Hi, I'm an expert at fixing laser printers -- that's how I make a living, but I don't know microwave repair, so I'm looking for a little advice. I have a Whirlpool GH5184xp over the range microwave that is vented out the back wall. It's about 6 years old, and for the past several years has had a problem in the winter where the fan sound doesn't start up right away in the winter months (not the exhaust fan - that's fine). I'm guessing it's a fan because that's what it sounds like. I see a 12 volt fan in the parts diagram which I'm guessing is supposed to cool the inverter and the cold air is effecting its rotation? The problem is that the there is intermittent heat, a few zapping noises, and a burnt electronic smell. The same as this http://www.fixya.com/support/t2941104-model_whirlpool_gh5184xp_r_n
which suggests the Inverter (high voltage magnatron supply).
I'm considering closing off the external venting to prevent the cold air from coming in contact with the microwave. The inverter is $125, but considering time and hassle I may just replace the microwave with a new unit. Anyone have any recommendations for good brands of microwaves or recommendations on repair?