Mitsubishi Electric Unstable Power Supply to Display

Display flickers or dims while the unit is running.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Loose display PCB connector, failing power supply on main PCB, high load on compressor causing voltage dips, failing display PCB

Safety: Unplug the unit before accessing the control panel.

Steps:

Check power source: Avoid using long or undersized extension cords. Plug directly into a dedicated outlet.
Inspect connectors: Remove the control panel and reseat the connector between the display PCB and main PCB.
Technician: Measure DC supply voltage to the display under load. If it drops significantly, replace the main control PCB. If supply is stable but flicker remains, replace the display PCB.

Medium 3/5

Display PCB / Main Control PCB

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