The Dishwasher Died Immediately After Cosmetic Door Work
The interface and main control were both replaced without restoring power. Supply checks and another circuit did not change the result. The most useful clue was the event boundary: the failure began when the door assembly was disturbed.
Why the last successful action matters
When a machine works before a door-panel replacement and is dead immediately afterward, the altered area deserves a complete inspection before unrelated parts are blamed. Harness routing, pin seating, a damaged wire and an intermediate module can interrupt the UI path.
A similar symptom can have a different cause on another dishwasher. Lost neutral, a loose junction-box connection, failed control or defective interface can also produce no response.
What two unsuccessful board replacements ruled against
User interface
A second interface produced the same dead condition.
Main control
A replacement control also did not restore the panel.
The path between them
Voltage was reported at the UI route, but the intermediate connection and module had not been resolved.
The intermediate module was a clue, not a verdict
The model diagram showed a component between the main control and user interface, described in the discussion as a “key.” One connector was proposed for an isolation test. The source ended before that test produced a documented result, so this page does not call the module defective.
What a return visit should document
Use the exact SHX78CM5N/22 wiring information, inspect every disturbed connector and harness segment, verify supply under load, and compare input and output at each stage of the UI circuit. The final diagnosis was not reported. Even with the same symptom, another unit may have a different cause.