Tuya Backlight or LCD/OLED Display Degradation

Thermostat display is very dim or unreadable, but device still controls heating

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, Loose display connector, Damaged LCD/OLED panel, Low supply voltage to display driver on Tuya PCB

Safety first: Turn off power before opening the thermostat.

Steps to troubleshoot:

Remove the thermostat front cover and inspect the display connector; reseat any ribbon cables firmly.
Check for signs of moisture or corrosion around the display area and clean with isopropyl alcohol.
If the thermostat is powered by 24V, verify correct voltage at the power terminals; low voltage can dim the display.
If the display remains dim or partially unreadable, the display module is likely failing; replace the front display module or the entire thermostat.

Medium 3/5

Display Module (LCD/OLED) for Tuya Smart Thermostat

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