Thermistor Replacement Substitute

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  • Glitcher
    Badcaps Veteran
    • Mar 2013
    • 673
    • USa
    #1

    Thermistor Replacement Substitute

    I have a Thermistor im looking to replace labeled SCK 0512 - looking up it says 5 ohm 12 A in a PSU.

    Is it possible to replace it with a different value? If so what's the general rule to do it?
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Thermistor Replacement Substitute

      5 Ohms will limit the maximum inrush current to 24A (if line voltage is 120V and load is 0 Ohms at start up). Is it used for feeding the bridge?
      http://www.bentex.com.hk/catalog/the.../ntc/sck.shtml
      Last edited by budm; 11-17-2013, 06:54 PM.
      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

        • Glitcher
          Badcaps Veteran
          • Mar 2013
          • 673
          • USa
          #3
          Re: Thermistor Replacement Substitute

          This is from a bn44-00222a PSU. There are two thermistors next to the failed relay. I don't have any replacements for it at the moment, but I do have SCK-206 (20 ohms 6A) but I'm not exactly sure how thermistors work.
          Attached Files
          Last edited by Glitcher; 11-17-2013, 07:12 PM.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Thermistor Replacement Substitute

              The thermistors should be bypassed as soon as the set begins operating, so the rating is more to prevent their failure rather than for the power supply to operate properly.
              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

                • Glitcher
                  Badcaps Veteran
                  • Mar 2013
                  • 673
                  • USa
                  #5
                  Re: Thermistor Replacement Substitute

                  I see, so choosing a higher ohm rated thermistor will further decrease the max current that can come through if there were to be a surge?

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: Thermistor Replacement Substitute

                      It would have no effect on a power surge.
                      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
                          #7
                          Re: Thermistor Replacement Substitute

                          So the relays failed to come on or the relays are not being turn 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

                            • Glitcher
                              Badcaps Veteran
                              • Mar 2013
                              • 673
                              • USa
                              #8
                              Re: Thermistor Replacement Substitute

                              One of the relays failed completely, (It was completely melted and burnt). I already replaced it though

                                Comment

                                • Kiriakos GR
                                  Banned
                                  • May 2012
                                  • 940
                                  • Greece
                                  #9
                                  Re: Thermistor Replacement Substitute

                                  You may use one 5W 0,22 Ohm for a quick test, if it works then buy the thermistor.
                                  Last edited by Kiriakos GR; 11-17-2013, 10:06 PM.

                                    Comment

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