Sharp lc-42sb45u power issue

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  • carltonfire176
    Member
    • Mar 2015
    • 19
    • United States

    #1

    Sharp lc-42sb45u power issue

    Ok. I was recently given a broken television for a project. It is a 42" Sharp lc-42sb45u. The guy who gave it to me said the tv would work for a little while and randomly shut itself down. After I picked it up and got it home, I plugged it in to test it. When I plugged it in and tried to turn it on, nothing happened.

    I checked the cord, and the connection to the tv and the wall. What should I do next?
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Sharp lc-42sb45u power issue

    Do you have a digital multimeter, and a camera?
    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

    • carltonfire176
      Member
      • Mar 2015
      • 19
      • United States

      #3
      Re: Sharp lc-42sb45u power issue

      I'm pretty sure I have one out in my toolbox, and as far as a camera goes I have one on my phone (galaxy s5)

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Sharp lc-42sb45u power issue

        OK could you remove the back cover of the TV and get us some clear photos of all of the boards inside the set. I use an S4 to take my photos so the S5 should be at least as good. Just make sure to get them in focus. A photo of your meter will also help.
        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

        • carltonfire176
          Member
          • Mar 2015
          • 19
          • United States

          #5
          Re: Sharp lc-42sb45u power issue

          sorry for the delay. I got caught up between work and fire calls I havent had a chance to mess with it too much. Anyway heres the pictures.

          My Multimeter


          Main board


          Power Supply


          Controller Board?


          And lastly the board behind the buttons, not sure what its called


          I used my multimeter last night and tested the resistance across the fuse above the power port. It tested at 6.5 so im assuming the fuse is good.

          Comment

          • jetadm123
            Badcaps Legend
            • Feb 2010
            • 2169

            #6
            Re: Sharp lc-42sb45u power issue

            Your 3rd photo shows the power supply. Is that large capacitor closest to the upper right wiring harness domed?

            Comment

            • carltonfire176
              Member
              • Mar 2015
              • 19
              • United States

              #7
              Re: Sharp lc-42sb45u power issue

              If this is the right one i circled it is

              Comment

              • Alastair E
                Chief Womble
                • Mar 2013
                • 1963
                • U.K.

                #8
                Re: Sharp lc-42sb45u power issue

                Yup--thats the one--Will need replacement.

                Check closely all the others for doming too, replace those that look domed.....
                TELEFIX

                How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                http://www.irf.com/technical-info/appnotes/an-1088.pdf
                PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Sharp lc-42sb45u power issue

                  One is already bad, you might as well replace them as a set including those on the inverter board (CMO).
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • carltonfire176
                    Member
                    • Mar 2015
                    • 19
                    • United States

                    #10
                    Re: Sharp lc-42sb45u power issue

                    thanks guys, ill look for the parts tonight. By replacing those, I should get power correct?

                    Comment

                    • carltonfire176
                      Member
                      • Mar 2015
                      • 19
                      • United States

                      #11
                      Re: Sharp lc-42sb45u power issue

                      is this what I need?

                      http://www.ebay.com/itm/CAP-DIODE-RE...item3386fc0dd9

                      Comment

                      • carltonfire176
                        Member
                        • Mar 2015
                        • 19
                        • United States

                        #12
                        Re: Sharp lc-42sb45u power issue

                        or this?

                        http://www.ebay.com/itm/CAPACITORS-p...07997657&rt=nc

                        Comment

                        • jetadm123
                          Badcaps Legend
                          • Feb 2010
                          • 2169

                          #13
                          Re: Sharp lc-42sb45u power issue

                          Try this:

                          http://www.ebay.com/itm/Sharp-LC42SB...item4d06c815df


                          Be sure to compare the capacitor values in the listing to the ones that are actually on your board. If there are differences, notify the seller and see if they will substitute the correct value.

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Sharp lc-42sb45u power issue

                            TBH I'd just get the caps from Digikey or if Topcat (site admin) stocks them, from badcaps.net store. It'll be cheaper and you'll be certain you're getting good, high quality replacements. If you need help choosing the right ones just ask.
                            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

                            • carltonfire176
                              Member
                              • Mar 2015
                              • 19
                              • United States

                              #15
                              Re: Sharp lc-42sb45u power issue

                              tom66, can you point out which ones for me. to be honest i have no idea what im looking for.

                              Comment

                              • carltonfire176
                                Member
                                • Mar 2015
                                • 19
                                • United States

                                #16
                                Re: Sharp lc-42sb45u power issue

                                I looked into them on the sites store. I have 2700uF 16volt caps on the board now but they are not listed in the master catalog.

                                Comment

                                • Alastair E
                                  Chief Womble
                                  • Mar 2013
                                  • 1963
                                  • U.K.

                                  #17
                                  Re: Sharp lc-42sb45u power issue

                                  Originally posted by carltonfire176
                                  I looked into them on the sites store. I have 2700uF 16volt caps on the board now but they are not listed in the master catalog.
                                  Use 3300uF 16V will be fine, 2700uF isnt a hugely popular value.....
                                  --The slight higher value wont make any difference where they are...
                                  TELEFIX

                                  How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                                  http://www.irf.com/technical-info/appnotes/an-1088.pdf
                                  PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                                  Comment

                                  • carltonfire176
                                    Member
                                    • Mar 2015
                                    • 19
                                    • United States

                                    #18
                                    Re: Sharp lc-42sb45u power issue

                                    okay! =) thank you. Also I noticed on the board that there are 4 capacitors but 1 of them is shorter than the other ones. Will that make a difference?

                                    Comment

                                    • carltonfire176
                                      Member
                                      • Mar 2015
                                      • 19
                                      • United States

                                      #19
                                      Re: Sharp lc-42sb45u power issue

                                      Also, 3300uF in a 16v are not listed on the sites store either. If i were to get them through digikey, which type would I need?

                                      Comment

                                      • Alastair E
                                        Chief Womble
                                        • Mar 2013
                                        • 1963
                                        • U.K.

                                        #20
                                        Re: Sharp lc-42sb45u power issue

                                        Not really, just match the component values reasonably closely.
                                        TELEFIX

                                        How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                                        http://www.irf.com/technical-info/appnotes/an-1088.pdf
                                        PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                                        Comment

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