LG LDT7797ST Dishwasher Popped Then Lost Power

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   Stop the dishwasher immediately and leave it off. From a dry, safe location, isolate its power at the normal accessible disconnect or leave the dedicated breaker/fused circuit off. Do not press Start, reconnect it, or reset the circuit repeatedly.

   Expected result: The display and controls remain dark, or the breaker or protective device will not stay on.

   Next step: Keep power isolated and arrange qualified appliance service. If the household protective device trips again or will not stay set, also use a qualified electrician.

   Why this matters

   Why: The appliance has not recovered from the popping event; repeated energizing would add risk without identifying the failed part.

2. Check 2

   Without removing panels, pulling out the dishwasher, touching wiring, or reaching into the lower enclosure, look and smell only from a safe position for smoke, a burning or chemical odor, heat, scorch marks, melted plastic, or visible water at or below the unit.

   Expected result: Any smoke, persistent burning odor, unusual heat, visible scorching, melted material, or water is present.

   Next step: Stay clear of the appliance, keep the circuit off, and arrange qualified appliance service; use electrical or emergency help as appropriate for active smoke, fire, or a continuing electrical hazard.

   Why this matters

   Why: A visible hazard or water near an electrical appliance makes this unsuitable for a user restart or internal inspection.

3. Check 3

   At the household electrical panel only, observe whether the dishwasher circuit's breaker or protective device is visibly tripped. Do not open an outlet, remove a cover, or keep resetting a device after the popping event.

   Expected result: The device is tripped, immediately trips again, or appears on while the dishwasher remains completely dead.

   Next step: Leave the device off if it trips again or if there is any odor, heat, smoke, water, or visible damage, and arrange electrician/appliance service. Do not use a different outlet or extension cord as a workaround.

   Why this matters

   Why: A tripped or recurring protective device may indicate a circuit or appliance fault, but it cannot identify which internal component failed.

4. Check 4

   Record the event without attempting another cycle: the approximate time, whether the pops were sharp or repeated, whether a display or chime remained, the breaker status, any odor or water, and whether the tub contains standing water.

   Expected result: The dishwasher is fully dark, or a small light/chime remains but the controls do not start a cycle; water may or may not remain in the tub.

   Next step: Give the sequence and observations to the LG service representative or qualified technician. Do not reach into standing water or attempt to drain it through hidden electrical areas.

   Why this matters

   Why: These observations help service separate a total power loss from a control-interface symptom, but they do not prove a control board, fuse, pump, or wiring diagnosis.

5. Check 5

   Use the exact model information from the rating label or the assigned LDT7797ST support page when requesting help. Keep the model and serial details, the popping-then-no-power sequence, and the visible safety observations together for the service appointment.

   Expected result: The label or support page confirms LDT7797ST, while the reported event remains popping during a run followed by loss of power.

   Next step: Request model-specific LG or qualified appliance service and state that the unit made popping sounds before losing power. Do not substitute a generic part or service procedure.

   Why this matters

   Why: LG's model-specific manuals and repair path can be matched to the correct product; a similar-looking LG dishwasher or generic no-power guide may not have the same service information.