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I replaced a burnt out light bulb with another and it blew out very strongly. The door now does not close and any bulb I try will not go on. There is power to the unit and I hear a clicking sound when I try to close the door or turn on the light. Thanks

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  • pjjmartin Nov 13, 2009

    Hi,



    This is a problem I am having with my craftsman 1/2 hp garage door opener. I do not know what expert to select from the list.



    I replaced a burnt out light bulb with another and it blew out very strongly. The door now does not close and any bulb I try will not go on. There is power to the unit and I hear a clicking sound when I try to close the door or turn on the light. Thanks

  • pjjmartin Nov 13, 2009

    It has two household light bulbs, it has a remote and a wall control, and it has a learn button on the motor unit that flashes when i try to use it

  • pjjmartin Nov 13, 2009

    I have a craftsman 1/2 horsepower garage door opener. It was working fine until I replaced a burnt out light bulb with another one. Shortly afterward the bulb blew violently. Now the door does not open and the replaced bulbs do not light. There is power to the unit and it only clicks when i try to use it.
    In the pick an expert list who am I supposed to pick?

  • pjjmartin Nov 13, 2009

    I looked everywhere on the surface of the motor unit - could not see a reset button. Do I have to open up the casing?

  • pjjmartin Nov 14, 2009

    The sensors are orange and green so that is not the problem. When the light blew would that fry something? I took off the covers and I did not see any reset button or any sign of melting.

  • pjjmartin Nov 14, 2009

    I need to know what you mean by testing a relay of door latch. Where are these contacts? More detail needed.

  • pjjmartin Nov 14, 2009

    Hi Stephan,



    I could not find any plastic enclosed relay. I called Sears and technician said I needed to buy a $160 logic board! I have pulled out the logic board for inspection. Any final ideas or knowledge about logic boards?



    peter



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5 Answers

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  • Master
  • 1,015 Answers

The fact that the light bulb blew very strongly leads me to believe that there is an electrical short with the opener and it is very possible that the logic board was damaged from the short. You will need to start by inspecting the wiring that goes to the light bulb socket. See if the wiring has melted and is shorting to ground. Is the light bulb socket housing loose? You can use a fluke meter to test the light bulb socket for correct voltage. Also check both legs of the wiring to the light bulb socket. You will need to find the short before replacing the logic board or you could damage the new one you install. the clicking sound you hear is for the relay that turns the light on and off when the opener is not operating properly. Let me know if you have other questions.

Posted on Nov 14, 2009

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  • 194 Answers

Hello pjjmartin. I have some experiance with garage door openers but not as much craftsman openers. It sounds like you blew the relay. Was the bulb you replaced the original bulb with rated higher than the original bulb? The relay works as follows. When you push the open button on the remote , a low voltage circuit usually 12 V (called the control circuit) closes and this creates a magnetic pull in a magnetic inductor. This pull closes the main circuit and allows the lights and motor to operate. The reason this is used is because the motors sometimes have a very high starting current which could not be handled directly by the components in the circuit board. If you open the plastic cover off you opener , there should be a circuit diagram on the inside of the cover showing you the position of the relay. It should look similar to this on the diagram : What normally happens is that the little plate in the relay that connects the main circuit burns into place as it makes contact. This will probably also blow your fuse , so replace the fuse too. The relays don't all look alike , but you should not have trouble spotting it as it is a big component normally with a clear plastic side. Replacing this relay should solve your problem. (Also remove and reinstall to test the connection before replacing). Most of the time you can simply pull the relay from it's holder and replace it. They cost about $10 - $20 dollars and be sure to replace it with the same rated relay. You can buy this at most big electronics and hardware stores. Sometimes it will be soldered into the circuit board and in this case you will need to unsolder it first. SAFETY WARNING : Always remove the plug from the unit before doing any work on it. If you need more information , please do not hesitate to contact me. Kind Regards Stephan

Posted on Nov 14, 2009

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  • Stephan Reichert
    Stephan Reichert Nov 14, 2009

    Sorry for the squashed post , I do not know why it did that and will follow up with the technical support staff.

    I have some experiance with garage door openers but
    not as much craftsman openers. It sounds like you blew the relay.

    Was
    the bulb you replaced the original bulb with rated higher than the
    original bulb? The relay works as follows.

    When you push the open
    button on the remote , a low voltage circuit usually 12 V
    (called the control circuit) closes and this creates a magnetic pull in
    a magnetic inductor. This pull closes the main circuit and allows the
    lights and motor to operate.

    The reason this is used is because the
    motors sometimes have a very high starting current which could not be
    handled directly by the components in the circuit board.

