Confirms partial power and points away from total no-response.
Fault route
MIG200DL Fan Runs But Display Is Off Diagnostic
A display-supply route for MIG200DL welders where the fan runs but the digital display is blank.
Quick Answer
For MIG200DL fan runs but the digital display is off, split the DC540V bus path from the DC5V meter supply. The source workflow checks that the bottom board sends DC540V to power-board P12, then checks power-board P6 DC5V output to the display.
- Fan running means the machine is not a total no-power case.
- P12 DC540V confirms the bottom-board-to-power-board bus path.
- P6 DC5V determines whether the display head is being supplied.
Use this page when
- Fan runs but the voltage/current display stays blank.
- P12 and P6 connector evidence can be checked.
- You need to separate bottom board, power board and display head.
Do not use this page when
- Fan is not running either.
- Input breaker trips.
- Display works but output is missing.
MIG200DL fan-runs / display-off route
Bus evidence first, meter supply second, display head last.
Bottom board should output DC540V to the power board.
Power-board P6 should provide DC5V for the digital meter.
If DC5V exists but display is blank, inspect or replace the meter/display.
Display-off evidence table
| Evidence point | Expected / abnormal evidence | Repair direction |
|---|---|---|
| Fan operation | Fan runs while display is blank. | Use partial-power route, not total no-power route. |
| P12 | Bottom board should supply DC540V to power board P12. | If missing, inspect bottom board/DC bus path. |
| P6 | Power board P6 should output DC5V for digital meter. | If missing, inspect power board. |
| Digital meter | DC5V present but display off. | Replace meter or repair meter wiring. |