MT4155SPB2 Whirlpool Microwave - Instructions

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!

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

Removed M/W oven case/cover. Identified part needed. Found part online with in 2 minutes, ordered new door latch actuator, installed with part arrived within two minutes, reattached case/cover, reinstalled M/W.

Remove from cabinetry, take cover off and had a very difficult time removing the plastic form that has the switched in. Replace the lowest of all the switches, and then again very difficult time getting the plastic form back in. Some of the plastic even broke during the process but not any that could prevent it from working as it did before. I had ordered a fuse, 2 packs of 2 switches as there are 3 switches but only had to use 1 to get it working again. Tested after switch install, put the cover back on and reinstalled in the cabinet.

Replaced Door latch Bracket.
Filed a bit off the bracket connection fingers so to fit into the slot.

I'm so glad that the site was available on the internet!
I simply threw away the broken turntable and inserted the new.
I did not have to wait for a repair person!
Great! Thank you.

I called to make sure I was replacing the correct part. I paid over the phone and it came the next day. Very very easy process.

1.ordered the part 2.during wait time for part,i epoxied the broken ear of the door latch bracket back on to the broken part.3.waited 24 hours for epoxy to set,4.installed the repaired part.5.reassembled the microwave and reinstalled in the wall unit.6.days passed and the ordered door latch bracket finally arrived.7.we are using the microwave daily with the repaired door latch bracket,but we will keep the new part in reserve,just in case!JUST CAN NOT DO WITHOUT OUR MICROWAVE!

Well, first of all I luckily picked your website after it had broken that day, got all the info, ordered that day, and got it the NEXT day and my husband fixed it that day. VOILA!! That may never happen again, but that was the easiest thing we have ever done. You can better bet we will be ordering from this website again,as well as letting others know about it. Very impressed, and yes, this is real.

I ordered the part from partselect (PS972837 Door Latch Bracket) and read all the instructions written here, very easy to do! Saves me a lot of money!

Since others reported similar problems and it was just the fuse we tried that first. That wasn't the problem so we ordered the Door Interlock Switch Kit. Shipping was very fast! Our microwave had 3 switches. My husband asked how to know which one to switch. I read that one person just did process of elimination. Luckily ours worked on the first change out! So happy to have stumbled across this site and not have to buy a whole new microwave.

The only reason it took over 30 minutes was that the unit is a built in over the stove type installation. The special Philips like screw driver which I purchased was the wrong size. I had to use a small vice grip tool to remove and reinstall these screws. The suggestion to use a butter knife to spread the slot was a good one. The delivery from part select was amazing. We were not without our micro more than a few days

Took off the outside metal cover determined what the problem was immediately saw the broken latch ordered the new one received in 2 days snapped it into place the door opened then replaced the outside metal cover good as new.

This plastic door latch bracket controls the door opening. Ours broke after 7 years of use. Probably just the plastic fracturing after years of use. Hardest part is finding the special driver to unscrew the housing around the microwave so that you can get to the control panel. Ask for something that looks like an allen wrench with a hole in the middle. I took a picture of the screw in the microwave and brought it to a big box store and asked for the correct driver. I have a feeling that a "real" hardware store (like Ace or TrueValue) may have been able to just direct me to the correct screw driver but I'm cheap so I though a big box store would be less expensive for a tool that I may never use again. Once you get the correct screw driver, opening the microwave is pretty easy. MAKE SURE THE MICROWAVE IS UNPLUGGED BEFORE YOU GO ANY FURTHER. There are a number of these "special" screws (4 to 6) and some regular screws to remove. Once you pull the housing off the microwave look at the release latch inside (behind the release press plate). You should be able to jiggle it out especially since it is probably broken on one side. Be sure to find and remove all the broken pieces. Mine had just the main latch and a small piece that broke off. Pull it out and you are ready to put the new one in. It is a little difficult putting the new latch bracket in. Try inserting one side into the holder hole and very gently pressing the other side in. Be patient; with a little pressure it will snap in. Then you simply put the housing back on, put the screws in and every thing should work. $20 bucks for the part and a half hour of work (after you find that special screw driver) is much better than buying a new microwave. Good luck!