had to get longer caps for a tv power board. possibly problematic.

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  • Uranium-235
    Comrade Glimmer
    • Aug 2007
    • 5042
    • US
    #1

    had to get longer caps for a tv power board. possibly problematic.

    hey guys I got this ILO TV to recap. Already recapped once a year ago by someone else, but judging by the glue around two smaller caps, those two smaller ones were it, also I saw some flux near them.

    It had a barely bloated 450/100, and a second 450/100 that was actually kind of burned ontop. It was close to a mosfet heatsink, and when I started to get it unglued, one of the legs literally fell of without much pushing. I looked and the hole had brown dried up lytic shit that somehow, weakened the leg, or eroded the leg. Mouser was out of any 35mm replacements (unless i wanted to wait till 1/22/13) so I had to get a 40mm. Its still close. any idea of how I can help insulate the top?
    Attached Files
    Cap Datasheet Depot: http://www.paullinebarger.net/DS/
    ^If you have datasheets not listed PM me
    Tags: None
    • Uranium-235
      Comrade Glimmer
      • Aug 2007
      • 5042
      • US
      #2
      Re: had to get longer caps for a tv power board. possibly problematic.

      um bump, help?
      Cap Datasheet Depot: http://www.paullinebarger.net/DS/
      ^If you have datasheets not listed PM me

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: had to get longer caps for a tv power board. possibly problematic.

          You can use some electrical tape as insulator, or HV insulating glue.
          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

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: had to get longer caps for a tv power board. possibly problematic.

              What do you have around in your house? Any Silicone adhesive?
              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

                • Uranium-235
                  Comrade Glimmer
                  • Aug 2007
                  • 5042
                  • US
                  #5
                  Re: had to get longer caps for a tv power board. possibly problematic.

                  I don't believe so. I have hot glue. Can I put a big dab of hot glue ontop of the cap? to help deflect heat? I'll search around next time i'm at frys
                  Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                  ^If you have datasheets not listed PM me

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: had to get longer caps for a tv power board. possibly problematic.

                      Hot glue tends to break off, it is very brittle. You can try it, or you can deal with the fact that ~5mm requires approx 7kV to arc over in ~60% RH air, so it is unlikely to fail on a PSU dealing with 400V max.
                      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

                        • Uranium-235
                          Comrade Glimmer
                          • Aug 2007
                          • 5042
                          • US
                          #7
                          Re: had to get longer caps for a tv power board. possibly problematic.

                          i'm not 100% on what you are talking about, but if you mean electric arc, thats not what i'm afraid of. I'm afraid of constant heat from the sink slowly heating up that cap, the cap top is literally about ~4-5mm from the sink, and when I say the old one was burnt, I mean from heat
                          Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                          ^If you have datasheets not listed PM me

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: had to get longer caps for a tv power board. possibly problematic.

                              Then an insulator will make it worse.

                              What kills caps is not so much external heat, but internal heat from ripple current. The original didn't fail due to the heat externally, but due to the excessive ripple from being undersized.

                              A good cap will be fine.
                              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

                                • randtek
                                  Badcaps Veteran
                                  • Oct 2011
                                  • 280
                                  • US
                                  #9
                                  Re: had to get longer caps for a tv power board. possibly problematic.

                                  Originally posted by tom66
                                  Then an insulator will make it worse.

                                  What kills caps is not so much external heat, but internal heat from ripple current. The original didn't fail due to the heat externally, but due to the excessive ripple from being undersized.

                                  A good cap will be fine.
                                  Here is a technical document from Panasonic Industrial that gives useful information about ambient temperature effects on electrolytic caps. One important conclusion from this document is that ambient temperature and proximity to heat producing components are important considerations pertaining to the life expectancy of electrolytics. Use Techniques of Aluminum Electrolytic Capacitors

                                    Comment

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