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Anyone perhaps know why my LG microwave LMV1683ST will not function with a new door assembly?

Sorry for the re-post, but the question I asked earlier was mistakenly marked as Solved. My old door frame was cracked in a couple places but still worked taped together. I bought a new door assembly #ADC73908103, but after installing the new door the microwave will not heat and the carousel does not turn. The light goes off when I close the door, the fan does come on when I press start, and the timer counts down, but as I said the carousel does not turn and nothing is heated. I can put the old cracked door on and it works fine again, but not with the new door. Everything looks identical and I see no reason why it is not working. Am I missing something here? It has to be something simple, but I can't figure it out.

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  • LG Master
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I hate to be the bearer or conduit of bad news, but IF the old (broken) door works, but the new door does not, the new door may not be the exact replacement part! Otherwise, the operation would be identical. Clearly, the problem is not with the microwave circuits because they work fine with the original door! Is there a flexible circuit strip that plugs to or from the door, to the control board in the main unit? If so, does it look any different than the original counterpart to it?

Posted on Apr 18, 2017

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  • William Davidson
    William Davidson Apr 19, 2017

    There is no wiring in the door. It should be the exact replacement genuine LG part assembly. It looks identical. Granted, I haven't completely disassembled the doors for comparison, but I have swapped out the plastic latching part that actually latches the door shut. Everything looks identical. Honestly, for someone to help me with this they would probably have to be familiar with LG and this model. It makes no sense. I've read about microwaves being in a "demo" mode, but I don't see how swapping a door assembly would cause that.

  • solver2010 Apr 19, 2017

    Then I think you might be the victim of "cost reductions" by the parts maker. When you look through the glass, are you looking though a screen mesh? Are the hole spacings identical on both doors? The wrong material for the screen, or the wrong hole spacings in that screen will present a different electrical load to the magnetron tube in the microwave!

  • William Davidson
    William Davidson Apr 20, 2017

    The screen mesh in the door looks to be identical in every way. I did however notice a slight difference in the metal frame inside the door. There is a couple of small holes on one side of the new frame that is not on the old frame so they are not exactly identical as I thought, but the difference is minuscule visually. However, if the materials in the metal are not the same maybe that is the problem. I don't know what else it could be. I wasn't aware that the screen in the microwave window was a functional part that impacted the electrical load in the oven. Thank you for that information. Based on that, I think it is probably the materials not being quite right that is causing the problem.

  • solver2010 Apr 20, 2017

    At one time, I was working as a designer on FM radio commercial broadcasting equipment. I had to be extremely careful not end up with "standing waves," which could cause significant reductions in broadcast power and sound clarity. Citizen's Band (CB) radios used to be very sensitive to such "fine tuning" in their heyday! Microwave ovens actually "broadcast" their power into whatever you are cooking ... wirelessly! It all makes perfect sense!

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