Schneider Electric Display Backlight Power Issue

Thermostat backlight or display is very dim or flickers.

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

Aging LED backlight, Low supply voltage, Failing display driver circuit, Loose connector between display and main board

Safety: Turn off power before removing the thermostat from the wall.

Steps:

Check 24 VAC supply at the thermostat; low voltage can cause dim or unstable backlighting.
Remove the thermostat and gently reseat any ribbon cables or connectors between the display and main PCB.
Update firmware if a known issue with display brightness is documented by Schneider Electric.
If the backlight remains dim or flickers despite correct voltage and connections, the LED backlight or driver circuit is failing; replace the thermostat head unit.

Medium 3/5

Display Module / Backlight Driver

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