Humming sound, F9 and dead

You would better served replacing unit. Throwing parts at it is an unnecessary step.

If your microwave is making an unusual or loud humming noise, you may have a problem with the magnetron. This component is part of the high voltage circuit and provides the microwaves that generate the heat. If the magnetron is defective, it may cause a loud humming or buzzing noise

Humming when door is shut. Model #JA229216B 2013. Ge microwave.

Good possibility your start capacitor is leaking. When it goes completely it will blow fuse or circuit breaker causing a dead condition. You can get and replace this yourself but be careful to discharge the capacitor with a set of test leads across the terminals. This part can hold dangerous voltage! Of course, unplug the unit first. The magnetron is expensive if you can even get one. For the cost of most new units, this may be too much unless it’s a over the stove model.

That sounds like a problem on the invertor board. Unfortunately there is not a lot to be done on the board without a service manual and the needed experience.
Hope that helps.

you have done well out of the oven . it sounds that certain components are well worn and probably no able to get parts best advice it time to buy a new one

without the transformer it will not heat... replace the transformer... you can find it here....

http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=66561629100&productCategoryId=0123370&brandId=0582&modelName=MICROWAVE/HOOD-COMBO&diagramPageId=00003&componentDescription=INTERIOR AND VENTILATION&documentId=P0103150&blt=06

humming sound is your magneto going out Dont have any idea of the cost for replacement however it may be cheaper to purchase another microwave than to repair this one. Good Luck

Dave

Popcorn is heated by a metallic insert in the bag. This causes some additional power consumption by the magnetron. It is no cause for alarm.

Almost certainly, the component called the "magnetron" has died. This is the valve (tube in the US) which actually generates the microwaves. The loud humming is the transformer that supplies the magnetron being overloaded and/or the magnetron itself. If the rest of the appliance is OK and not too old, the magnetron can be replaced. If you aren't familiar with these appliances, you *must* get this done by someone who understands the dangers of messing with them - if you get it wrong, they can bite! In some countries, only qualified engineers can buy the spare parts. In the UK, the part costs around £40 - £80, depending on the model. If the appliance is more than around three years old, it may be a false economy to repair it as other parts may fail soon after the repair.