MT4155SPB5 Whirlpool Microwave - Instructions

Unplug microwave! It's NOT necessary to remove microwave from above stove. Removed two Philips head screws on top front of unit to remove front grille. Removed one screw to remove control panel, letting it hang down. Found inline fuse in cabinet where line cord wires come in. Pulled out blown fuse with thumb and forefinger. Snapped in new fuse, replaced control panel and grille with the three screws. Plugged in the microwave. -Worked great! Good opportunity while grille was off to clean it and replace the charcoal filter inside the cabinet.

Purchaced special security type srewdriver to gain access to interior of microwwave. Latch is press fitted in roller type receiver. No tool required to remove and replce new latch. Reassembled cover and job completed.

Removed the microwave unit from the kitchen built in space. 4 screws hold the perimeter cover on the four corners. Unit comes out easily after unpluging from wall.
Laid the unit on the counter and removed torx and phillips screws to remove the cover that wraps around the top and sides.
Latch bracket behind the door button had one pivot post broken. Removed the old bracket. Repositioned the new bracket by pressing it in at the plastic 'ears' on the microwave. The plastic 'ears' on the microwave unit give just slightly as the new bracket pivot posts wedge into place. Replaced the cover and put the microwave unit in the built in space.

I pulled out the unit. Opened the back by using the special torx driver (bought at Lowe's). Found out that Door latch bracket is broke. Checked the computer and was prompted to the partselect.com. I compared the broken part to their diagram. Ordered the part on a Saturday, it came in on Tuesday. Stick the part to where it belong. Presto. Microwave is working like new again.

Remove Oven from cabinet.Remove rear outer shell, 8 screws. Loosen two screws holding receiver end of broken component which is also a gang bar for several switches. Install new door latch by inserting extended end into gang bar and one of the two rotating pins into obvious receptacle and popping the second pin into slot provided. Refastened screws holding gang bar. Cannot go wrong, holes are manufactured into receptacle which properly aligns the component. Reinstall rear outer shell, Remount into cabinet recepticle. Very simple !

Opened Box and Replaced Part......No Problem!

After buying the (tamper proof star bit set) it only took about 15 min. You have to take the cover off to get at the latch. I found that removing the snap wire connectors made the installation easier. I made sure to mark each one, and not to force the new latch apart to much. It sure beat paying for a service call, saved about $100.

I removed the cover using a philips screw driver and a set op tamper proof torx head allen wrench set. I inspected the latch assembly and found the door latch part broken. It was easy to remove and the new part snapped into place. Repair was finished and microwave back in service in less than five minutes. Most folks would throw their microwave away and purchase a new one, the door mechanisms are usually easy to repair and parts are available. Be careful in there because of the potential of electrocution, that is why they put the tamper proof screws in place. Next time, try to repair your appliance before you decide to throw it away, may save you some hard earned money.

The push button door latch had broken on my microwave. After digging into the unit-which was the hardest part, getting the shell off and getting at the control panel, I was able to see an interior latch part that had one side of plastic broken off. 40. repair piece later and I was able to plug that in, put it all back together and it works, although it does not feel that solid or that it will last a lifetime. Glad I was able to fix instead of calling a repair guy.

Took microwave out of builtin cabinet with 4 screws.
Put microwave on center island and removed cover.
Tested interlock switch with volt meter and it appeared ok so I put my kit back in box and sent back.
Took out magnetron unit and replace with new part.
Put cover back on and test.
All is working and installed back in cabinet. Two weeks later all still working great.

Unplug microwave. Remove the cover(mine had six screws- including 4 special screws I was able to remove the special screws with pliers. Remove the broken latch. Then you must take out the two screws which hold plastic plate that has a bunch of wires connected to it. Otherwise you can’t install the new latch without breaking the side “axle” of the latch. Once you remove the plastic plate the new latch will snap right into place. Reinstall the plastic plate w the screws and you are good to go. Note of caution. The micro cover edges are as sharp as a knife. Use gloves!

ordered a new tray

I took the microwave out of the cabinet compartment and placed it on the counter. I removed the torx screws from the back and the two phillips head screws from each side. I then pulled the cover back and off. I removed the broken latch piece by pushing it away from me until the outside nipple was free and then pulled the piece out. I opened the door by pushing up on the latch with a flat head screwdriver. I put the end of the new part into the area behind the latch and on top of the microswitch and pushed until the outside nipple would slide into the slot. I then replaced the cover and secured with the screws taken out initially. Done.

The power on the microwave went completely out when I went to use it, but there was no power failure for the house or neighborhood. We removed the microwave from above the oven. Took out the screws on the sides and back of the microwave and slid the top back. The line fuse was located on top unobstructed, NOT behind the button panel like some microwave models. As the appliance is over 20 years old the line fuse was quite old. It was really hard to pry it out of its holder and actually broke. I used a vacuum to suck up the dust and glass and it was easier to get out the ends once the middle broke. Popped the new line fuse in, slid the top back on, put in the screws and put the microwave back in its compartment above the stove. Good as new!! We were about to spend money on a new microwave, but thankfully I came across this site. So happy I did!!

This repair was really easy. The part that took the most time was taking it down from it's compartment above the oven and putting it back up there once repaired.

Watched a you tube video prior to installing new switch. Followed the video which gave me confidence i was up to the task. After removing the touch pad I found my design was not exactly like the you tube model but I found the defective switch, replaced it and put the microwave back together. Works great. Again watch the videos