My panansonic microwave NN-T573SBBPQ works for 2-3 seconds then turns itself off! the lights all work, turntable goes around, fan works, time is on.

This is an inverter model so there is no diode or hv capacitor.
You must adt. the door latch switch assembly to make sure that the door hooks make contact with the switches. Common problem is that the assembly is bent and must be perpendicular to the door.If it is bent the switch will not make contact with the door hooks.
Place a dab of lithium grease on the tip of the door hooks to ease closing the door. This is the cause of the bent switch assembly!

You probably have a shorted main relay on your control board, which I can repair. Details here.

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No! the main fuse is okay because you would not have any power. I would check all door switches because they control light, fan, and turntable. If you are handy with a meter, set to ohms, disconnect one wire on side of switch, use meter to test, readings should show open/short when pressing the button and releasing it, replace wire to switch and repeat, if you hit one with the same readings pressed in or out, change the switch.

This sounds like a magnetron problem, if it gets to hot, there is a special thermal fuse that will open up if it senses abnormal temperature rise from the magnetron and after a cool down period it will reset itself. In rare cases I have known the thermal fuse to become defective and cut out prematurely. My feeling is replace the oven! because by the time you get a appliance repairman in for a sevice call and parts you probably could have bought a new microwave oven.

Your turntable motor need replacement. tip upside down with dish removed and gain access to turntable motor from underneath.(remove power plug before you start working on the m/wave.) 2 screws hold the small t/table motor in place.Unscrew both and pull motor upwards. Quote the info on the motor for a replacement. I find cooking isnt effected in any wayexcept if you want to bake things like cakes. It then requires the t/table motor.

check the damper motor is opening and closeing

Your description seems to be confusing turntable and light do not work
Bulb and motor OK
No power to light or turntable

Which is it?

They could be separate incidents. The drive motor could be fused and the globe just blew its life away..

The turntable is a seperate intenty from the microwave itself, I would presume that the switch that turns off the turntable when the door is opened needs replacement.

buy new one magnatron is bad

2 fuses in a panasonic does not sound enough.
have you checked the main incoming power protection fuse normally 10amp or higher.
most panasonics have approx 4 fuses so keep on looking