Door shut off malfunction

Check the door switch and once the door is shut the board must be active. If there is no clock or display then the processor board is faulty. Also if there is no action from the touch pad then it must be checked. Since the turntable works as you start the processor seems to work but the output to the magnetron is not active. So you need to check the relay to the magnetron switching, check the temperature cut off unit and the main capacitor.
All the above seems to be suspected.
Attempt with care/caution as there is high voltage present.

have the damper motor checked

Magnatron failure is rare. I suggest you check your door interlock safety switch. Do you regularly open the door while the machine is running? I did and I found out that the micro switches (door safety swwitch) are just not up to that kind of abuse. Your maching thinks the door is open because the contacts are burned to the point they do not close.

Unplug the machine, DO NOT TOUCH THE SILVER CAN! You will find the switches opposite the hinge. Check them with a volt ohm meter on contunity setting.

You cam probably get replacement switches at a electronics parts place.

There are other things that can be wrong but you should check these switches first. Cost should be less than $10.00 if you do it.

Let me know if this works for you.

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Check the door latch mechanism the black nylon door catch may be broken.

Sorry this is something you wont fix at home I couldent even do this one.This is a nice unit depending on the cost this one I think is worth the repair bill , Good luck DFD please rate me TK U

You may need to replace the magnetron or the high voltage diode.

This is usually caused by either a bad door switch, a loose door switch mount (which are pretty simple problems to fix) or occasionally a problem on the control panel.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

You can find an authorized Panasonic servicer here. You can order Panasonic parts here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Sounds like the door switches are out of adjustment or broken.
I would take it to a shop for repair. Microwaves are almost always repaired affordably unless it is really old.
Hope ya fix it!

Found this Panasonic post in the Samsung section!

If it moves just a tiny bit when the door opens and then stops, that's normal.

If it keeps running when the door is open, that's usually due to a bad door switch or broken / loose door switch mount.

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Any Panasonic parts not available locally can be had here: http://www.pasc.panasonic.com/epartr

We appreciate your thoughtful rating of our answer.

PLESE CHECK RELAYS ON PCBOARD .ALSO TRY DISCONNECTING ALL CONNECTIONS TO FRONT PANEL LEAVE IT DISCONNECTED 5MIN THEN RECONNECT AND TRY THE ELECTRONICS SHOULD RESET .HOPE I HELPED BIT OF A WEIRD FAULT