LG LMV1680ST microwave Parts

For the LG LMV1680ST microwave/hood combo, the most reliable reset is a power reset: unplug the microwave (or switch off the breaker) for about 2 to 3 minutes, then restore power and set the clock. This clears many minor control glitches.

Reset options for LMV1680ST

• Power reset (most common): unplug for 2 to 3 minutes, then plug back in.
• Breaker reset: turn the dedicated microwave circuit breaker off, wait 2 to 3 minutes, then turn it back on.
• Clear a stuck setting: press STOP/CLEAR once to stop cooking and clear entries.
• Child lock on/off (control panel locked): press and hold START/ENTER for more than 4 seconds until the lock indicator changes (details in the LMV1680ST owner’s manual).

If it still will not power on after a reset

If the display stays blank after a power reset, the issue is usually power supply related (outlet, breaker, or an internal fuse). Because internal microwave components can retain hazardous electrical energy, we recommend having a qualified technician diagnose internal no-power problems.

• Confirm the outlet has power (test with a lamp or small appliance).
• Check the home breaker and make sure the microwave is on a dedicated 15A or 20A circuit.
• If the unit is dead and the outlet is good, an internal fuse may be open.

Parts that may be involved (when symptoms match)

Symptom	Common area to check	Example compatible part for this model
Completely dead (no display)	Internal fuse circuit	Microwave fuse 3B74133Q
Runs but does not heat	High-voltage system	(Technician diagnosis recommended)

For step-by-step guidance on fuse replacement safety and process, see how to replace a microwave fuse.

Why it matters

Resetting restores normal control operation after a power interruption or minor electronic glitch, and it can help you quickly distinguish a simple control issue from a true no-power or heating failure.

Last updated: January 2026

Common problems we see with LG microwaves like model LMV1680ST include not heating, shutting off mid-cycle, turntable issues, sparking/arcing, and vent or light problems. Many are caused by door-interlock faults, airflow restrictions, or failed high-voltage components.

Most common symptoms and what they usually mean

• Runs but doesn’t heat: often a high-voltage failure (magnetron, capacitor, diode) or a door-interlock issue.
• Stops after a few seconds: overheating protection can trip if airflow is blocked or a thermostat is opening.
• Turntable not rotating: coupler or tray support problems, or the turntable feature turned off.
• Sparking/arcing inside: metal in the cavity, damaged waveguide cover area, or food splatter buildup.
• No power or dead display: blown fuse, power supply issue, or door switch problem.
• Cooktop light out: bulb or socket/lens issue.

Model-specific checks for LMV1680ST

The LMV1680ST has a Turntable On/Off control and an auto vent fan safety feature that can run the fan at low speed when the area gets too hot; in that situation, the fan may not turn off manually. See the operating notes in the LMV1680ST owner’s manual.

Quick checks you can do safely

• Confirm the door closes firmly and isn’t loose or misaligned.
• Try a different outlet or reset the breaker (if the unit is completely dead).
• Clean the grease filters and make sure vents are not blocked.
• Verify Turntable On/Off is set the way you expect.
• Stop using the microwave if you see repeated arcing or burning.

Parts that commonly fix these problems (when diagnosis points there)

Symptom	Common part to inspect/replace	Example for LMV1680ST
No heat	Magnetron	Microwave magnetron 2B71165R
Dead/no power	Fuse	Microwave fuse 3B74133Q
Shuts off/overheats	Thermostat	Microwave thermostat 6930W1A003E
Turntable won’t move	Turntable coupler	Microwave turntable motor coupler 4370W1A006B

Why it matters

Microwave/hood combos combine cooking and ventilation; a simple airflow restriction (grease filter, vent damper, blocked exhaust) can trigger overheating shutoffs, while “no heat” complaints often involve high-voltage parts that require careful, qualified service.

Last updated: January 2026

LG is a solid, widely trusted brand for microwaves, and the LG LMV1680ST microwave/hood combo is built with the core safety interlocks, venting features, and cooking controls you expect in a dependable over-the-range unit. Long-term satisfaction usually comes down to proper installation, cleaning, and using the right settings.

What we can confirm for LG LMV1680ST

From the model-specific documentation, LMV1680ST is designed as an over-the-range microwave/hood combo with standard household electrical requirements and built-in safety door interlocks. For operating details and care guidance, use the LMV1680ST owner's manual & cooking guide.

Key model-specific highlights:

• 1,000W cooking output (IEC 60705 standard)
• 1.6 cu. ft. cavity capacity
• 120V AC, 60Hz electrical rating; 14 amps / 1600 watts (microwave + cooktop lamp + ventilation fan)
• Vent fan and cooktop light controls (Hi/Low/Off)
• Auto features like Auto Defrost, Auto Cook, Auto Reheat, and Quick Defrost

What “good brand” typically means in real use

In our experience, most “good” microwave ownership comes down to three things: consistent heating, reliable controls, and easy maintenance.

Here are practical ways to judge it:

• Heating performance: food warms evenly when you use appropriate power levels and standing time
• Vent performance: the hood fan actually clears steam and smoke during cooking
• Ease of upkeep: filters and surfaces are easy to clean regularly
• Parts support: common wear items (filters, bulbs, fuses) are replaceable

Maintenance items that affect performance most

If your microwave seems loud, smelly, or not venting well, these are the first items we check and replace when needed:

• Microwave grease filter 5230W1A012E (helps capture cooking grease from the cooktop)
• Microwave charcoal filter 5230W1A011E (used for recirculating, non-ducted venting setups)
• Microwave light bulb 6912W1Z004B (cooktop light visibility)

Quick comparison: grease vs charcoal filter

Filter type	What it does	When it matters most
Grease filter	Traps grease from cooking vapors	Always, especially with frying or high-heat cooking
Charcoal filter	Reduces odors in recirculating vent mode	When you are not venting outdoors

Why it matters

A microwave brand can have a great reputation, but day-to-day results depend heavily on correct installation, safe operation, and routine cleaning. For LMV1680ST, keeping the venting system and filters maintained helps protect the fan, reduce odors, and keep airflow strong.

Last updated: January 2026