LG LMV1764ST Repair Guide
A compact-height over-the-range microwave that fits where taller 2.0 cu ft units will not. EasyClean interior, sensor cooking, and the usual LG over-the-range service pattern.
Common problems & typical repair costs
| Problem | Likely cause | Typical fix | OEM part # | Typical cost |
|---|---|---|---|---|
| Cooking weakly or not at all | Magnetron degradation or diode failure | Professional high-voltage diagnosis | — | $170–$405 |
| Unit dead | Interlock failure and blown fuse | Replace switch set and fuse | — | $115–$265 |
| Arcing during cooking | Waveguide cover burned or metal in the cavity | Replace waveguide cover; remove metal | — | $5–$60 |
| Vent fan noisy | Blower bearings dry | Replace blower motor | — | $150–$320 |
| Turntable stopped | Coupler stripped or motor failed | Replace coupler; motor needs cabinet access | — | $10–$200 |
Costs are national averages for professional repair (parts + labor). See the linked cost guides below for full breakdowns.
Error codes
| Code | What it means |
|---|---|
| F3 | Key stuck on the touch panel |
| F5 | Humidity sensor fault |
| F7 | Control communication error |
Tech notes
Never let an abrasive pad or oven cleaner near the EasyClean coating. Once it is scoured through to bare metal the cavity arcs on the exposed steel, and that ends the appliance.
Sources
Where the safety, regulatory and warranty claims on this page come from. Repair costs are our own figures based on Arizona market rates and OEM parts pricing.
- Microwave Ovens — Radiation-Emitting Products U.S. Food & Drug Administration The federal requirement for two independent door interlocks plus a monitoring system, and the 21 CFR 1030.10 leakage limit — why an interlock must never be bypassed.
Cost guides for this machine’s common repairs
DIY step-by-step instructions for this model
Find a microwave repair pro near you.
Browse verified independent appliance repair companies by city — ratings, hours, and phone numbers, no middleman.
We'll buy your LG LMV1764ST — or haul it away.
If the repair costs more than this machine is worth to you, we'll quote you on taking it. Cash offer if it still has value, free or paid scrap pickup if it doesn't. We'll tell you honestly which it is.