MS-1642KSZ LG Microwave - Instructions

Unplug the unit before servicing. Need phillips screwdriver. Open door. Use step ladder to access and remove 2 small screws from top of the room air diffuser at top of unit. Slide diffuser slightly to the left to align the diffuser's plastic tab on the left side to rotate toward you. (The wires for the front control panel are at the far l ... Read more eft side of this difuser, but difuser is slotted for easy removal). Once the difuser is removed you will see 1 screw at the top that secures the pannel cover on the left side of the unit. Remove screw and slide this panel slightly up and out. This exposes the plastic frame that holds the upper and lower door switches. To locate the door switches and observe how they work, close and open the door and watch the door (bayonets) open and close the micro switches. Do the (red) buttons on top of the switches move up and down when the door bayonets push and release? If the buttons do not "pop" up when opened the switch is defective. The switch frame is secured with 2 screws. Remove screws and rotate the unit out for easy access to the micro switch(s). The internal (spring?) on my unit that is suposed to allow the red (visible) button on top of the switch to "pop" up when the door is opened was broken. Carefully pry the switch outward while being careful to lift the plastic holder-piece that holds the switch in place. Be careful, there is a small pin on the frame, so rotate the switch OUT toward you while lifting (carefully) the plastic holder-piece (you will see it on top of the switch). You can use an ohm meter to test the continuity of the switches. But if the buttons don't "pop" they are defective. Replace switch and reassemble.

Watched a couple of repair videos on Youtube by searching for the model number. Found out what to do in order not to get shocked by the powerful capacitor.
Ordered the two switches (To be sure, I could have ordered a third switch as suggested in the videos.)
Bought a tamper-proof star bit to get the cover off. Followed the dir ... Read more ections to replace the switches. - I broke the harness and had to use some super glue, but it's all good. I should have removed the harness instead of trying to get a switch out while it was still in place.
It's all back together, and the wife is happy!!

tested all 3 of the door switche for continuity, the top switch was faulty, replaced it,for approx $4.00 and saved a $350 dollar microwave.

Removed outer cover

removed lower door switch

installed new switch

Wa La!

I went to LG website enter model number and was given a list of parts that need to be replaced with a percentage of which part fails the most. I order micro switch PS3522738 which arrived and PS3529293 was backordered. I installed the one that arrived. The microwave worked briefly. I reordered and waited for both switches to arrive and in ... Read more stalled both. The microwave still doesn't work.

Open the front door of the microwave oven unit. Lift out the round glass food tray. Remove the Turntable Assembly and set it asside. Position the REPLACEMENT Turntable Assembly orienting the centering socket to the drive home in the floor of the oven cavity. Gently tap the assembly assuring it mates with the drive mechanism below. Replace ... Read more the food tray centering it on the Turntable Assembly. Gently move the food tray from side to side assuring that it moves correctly. Close the oven door. Follow instructions that came with the unit for set-up instructions. Done..

Removed some cosmetic panels. Removed the assembly with micro switches. Examined the faulty switch by checking the clicking action of switch. Two others were ok by this method. Replaced the switch with new one. Works fine so far. Thanks to web site and YouTube videos.

Take cover off microwave. Check door switches to determine which one was faulty.Remove and replace faulty switch.

Remove screws, take microwave cover off. Pull light assembly and unplug bulb. Replace with new bulb and snap back in place. Screw cover on and your done.

i unplugged the unit,unscrewed the outer shell so that all the wiring and internal components were visible.starting at the first of three micro switches i removed the slip on terminals installed the alligator clips too the wires so the switch would now be bypassed.i made sure the wires and clips were not touching anything plugged unit in ... Read more and it worked.i then installed the new switch and closed up the outer shell

Problem was due to a faulty door switch. Replaced with a new switch and the microwave now works fine! Only thing that was tricky was that LG uses the hex screws with a peg in the middle to keep the microwave cover on. Had to use a small screwdriver and pliers (on the screwdriver) to unscrew the screws.

brought new one and the help with the sites pictures to describe what I need was extremely helpful. The prompt delivery was great.

Lifted up the glass plate, lifted out the plastic base that rotates and placed the new one inside. The piece that connects is shaped like a semi-circle, so I rotated it until is dropped into place. Then I put back the glass plate and it was finished.

saved me having to buy a new microwave. It was super fast delivery, had the part the next day! Amazing service and great customer support.