All Installation Instructions for LG Range LMV1831SS

Numeric display was malfunctioning. Lit segments were dim and some non-lit segments were flashing faintly.

1. FIRST -> UNPLUG THE MICROWAVE!
2. Remove two screws (left & right most) at top to remove the vent grill.
3. Open the door and tilt top of vent grill out being careful of to not break the two mounting tabs.
4. Remove screw at top of the keyboard / display assembly (hinges at bottom).
5. Note the position of wires (take a photo) and remove 5 wire connectors.
6. Place keyboard / display assembly on a towel, face down.
7. Compare old PCB with new PCB and verify they are have the same part number.
8. Remove ribbon / flex cable (pull locking bar), and four screws to remove the PCB.
9. Install the new PCB, tightening the four screws and reinstalling the ribbon / flex cable. Flex cable must be straight and press the locking bar.
10. Re-install the 5 wire connectors using your photo.
11. Re-install the keyboard / display assembly and secure with the single screw.
12. With the door open, re-install the vent grill being careful to insert the two upper tabs.
13. Reinstall the two screws holding the vent grill.
14. Plug in the microwave and test.
In my case, the vent grill tabs were broken (one was broken prior to disassembly and the second damaged upon re-install).
Thus, I secured the vent grill using two plastic tie wraps inserted though the screw holes.
Total time: 30 minutes.

Parts Used:

PCB ASSEMBLY

David from Tucson, AZ
Difficulty Level:
Really Easy
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers

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The digital readout on the LG microwave started flickering and then finally just went blank.

I removed the overhead heat vent removed the screws off the digital panel board and pushed left on panel. Came off and then I removed the 8 screws holding the circuit board in place. Removed all the connected cables, then proceeded to install new circuit board. Reversed process. Microwave is brand new again.

Parts Used:

PCB ASSEMBLY

Jorge from PEMBROKE PNES, FL
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Pliers, Screw drivers

1 person found this instruction helpful.

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One of the clips that holds the microwave rack broke.

You just pull out the clip but the the hard part is doing that without bending the metal hole the holds the clip. If you do bend the hole the clip will not fit flush. Just get a flat screwdriver and reshape the whole.

Parts Used:

HOLDER,COOK AUXILIARY

Edward from Macclenny, FL
Difficulty Level:
Really Easy
Total Repair Time:
Less than 15 mins
Tools:
Pliers

1 person found this instruction helpful.

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Microwave fan would come on when door open. Timer and unit would not switch on.

I looked up my problem on the internet and found a very helpful video. Microwave on video was different brand but the internals and methods were very much the same. The video made it simple and easy to fix. Found the replacement switch on the LG parts site and ordered. Two different switch types. One with red switch, the other green. Part was $7.28. Saved a bundle in service costs. Here is the repair video.

https://www.youtube.com/watch?reload=9&v=_AglBJoHgDs

Parts Used:

Microwave Micro Switch

Dick from SANDY, UT
Difficulty Level:
Really Easy
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers

1 person found this instruction helpful.

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Door Latch spring keeper broke

Removed door from microwave and then popped the inside widow trim ring off. Removed 4 screws from the window bracket, replaced the latch with a new part and then assembled.

Parts Used:

Microwave Locker

Gregg J. from WEST CHESTER, PA
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers

3 of 8 people found this instruction helpful.

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Wanted to see the instructions before I install it.

Parts Used:

Microwave Damper

Rene from MORENO VALLEY, CA
Difficulty Level:
Really Easy
Total Repair Time:
30 - 60 mins

2 of 5 people found this instruction helpful.

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Microwave operated but did not heat

Initial failure of over range microwave Aug 3rd. Control Panel worked but no heat. Took to local LG authoriaed local repair place. They fixed it quickly and we re-installed it. Worked fine for 2 months then had similar failure again. Agaim took to same authorized repairer. They kept unit for 3 months but finally concluded theu could not fix it and suggested we contact LG for a partial refund. When they tested the unit during re-assembly in my presence, there was a blue flash and the fuse blew. Since we had built a custom tile mural back splash around this unit, I brought it home, ordered a number of time delay fuses new capacitor and two new high voltage diodes. However, using my Fluke DMM, I checked the existing capacitor and high voltage diode and they checked OK so I just replaced the time delay fuse. The high voltage transformer leads had 2 possible ways to connect to capacitor and diode. Tried one way, plugged unit in and turned it on, and immediatly blew the fuse. Replaced the fuse and reversed the high voltage transformer connections,amd turned unit pn, and it worked perfectly. Since we had experienced several power failures during the time of the original failure, the repairer concluded that power spikes might be at fault, so I also purchased a TrippLite ISOBAR4ULTRA 3300 Joule surge protector between wall outlet and microwave, and re-installed over range. It has worked perfectly since.

Parts Used:

Time Delay Fuse

Donald from Oak Ridge, TN
Difficulty Level:
Easy
Total Repair Time:
1- 2 hours
Tools:
Screw drivers

3 of 10 people found this instruction helpful.

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light bulb replacement

very simple

Parts Used:

Light Bulb - 120V 30W

Marianne from CHURCH HILL, MD
Difficulty Level:
Very Easy
Total Repair Time:
Less than 15 mins

9 of 29 people found this instruction helpful.

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No Heat

1. Removed unit from the cabinet. (2 screws). 2. Remove the outer microwave metal shell. (10 screws). 3. Locate and remove part. (3 screws). 4. Install new part and replace all screws. 5. Install unit back into cabinet. So easy. I will share this site with all of my friends.

Parts Used: