The microwave seems like its working but when starting the power goes off and on. the digital display blinks, its heates and turns the carousel fine. When not in use and open the door. the light comes on then go off. Is it just the door switch going bad? where is the part if so

faulty microwave module replace it

Sounds like the inverter (power supply for cooking) or the magnatron which does the work----neither are cheap parts.

see this causes and fix it. God bless you
ough the carousel is usually driven by a small motor that's unrelated to the heating function of the microwave, the microwave cabinet needs to be opened to repair it. So we recommend that you seek the assistance of a qualified appliance repair technician. Inspect the plastic drive coupling that the tray sits on, as well as the ring-and-roller assembly, to make sure that they're working properly

It sounds like one of the door switches has become defective, each must be disconnected on the one side and tested with a digital meter using the ohms scale.

possible busted fuses chek it or replace it

9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section. Q - My microwave is running and sounds like it is working but will not heat up anything.
A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....

Q - The microwave display counts down and the inside light is on, but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
thanks.

I have a GE Profile Spacemaker model JVM3670WF001, purchased I think in 2003. Pop sound, no Heat. Light goes on, carousel goes around,
Repair or new microwave

You probably have a defective magnetron or blown fuse supply power to magnetron.

WHAT IS WRONG WITH YOUR MICROWAVE?

For a detailed Microwave illustration, click below.

Counter top
Built in
Danger! You can receive a serious electrical shock from the components inside your microwave oven--even when it's unplugged. Only a qualified appliance repair technician should perform any repair.

It doesn't work at all
It sounds normal, but there's no heat
I can't adjust the power level
The carousel won't turn
I have intermittent cooking problems
The display flickers
There's no heat, but it buzzes loudly
It quit after I slammed the door
It looks like there's lightning (arcing) inside my microwave

hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE;

at highvoltage section wiring may bae problem, check wiring and connectrors of magnetron and capacitor and transformer.