Sharp lc-42sb45u power issue

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  • carltonfire176
    Member
    • Mar 2015
    • 19
    • United States

    #21
    Re: Sharp lc-42sb45u power issue

    Alastair E, Are these the right ones?

    http://www.digikey.com/product-detai...5535-ND/245134

    Comment

    • carltonfire176
      Member
      • Mar 2015
      • 19
      • United States

      #22
      Re: Sharp lc-42sb45u power issue

      or these?

      http://www.digikey.com/product-detai...0260-ND/266269

      Comment

      • carltonfire176
        Member
        • Mar 2015
        • 19
        • United States

        #23
        Re: Sharp lc-42sb45u power issue

        Wait... i just had to move the tv off of the kitchen table (where i work on most things, funny story: My grandfather used to rebuild volkswagen engines on the kitchen table, so its kind of a tradition in our family of using kitchen tables as a workbench) but before I did, I looked at the 4 capacitors

        the one that is domed is a 2700uf 16v
        then there are 2 680uf 50v capacitors, and the small one I was refering to earlier is a 1000uf 25v. So now im confused as to what to get

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Sharp lc-42sb45u power issue

          You should look at each cap, take notes on the Capacitance, Voltage rating, Diameter, Height and then look at Digikey for LOW ESR 105c caps that will fit into your board. I use PANASONIC FM/FC series for all my repair.
          Just look at the spec sheet to find what you need then type in the P/N into DIGIKEY search box.
          https://www.badcaps.net/forum/showpo...2&postcount=65
          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

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #25
            Re: Sharp lc-42sb45u power issue

            Originally posted by carltonfire176
            Alastair E, Are these the right ones?

            http://www.digikey.com/product-detai...5535-ND/245134
            These ones are "NHG" and are unsuitable for a power supply. The "FC" ones you link are 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

            • carltonfire176
              Member
              • Mar 2015
              • 19
              • United States

              #26
              Re: Sharp lc-42sb45u power issue

              I just placed my order through Mauser Electronics. Badcaps store, and Digikey did not stock the ones that I needed. Well Digikey did but they were back ordered until late may. I ordered the Panasonic FC capacitors from them after measuring the size of the capacitors and utilizing the chart budm pointed out to me. Thank you for all of your help guys! I really appreciate you all helping me! They should be here within the next 3-7 days so I'll be sure to let you all know when they arrive!

              Comment

              • carltonfire176
                Member
                • Mar 2015
                • 19
                • United States

                #27
                Re: Sharp lc-42sb45u power issue

                hey guys, the capacitors showed up in the mail today =)

                Comment

                • carltonfire176
                  Member
                  • Mar 2015
                  • 19
                  • United States

                  #28
                  Re: Sharp lc-42sb45u power issue

                  well i got the capacitors in tonight and like you said, it fired right up! =) so thanks for that but I ran into a new issue that I wish I had seen before... as far as i can tell there are 2 cracks in the display. Where should I go from here?

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #29
                    Re: Sharp lc-42sb45u power issue

                    Sell the boards for parts, forget about getting replacement LCD panel.
                    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

                    • bleed4me
                      Senior Member
                      • Nov 2015
                      • 122
                      • USA

                      #30
                      Re: Sharp lc-42sb45u power issue

                      So I picked up the same model TV as his showing same issue. TV would not power on with no standby light. When plugged in the unit didnt event have a relay click. Opened it up and went straight to the power board and the capacitor that was bad on his board is the exact same one that is bad on my board. Figured this would be a simple recap the board and this TV would be saved. I flipped the board and found something I had questions about before I ordered the caps. I guess my question would be what are those exactly and how would one test them to see if they are bad. It just looks like a bad spot and that solder is just too shiny or am I wrong? If anymore info is needed please let me know.

                      For future reference did I go upon this correctly as in to continue this thread or should I have started a new one?
                      Attached Files

                      Comment

                      • Five_magics
                        Member
                        • Apr 2016
                        • 47
                        • Canada

                        #31
                        Re: Sharp lc-42sb45u power issue

                        Originally posted by bleed4me
                        So I picked up the same model TV as his showing same issue. TV would not power on with no standby light. When plugged in the unit didnt event have a relay click. Opened it up and went straight to the power board and the capacitor that was bad on his board is the exact same one that is bad on my board. Figured this would be a simple recap the board and this TV would be saved. I flipped the board and found something I had questions about before I ordered the caps. I guess my question would be what are those exactly and how would one test them to see if they are bad. It just looks like a bad spot and that solder is just too shiny or am I wrong? If anymore info is needed please let me know.

                        For future reference did I go upon this correctly as in to continue this thread or should I have started a new one?
                        These are two resistors and a capacitor (You can see on the board it says RXXX (resistor) and CXXX (capacitor)). The resistors are the black ones with numbers, the beige one is a capacitor.

                        The resistors you can test with a multimeter that can test resistance(ohmmeter function). The capacitor you can check if shorted with check-diode/ohmmeter functions, and test the capacitance with a LC meter. You might have to take them out of circuit to get accurate measurements.

                        What you are looking at is a poor soldering/clean-up job. If you wanna fix it, you'll have to take the components off the board, wick the solder off the board, and solder the components back on. Doesn't mean it is at fault, chances are it's working, but whoever soldered there sucks at it.
                        Last edited by Five_magics; 04-20-2016, 12:15 AM.

                        Comment

                        • bleed4me
                          Senior Member
                          • Nov 2015
                          • 122
                          • USA

                          #32
                          Re: Sharp lc-42sb45u power issue

                          You really think somebody has been in the already and did some soldering ? You would think if they were to find a detail like that they would have seen the cap that was clearly bad. Pretty sure they didn't even consider the power board to be bad cause they told me the only thing they played with was the tcon board. Any chance this was caused by the board itself? As soon as I get home I will test them and see what comes of it. Thank you for your insight on this.

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #33
                            Re: Sharp lc-42sb45u power issue

                            BTW, that section you look at is the PFC Voltage booster circuit.
                            So do you get close to 400VDC between the two legs of the main filter cap when TV turned on?
                            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

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