I have an LG DLE0442W that is 5 years old. It has a habit of making a loud buzzing noise that sounds as if it is coming from the back of the control panel at the rear of the unit when the dryer is started. The buzzing is quite loud, and lasts anywhere form 5 to 15 seconds and then stops. Operation appears to be normal otherwise, except for the occasional times where it will act as if you pushed the power button and turns off.
The buzzing has actually been going on for several months now, the the turning off is something I have recently been told about and personally only observed once (today actually).
I have run the service self diagnostic modes listed in the LG service manual and everything seems to check out. It will heat to the appropriate temperatures in the 4 minutes as noted on test when you press the start button three times.
I've removed the front door assembly and verified everything is connected properly and cleaned out all visible lint/pet hair build up.
I've cleaned off the moisture sensor to verify it is clear of lint. I have also cleaned out the exhaust duct from both sides (it is a straight length of rigid metal that only has to run about 10" to reach the outside vent so it rarely has any build up in it.
I also confirmed that all chassis screws are tightly secured.
The only other problem we have ever had with this unit was that the two screws in the lower center portion of the lint trap holder (also where the moisture sensor is) protruded into the slot for the screen and the felt gasket would tear away allowing the blower to get seriously clogged. I "fixed" that by removing the two screws altogether and buying a new lint screen. That was done long before this buzzing started, so I doubt that this is related. If it is... what type of screws are they so I can get replacements (preferably a bit shorter so they don't ruin another screen)?