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85770 (WHESEC) LG Range - Overview

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Glass Cooking Tray – Part Number: 1B71961H
$45.29
On Order
Glass Cooking Tray
★★★★★
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(15)
Part #1B71961H
This OEM glass cooking tray is a removable glass plate, measuring 13 inches in diameter, that spins inside the microwave during operation. It ensures that heat is evenly distributed in the microwave to properly heat or cook the food. Over time, the heat generated in the microwave can cause the glass to warp and the plastic rollers to wear down. The glass can also crack or shatter accidentally. It is important to replace the glass as soon as it is no longer functioning well to prevent uneven heating and reduce any safety hazards from damaged glass. Carefully pull the old glass cooking tray from the microwave and clean the microwave cavity. Place the new tray onto the rotating mechanism, and properly align it with the rollers. Turn the microwave on and check to see that the tray is rotating freely.
Air Duct Bracket – Part Number: 4810W1A151A
$17.15
In Stock
Air Duct Bracket
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★★★★★
(2)
Part #4810W1A151A
This bracket holds the metal or plastic flapper that closes off the exhaust duct when the fan is not running and opens when the fan turns on. If the exhaust fan on your microwave does not appear to be working, the problem may be with the damper assembly. If the damper does not open and close easily, check for any damage to the bracket, and replace if it is damaged or faulty. This genuine OEM exhaust damper measures approximately 12 inches long by 5 inches wide.
Time Delay Fuse – Part Number: 3B74133Q
$11.77
On Order
Time Delay Fuse
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(3)
Part #3B74133Q
The fuse-time delay may also be known as a line fuse or a microwave fuse, and it is a piece for your microwave. The function of this part is to shut off the microwave if there is a power surge, in order to protect your microwave from damage. You should consider having a service technician install this part as the high-voltage capacitors in a microwave can contain a very harmful electrical charge, even when the microwave is unplugged and has been inactive for some time. The tools that would be needed to complete this installation include a Phillips screwdriver, an insulated screwdriver, and a pair of pliers.
Rivet – Part Number: 4051W3A001A
$6.40
In Stock
Microwave Screwtapping – Part Number: 1TTL0402818
$13.92
Special Order
High Voltage Diode – Part Number: 6021W3B001V
$17.15
In Stock
Switch,Micro – Part Number: 3B73361E
$21.45
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Switch,Micro
Part #3B73361E
This is a micro switch, but you may also know it as a door switch and it is compatible with your microwave. The function of the micro switch is to communicate to the electronic control board of your appliance when the door is opened and closed. If this part is broken and needs replacing you will notice your timer activated but the food inside is not being heated. This part measures to be roughly 1.5 inches long by just over half an inch wide, and it is black in color. You will find the location of this part behind the front panel of your microwave.
Hardware Mounting Kit – Part Number: 3861W1A043C
$43.18
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Filter,Grease – Part Number: 2B72705B
$21.45
Special Order
Filter,Grease
Part #2B72705B
Thermostat – Part Number: 6930W1A003J
$21.45
In Stock
Thermostat
Part #6930W1A003J
This is a high-limit thermostat for various models of LG microwave ovens. This thermostat acts as a preventative safety device and is designed to cut off continuity for the microwave oven if/when its temperature exceeds a certain threshold. If you are noticing dangerously high temperatures coming from your microwave oven, make sure to turn it off and test this thermostat with a multimeter for continuity, to ensure it is still working properly. If not, it needs to be replaced immediately. This thermostat is sold individually and does not come with any other parts or securing screws.
Screw,Tapping – Part Number: 1TTL0402422
$13.92
Special Order
Screw,Tapping
Part #1TTL0402422
Window,Glass – Part Number: 4890W1A045A
$13.92
In Stock
Window,Glass
Part #4890W1A045A

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Engine – Part Number: 85770
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Part #85770

Common Symptoms of the 85770

How this model fails, and the parts that fix it.

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Broke the round glass tray
10 of 14 people found this instruction helpful.
  • Eileen from DETROIT LAKES, MN
  • Very Easy
  • Less than 15 mins
new glass tray
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The Microwave was completely dead and wouldn't run, light up or anything.
3 of 6 people found this instruction helpful.
  • Christopher from SHERWOOD, OR
  • Easy
  • 1- 2 hours
  • Pliers, Screw drivers
I followed an old appliance repair forums post from 2008 that discussed this exact common issue with this LG model. It took me quite a while to find the info. Then I used the schematic diagrams on your website to find where the part was located inside the microwave. I removed the outer cover. I tested all components including the thermost at for continuity with a multimeter. I discovered there wasn't any continuity in the thermostat so ordered the part and replaced it. Everything works like a charm! Thanks for the great, fast service.
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Microwave operated but did not heat
3 of 10 people found this instruction helpful.
  • Donald from Oak Ridge, TN
  • Easy
  • 1- 2 hours
  • Screw drivers
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.
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