MT4155SPT0 Whirlpool Microwave - Instructions

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.

Take off the cover top and both sides then i saw door latch bracket was broken one side after that I was used screw drivers take off old one out then replace new door latch bracket it very easy

Although the housing cover of the microwave had the "tamper-proof screws" described by earlier commenters, I easily removed them with pliers rather than a special screwdriver. Like others, I found that one of the two hinge posts on the plastic Door Latch Bracket had broken off. The broken bracket could be removed easily, but I had trouble fitting the blade of the replacement part into position until I loosened one more screw on the receiving latch board to allow extra maneuvering room. Only then did both hinge posts fit into their proper mounts and snap in easily.

Initially we started looking to buy a replacement microwave to replace our 13+ year old built-in microwave. It was a real pain finding a replacement to fit the exact dimensions. So I thought I'd try to find an old KitchenAid microwave. However, I was pleasantly surprised when this site came up on my search. Their website allows me to input the problems and then it showed two possible parts that needed to be replaced. I emailed tech support and asked them which part I needed. They responded very quickly and said I needed to replace the magnetron. I watched a couple YouTube videos and then pulled my microwave apart. It was incredibly easy to pull the outer cover off. The magnetron had 5 screws that needed to be removed and one electrical plug. Took me maybe 10 min to complete the entire repair. It was one of the easiest repairs I've done and so thankful for this site They saved me a ton of money from not buying a new microwave and we now have our microwave working again. In hindsight, I wouldn't hesitate. I'd order the Part now and get it fixed.

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.

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.

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 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.

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.

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 !

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!

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.

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.

Remove outside cover of microwave.Note that there are 3 unique security screws that you will need a special screwdriver to remove. There is a YouTube video that shows how to install new part. Although this was a lot cheaper than buying a new microwave the cost of $57.00 plus shipping for this 3 inch plastic part was ridiculously expensive.

The instructions on the website were incredibly easy and I saved myself a lot of headache by using this site.

-it was built in unit - so I needed to pull the decorative grill from around the outside to remove it from the wall
- removing the back of the case involved removing phillips head screws from along the side and back of the unit. the only issue I encountered on removing screws was the fact that the "torx / star" screws could not be fit with the wrench that I had (they had a pin in the center that would not allow the wrench to fit into the star). However, a pair of pliers was handy and they were removed just easily.
- I had ordered both the high voltage diode and magnetron because I didn't know which item was the problem. I grounded the diode with two screwdrivers while wearing rubber gloves to be safe. the warnings on this did the trick as it was the only scary part of the operation.
- the diode was a little hard to spot looking at the schematics, but is is found on the lower right corner of the right side of the panel and easily pulled out and replaced. I tried the microwave again to see if it worked...and it did not. So I confirmed that the magnetron was the issue.
- removing the screws for the magnetron and putting in the replacement was a dead easy and I tried the microwave again before putting cover back on. Worked like a charm. Super easy!