Confirm the incoming three-phase supply reaches the power switch input.
Fault route
LGK100L Power-On No Response Diagnostic
A first-layer input and power-switch route for LGK100L machines that show no response at power-on.
Quick Answer
For LGK100L power-on no response, start with input power and power switch evidence. The source workflow treats incorrect input voltage at the switch and failed switch output as the first split.
- Do not open the inverter power stage before confirming input voltage and switch output.
- If switch input voltage is wrong, the fault is upstream of the machine control system.
- If switch input is correct but output is wrong, inspect or replace the power switch and wiring.
Use this page when
- Machine shows no response after power-on.
- Input cable and power switch can be tested safely by a qualified technician.
- You need to separate external power and switch failure from internal board failure.
Do not use this page when
- The fan runs but display is off.
- The machine trips breaker immediately.
- Protection light turns on after the machine powers up.
LGK100L power-on no-response route
Input supply and switch output before board diagnosis.
If voltage on the switch input is wrong, trace cable and external supply.
If input is correct but output is wrong, suspect switch contacts or wiring.
Only after switch output is valid should downstream control power be diagnosed.
Power-on evidence table
| Evidence point | Expected / abnormal evidence | Repair direction |
|---|---|---|
| Power-switch input | Input voltage is missing or incorrect. | Check input cord, upstream supply and switch wiring. |
| Power-switch output | Switch input normal but output abnormal. | Repair wiring or replace switch. |
| Downstream boards | Only relevant after valid switch output exists. | Move to filter board/control transformer checks. |