How to bypass an auto shut off?

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  • Regent
    Computer Tech
    • Dec 2011
    • 32
    • Canada

    #1

    How to bypass an auto shut off?

    I have an electric blanket that as an auto shut off after an hour! I want to use the blanket to warm up my flower seedling and I need it to always be on.
    Can anyone tell me if the auto shut off is on the circuit board or in the blanket itself? And can I bypass this annoying problem?
    Attached Files
    Last edited by c_hegge; 02-16-2014, 09:55 PM. Reason: No need for such big text
  • Regent
    Computer Tech
    • Dec 2011
    • 32
    • Canada

    #2
    Re: How to bypass an auto shut off?

    I did some research & I found that on the circuit board (as shown in the photo) there is a 3 pin ZTT 4.00MG ceramic resonator (blue) & they sometime can be use as a timer. Can someone confirm if this is where the one hour auto shut off is?
    By the way, the reason why this company (coz-e) as an auto shut off after an hour is in case you fall asleep. It as nothing to do with temperature control.

    Comment

    • goontron
      5000!
      • Dec 2011
      • 4108
      • US

      #3
      Re: How to bypass an auto shut off?

      I don't see why or how a resonator could be used in a temp control circuit.
      it is safe to assume that will either stop the auto shutdown or stop the unit from coming on at all.
      Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

      "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

      Excuse me while i do something dangerous


      You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

      Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

      Follow the white rabbit.

      Comment

      • Longbow
        Badcaps Veteran
        • Jun 2011
        • 623
        • USA

        #4
        Re: How to bypass an auto shut off?

        If the blanket is controlled by a uPC, the 4 MHz resonator is the main clock. Many processors will also use a secondary 32KHz clock crystal to time the serial bus and for real time displays, etc. I doubt if a blanket is that complex. Slowing one or both of the crystals might delay the shut-off depending upon the circuit, but the auto shut off itself will still happen because it is programmed into the software.

        Even though it is tempting to use an electric blanket, it is a bad choice for use around water (plants) and you have very little control over the heat. Have a look a silicone heating strips. This solution is ideal for use around water and the control requirements are modest.

        http://www.watlow.com/products/heate...ne-heaters.cfm
        Is it plugged in?

        Comment

        • Regent
          Computer Tech
          • Dec 2011
          • 32
          • Canada

          #5
          Re: How to bypass an auto shut off?

          "the auto shut off itself will still happen because it is programmed into the software."

          Thank You very much Longbow for your excellent explanation!!!! I will be looking for another option like a silicone heating strips!

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: How to bypass an auto shut off?

            There should be a device called TRIAC on the board which is used as a switch to supply power to the heater, it is turn on by the micro controller, so if you want to have the heater on all the time, then you have to bypass the TRIAC,
            On the left side you can see HI (HOT IN), NI (NEUTRAL IN), and SI (SWITCH IN), the Neutral IN is fed to a fuse F1 which is connected to N where one wire of the heater is connected to, the other wire of the heater is connected to L which is the output side of the TRIAC.
            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

            • Regent
              Computer Tech
              • Dec 2011
              • 32
              • Canada

              #7
              Re: How to bypass an auto shut off?

              Thanks budm for your reply. I assume your talking about Triac Z0405MF? There are two of them. I attach two pics, one from the back of the ic board & the other one the front.
              Could please you explain which one needs to be bypass & how I should do it?
              Circuit boards are not my specialty! Sorry about that! But I do want to learn.
              Attached Files
              Last edited by Regent; 02-15-2014, 11:14 PM. Reason: The back of the ic board the triac are circle with a black marker.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: How to bypass an auto shut off?

                This controller looks like my Sunbeam thrown blanket, now I see the ON/OFF switch on the LED side of the board, that means the SI is not the switch but the sensor to detect how hot the blanket gets, if you bypass the circuit, the heater may just keep on heating and can over heat, I think that is one of the safety it has, so I do not feel safe for you to bypass the circuit, you can have big fire instead.
                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

                • Regent
                  Computer Tech
                  • Dec 2011
                  • 32
                  • Canada

                  #9
                  Re: How to bypass an auto shut off?

                  Thanks for your help & advice budm!

                  Comment

                  • Regent
                    Computer Tech
                    • Dec 2011
                    • 32
                    • Canada

                    #10
                    Re: How to bypass an auto shut off?

                    If I keep the ON/OFF switch ON by holding it there with an elastic it will default to the low setting after the one hour auto shut off kicks in!
                    There are three settings low, medium & high. Every time you press the ON/OFF switch it bring you to the higher setting but if you hold the button while on the high setting it will default to the low setting after an hour.
                    My question is how can I bypass the low & medium and go directly to the high setting from the IC board?
                    Last edited by c_hegge; 02-16-2014, 10:10 PM.

                    Comment

                    • sam_sam_sam
                      Badcaps Legend
                      • Jul 2011
                      • 6030
                      • USA

                      #11
                      Re: How to bypass an auto shut off?

                      Here is what I would do use all parts there are except the controller board and built my own controller using what mirco controller you can program

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: How to bypass an auto shut off?

                        Jump HI to L (do it at your own risk), then you will have full power to the heater, the only way to tun off is to unplug it, otherwise you'll need to re program the controller to do what you want to do.
                        You can also make a box with switch that will put a diode in series with the heater (50% power) or can be bypass with a switch to give full power. You need to know the current draw of the heater to get the correct size Diode.
                        If the heater is less than 300W, then you can use this:

                        http://www.westsidewholesale.com/lut...300nlh-wh.html
                        Last edited by budm; 02-16-2014, 05:41 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

                        • Regent
                          Computer Tech
                          • Dec 2011
                          • 32
                          • Canada

                          #13
                          Re: How to bypass an auto shut off?

                          Thanks for your help.

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: How to bypass an auto shut off?

                            That dimmer controller may work. Let us know what you end up with.
                            Last edited by budm; 02-16-2014, 05:44 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

                            • Regent
                              Computer Tech
                              • Dec 2011
                              • 32
                              • Canada

                              #15
                              Re: How to bypass an auto shut off?

                              I also believe that a bypass from HI to L and the Dimmer Switch might very well work! The specs on the blanket says 60 watts. Again thanks for your help.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: How to bypass an auto shut off?

                                Only 60W, must be smaller blanket than mine, at HI it uses about 160W on my blanket. That dimmer should work just fine and will allow you to adjust the power as well to suit your need.
                                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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