs

                                    Originally posted by tom66
                                    sure is stolen a good testing guide though tom can these be tested in circuit or have to lift the fets legs? i am never sure

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #38
                                      Re: technika 42 lcd 910 power probs

                                      In circuit is usually OK, once a suspicious device is located, remove it from the circuit and test 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

                                      • exmortis
                                        Member
                                        • Feb 2013
                                        • 27
                                        • u.k

                                        #39
                                        Re: technika 42 lcd 910 power probs

                                        Originally posted by tom66
                                        In circuit is usually OK, once a suspicious device is located, remove it from the circuit and test out of circuit.
                                        anyone got 4x FDD8447l mosfets they can send us in the post, cant get any at the mo

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK

                                          #40
                                          Re: technika 42 lcd 910 power probs

                                          *cough*
                                          http://www.ebay.co.uk/sch/i.html?_tr...at=0&_from=R40
                                          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

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