Hisense lcd40v57ca buzzing

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  • kodiac
    Senior Member
    • Jul 2010
    • 116
    • Canada
    #1

    Hisense lcd40v57ca buzzing

    I would appreciate if someone could help me with a Hisense lcd40v57ca which has a buzzing sound from the back, that sounds like high voltage arching/escaping?
    A 390uF 250wv cap on the power supply board is swollen up on top.
    Also the tv will cycle on/off after it has been on awhile.

    Does anyone know where I can obtain a 390uF 250wv cap in Canada?

    Thank You
    Tags: None
    • kodiac
      Senior Member
      • Jul 2010
      • 116
      • Canada
      #2
      Re: Hisense lcd40v57ca buzzing

      Help Please?

        Comment

        • Pentium4
          CapXon Be Gone
          • Sep 2011
          • 3741
          • USA
          #3
          Re: Hisense lcd40v57ca buzzing

          You can find a cap in that size at Digi-Key. What was the original brand of the capacitor, and what are the dimensions of it? If the power board used cheap caps throughout it, while you're at it you might want to replace the rest of those too. Pictures are welcome

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Hisense lcd40v57ca buzzing

              Often the plastic dome of a capacitor can bulge without the capacitor being failed, if it has a plastic cover. If you can push the dome down flat, the capacitor is likely OK.
              Last edited by tom66; 09-29-2013, 04:39 PM.
              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

                • kodiac
                  Senior Member
                  • Jul 2010
                  • 116
                  • Canada
                  #5
                  Re: Hisense lcd40v57ca buzzing

                  Thank You.
                  Sorry for the picture quality.
                  LCD40V57CA
                  I have to open the TV again for the caps names.
                  Attached Files

                    Comment

                    • kodiac
                      Senior Member
                      • Jul 2010
                      • 116
                      • Canada
                      #6
                      Re: Hisense lcd40v57ca buzzing

                      The largest cap 390uF 250wv 105deg ( 3 cm x 3 cm ) which is bulged, is a brown SamYoung cap.
                      Others have TLC and S symbols.
                      The 390uF cap seems to be buzzing when the TV is On and emitting a whistle when the TV is Off/Standby.
                      When the TV is turned ON the buzzing begins and after approximately 15 min. the screen begins blinking periodically.
                      Does anyone have a list of good cap manufacturers.

                      Thank You.

                        Comment

                        • martino
                          Not so "senior"
                          • Aug 2013
                          • 997
                          • canada
                          #7
                          Re: Hisense lcd40v57ca buzzing

                          Originally posted by kodiac
                          Does anyone know where I can obtain a 390uF 250wv cap in Canada?

                          Thank You
                          Where in Canada are you?
                          Proud owner of dozens of broken TV's and many,many,many boards.


                          Our website and passion:http://hollenhundshepherds.com/

                            Comment

                            • kodiac
                              Senior Member
                              • Jul 2010
                              • 116
                              • Canada
                              #8
                              Re: Hisense lcd40v57ca buzzing

                              Bump

                                Comment

                                • Pentium4
                                  CapXon Be Gone
                                  • Sep 2011
                                  • 3741
                                  • USA
                                  #9
                                  Re: Hisense lcd40v57ca buzzing

                                  This will work:
                                  http://www.digikey.com/product-searc...=0&pageSize=25

                                    Comment

                                    • kodiac
                                      Senior Member
                                      • Jul 2010
                                      • 116
                                      • Canada
                                      #10
                                      Re: Hisense lcd40v57ca buzzing

                                      Thank You Sir.

                                        Comment

                                        • kodiac
                                          Senior Member
                                          • Jul 2010
                                          • 116
                                          • Canada
                                          #11
                                          Re: Hisense lcd40v57ca buzzing

                                          Is it true that increasing the voltage of a capacitor ( ex: 250wv to 350wv ) will shorten the life of the board.

                                            Comment

                                            • tom66
                                              EVs Rule
                                              • Apr 2011
                                              • 32560
                                              • UK
                                              #12
                                              Re: Hisense lcd40v57ca buzzing

                                              If anything the complete opposite. The capacitor voltage ratng is a maximum, not what it operates at.
                                              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

                                                • kodiac
                                                  Senior Member
                                                  • Jul 2010
                                                  • 116
                                                  • Canada
                                                  #13
                                                  Re: Hisense lcd40v57ca buzzing

                                                  Thank You

                                                    Comment

                                                    • tom66
                                                      EVs Rule
                                                      • Apr 2011
                                                      • 32560
                                                      • UK
                                                      #14
                                                      Re: Hisense lcd40v57ca buzzing

                                                      The main issue may be dimensions - check capacitor will fit before ordering. Compare dimensions on the Digikey page to the physical dimensions of the failed 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

                                                        • kodiac
                                                          Senior Member
                                                          • Jul 2010
                                                          • 116
                                                          • Canada
                                                          #15
                                                          Re: Hisense lcd40v57ca buzzing

                                                          Thank You

                                                            Comment

                                                            • kodiac
                                                              Senior Member
                                                              • Jul 2010
                                                              • 116
                                                              • Canada
                                                              #16
                                                              Re: Hisense lcd40v57ca buzzing

                                                              Does anyone have a list of good cap manufacturers.

                                                                Comment

                                                                • tom66
                                                                  EVs Rule
                                                                  • Apr 2011
                                                                  • 32560
                                                                  • UK
                                                                  #17
                                                                  Re: Hisense lcd40v57ca buzzing

                                                                  Panasonic, Rubycon, United/Nippon Chemi Con, Nichicon, Sanyo/Suncon, Fujitsu.
                                                                  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

                                                                    • kodiac
                                                                      Senior Member
                                                                      • Jul 2010
                                                                      • 116
                                                                      • Canada
                                                                      #18
                                                                      Re: Hisense lcd40v57ca buzzing

                                                                      Thank You

                                                                        Comment

                                                                        • kodiac
                                                                          Senior Member
                                                                          • Jul 2010
                                                                          • 116
                                                                          • Canada
                                                                          #19
                                                                          Re: Hisense lcd40v57ca buzzing

                                                                          Replaced 390uF 250wv cap ( with 300wv Panasonic from Digi-Key) in the power supply.
                                                                          Problem solved, no more buzzing.

                                                                            Comment

                                                                            • kodiac
                                                                              Senior Member
                                                                              • Jul 2010
                                                                              • 116
                                                                              • Canada
                                                                              #20
                                                                              Re: Hisense lcd40v57ca buzzing

                                                                              Anyone familiar with a pair of faint light horizontal lines moving up the LCD screen which are most visible on dark background or night time programs?
                                                                              I think these lines were called sound bars on older CRT televisions.

                                                                                Comment

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