Replaced the bulbs underneath now they won`t turn off

You know how when you turn on a regular light bulb and it burns out with a bright flash? What happens is that when the filament burns out, it breaks and bounces back and hits the other electrical post and basically shorts out causing that bright flash. Sometimes, when 1 of the light bulbs in the microwave burned out, it shorted out, and caused the circuit-board trace to burn up. (This is not just conjecture; I've seen it.) If that's the case, then you would have to replace the main control circuit board. A rather expensive repair for no lights. BUT BEFORE YOU DO THAT, get an ohmmeter and check your new light light bulbs and make sure they are really good. Also, if you can, get a bright flashlight and check the light bulb sockets in the microwave (unplug it first). Check for possible corrosion or signs of arcing on the center electrode of the socket. If that's the problem, you might be able to use a small screwdriver to scrape off the corrosion of the socket (make absolutely sure you have your microwave oven unplugged before you do that!).

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

Blew a trace off of the back of the board by it shorting out when the bulb was unscrewed, Either have to find someone to repair the main circuit board or order a new one. But $$$$ always unplug the Microwave to replace the builbs, It doesnt seem like a big deal but I have seen this a lot over the years and it really does some damage to the main PC board.

I am not familiar with this particular model, however it appears to be a screw in bulb. Find the manual here:
http://shared.whirlpoolcorp.com/assets/pdfs/literature/C8940848.PDF
And the part is here:
http://www.repairclinic.com/Amana-Microwave-Lighting-Light-Bulb-Parts
I hope this is helpful.

HELLO.

This is the solution to the problem as detailed below.

instruments needed
* Appliance bulb
* Screwdriver.

Unplug the microwave. Remove the lamp cover by unscrewing the mounting screws. Turn the bulb to tightly screw it in. Then plug the microwave back in to test the light. If the bulb still will not illuminate, it is likely broken or defective. Replace it with another 20 to 40 watt appliance bulb.

That's on page 33 of the owner's manual. If you've misplaced yours, it's archived online here.

Cooktop Light/
Night Light

Replace the burned-out
bulb with a 40-watt
incandescent bulb
(WB36X10003), available
from your GE supplier.

1 To replace the bulb(s),
first disconnect the power
at the main fuse or circuit
breaker panel or pull the
plug.
2 Remove the screw from
light cover and lower
the cover.
3 Be sure the bulb(s) to be
replaced are cool before
removing. After breaking
the adhesive seal, remove
the bulb by gently turning.
4 Replace the screw.
Connect electrical power
to the oven.

Oven Light

Replace the burned-out
bulb with a 40-watt
incandescent bulb
(WB36X10003), available
from your GE supplier.

1 To replace the oven light,
first disconnect the power
at the main fuse or circuit
breaker panel or pull the
plug.
2 Remove the top grille by
taking out the 2 screws
that hold it in place.
3 Next, remove the screw
located above the door
near the center of the
oven that secures the
light housing.
4 Replace the screw.
Connect electrical power
to the oven.

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

We replaced the board behind the control panel. $130.00. If you do this make sure you can put the wires back the right way. My husband finally got it and our micro is working like brand newThanks to all who tried to help.

We see this a lot. The problem is on the control panel, which we regularly repair nationwide for $39.95 postpaid.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

Details of our service and critical safety information and disassembly information is at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.

first remove mains cord from main power. and remove the microwave oven top cover and check the bulb and crefully remove the old bulb and put new bulb. at high voltagae section dont touch any thing ,that area very dangerous ,thats why very carefully work inside the microwave oven ..

The turn table and fan are connected in series with the bulb,as you have mentioned that you have replaced bulb,so please check again for any loose contact on bulb holder or bulb continuity again.

The controller needs to be repaired. We regularly repair these control board assemblies for only $32.50 nationwide, and that's much cheaper than replacing the board. For safety, disassembly and other info see http://tinyurl.com/yzjozk