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Microwave door did not close
Initially I called a Samsung recommended appliance repair outfit to fix the latch. The technician informed me that he does not fix latches. I need to buy a full new door for the microwave for $215 plus he charges $165 to come to my house. I got angry and did some research and it turned out that this is a very common problem. I ordered part PS4229162 "door key" $6.67 then followed the instructions on a youtube video by zimsjeep "Repair a Broken Microwave Door Latch" to install. At first I struggled a bit hooking up the spring to the frame, but then I used a slim plier to hold the spring (instead of my fingers) and that did the trick.
Removed control panel, discharged HV capacitor. Removed old diode, tested to confirm failure. Replaced part. Other than the removal of the panel swapping the part was almost as easy as replacing a light bulb.
The high voltage tired was shorted. I replaced it with a new one, but that did not solve the problem.
You can test the high voltage tired with a voltmeter and a 9 V battery. Search Search for it on YouTube.
You can also test the high voltage capacitor, the high-voltage transformer, and the magnetron with a multi meter. Search for the procedures on YouTube.
I tested all these high-voltage components with a low-voltage multi meter, and they all checked out OK (after replacing the diode). However the microwave still did not heat food.
When working on a microwave it is important to unplug it and also discharge the high voltage capacitor. The capacitor has a 10 megaohm resister to automatically discharge itself, but it may have failed – – so discharge it manually.
Microwave would continue to run even when door was open. (even if no time was left on timer)
Unplugged Microwave, Removed vent cover (2 screws on top of microwave, then slide cover to the left, then forward) Removed control panel (1 screw at top of panel) then removed the two screws that hold in the door switch assembly. (these you will only see by opening the microwave). Located lower door switch, removed connecting wires, and pulled switch by releasing small plastic tab which held it in. Put new switch in place, reconnected wires, then reconnected door switch assembly. Reconnected control panel, and then put the vent cover back on. Tested microwave and it no longer runs when the door is open. Super easy fix, and was done in under 5 minutes.
The part should have just been pulled up and out, mine was broke off so I had to drop the bottom tray and push the remaining old coupler up and out. I dropped the new part in and reinstalled the bottom tray. It was also a good time to clean the tray
I picked up a used microwave that came with the needed mounting plate but no screws
Based on my research, this over the range miscrowave should have come with 2 templates: 1 for the wall and 1 for the underside of the wall cabinet. The challenge was to measure every very aspect of that microwave in order to obtain placement specs for the mounting screws. Tip: I made the holes through the top cabinet bottom a little larger than needed and used big washers with then for stability to gain the most "play" in the self aligning screws. Worked out well. Took 2 tries to get the wall plate perfect so have precision in mounting that piece.
I removed the outer cover and exposed the inner workings. I watched a video on partselect.com to show how to remove and replace the Diode. I followed the instructions and it was very easy to replace.
Unfortunately, the diode was only part of the issue. I ended up replacing the High Voltage capacitor and Magnetron also. Those were a little more complicated but still easy to do.
Now the Microwave works just like new! Cost me less than $100 for all parts.
The plastic door key (latch) broke where the spring attaches.
I took off the inner plastic frame of the door, removed the broken part, hooked the spring up to the new latch and replaced it into the proper alignment holes, and works perfectly. It was less than a 5 minute repair.