    If you open
    the plastic cover off you opener , there should be a circuit diagram on
    the inside of the cover showing you the position of the relay. It
    should look similar to this on the diagram :

    What normally happens is
    that the little plate in the relay that connects the main circuit burns
    into place as it makes contact. This will probably also blow your fuse
    , so replace the fuse too.

    The relays don't all look alike , but you
    should not have trouble spotting it as it is a big component normally
    with a clear plastic side.

    Replacing this relay should solve your
    problem. (Also remove and reinstall to test the connection before
    replacing).

    Most of the time you can simply pull the relay from it's
    holder and replace it. They cost about $10 - $20 dollars and be sure to
    replace it with the same rated relay. You can buy this at most big
    electronics and hardware stores.

    Sometimes it will be soldered into the
    circuit board and in this case you will need to unsolder it first.


    SAFETY WARNING : Always remove the plug from the unit before doing any
    work on it.

    If you need more information , please do not hesitate to
    contact me.

    Kind Regards Stephan

  • Stephan Reichert
    Stephan Reichert Nov 14, 2009


    Diagram of Control Circuit and Main Circuit


  • Stephan Reichert
    Stephan Reichert Nov 14, 2009

    Electrical Symbol for a Relay as seen on the wiring diagram

  • Stephan Reichert
    Stephan Reichert Nov 14, 2009


    Picture of what common relay's look like


  • Stephan Reichert
    Stephan Reichert Nov 16, 2009

    The problem you have is that they probably work with a integrated relay on the board which is why they are asking you to replace the whole thing.

    It's basically a gimmick to help the company who makes these make a profit out of you each time you have a hickup with the unit. It is unfortunate but ultimately unavoidable.

    Good luck.


  • Stephan Reichert
    Stephan Reichert Nov 16, 2009

    Peter

    Just a final thought before blowing a small African town's income for a month. (really ridiculous cost!)

    Check all the capacitors (blown will probably be leaking) and check for burns or bad solder connections on the board.

    Smell through the board or get someone with a good sense of smell to do it....as you know...burnt components smell really bad and it should make it easier to spot a problem if you have a clue where to look.

    If you have a manual voltmeter , test the transformer (if there is one) with a battery. (will not work with a digital voltmeter)

    Double check your plug and measure to see if you are getting power just before the unit.

    That's about all I can think of right now. Will add if I think of anything else to do.

    Regards
    Stephan


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  • 788 Answers

Ok, on your garage door.
The noise you hear is normal when the door sensor's are not seeing each other.
At the bottom of the garage door, on both sides, you should see 2 sensors. These are motion activated. Another words, if something go across the sensor while the door is closing, it will stop the door as a safety. Or in some doors, if the door is open and you walk by the sensor, the garage light will turn on.
If one on these sensor's are out of alignment, the door will not close and the clicking noise is the light relay, which is supposed to be blinking.

Look at the senor on either side and you should see a orange light on one side and a green light on the other side.
If the sensor's have been kicked or moved out of alignment, you will have to line them up until you have the above configuration.

You should not have to reset or remove any covers. Do not push the orange or green learn button, as that is not your problem and will not help the currant situation.
Also, you should only choose the most helpful technician as only one can receive credit for you problem.
Thanks, let me know if you need more information.

Posted on Nov 13, 2009

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Either the door latch or a relay is bad. You can use an ohmmeter to test both.

Posted on Nov 13, 2009

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  • 6,927 Answers

Sounds like the door latch switch is busted,and is shorting,I am guessing this is a oven?it says air compressor at the top,really don`t know what you have.

Posted on Nov 13, 2009

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  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 13, 2009

    Might be the control board,I don`t know with out inspecting it,brands do not help,does it have a house hold bulb?and does it have remote?or on the wall control?If it is the on the wall control,take the control apart,and look for a short in the circuit board,and in the wiring.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 13, 2009

    Also look in the motor control and smell the motor to see if it has a burned smell,and look for shorts there.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 13, 2009

    O k,look where the motor is,and look at the motor control for a reset ,most likely a red button,to reset.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 13, 2009

    Yes,the casing,not the motor casing,but where the motor and gears are at.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 14, 2009

    The door lift at my work has a 110 house hold bulb in it,if the bulb burns out,it will not work,like a fuse,I suppose,I have seen this in guitar amps and such,look in the socket,with the system unpowered,and check to see why it blew,maybe try to replace the socket for the bulb,this may be a inline circuit and will not operate with out the bulb,let me know what you come up with.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 14, 2009

    Forget about the door latch thing,they have you under compressor,and I had another one under the wrong one,and got his messed up,and yours,but what I said about the light bulb,do that,and let me know,please,I am wondering on this one,and I think I am on to something.

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