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Lennox Y0349 Thermostat Teardown

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Board and LCD - Closer Look

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Now that the board is removed, we see 8 3 volt relays, the temperature and humidity sensor (on it's own board) a small battery, and the microprocessor.

The screen has 3 cables (the wide one is for the LCD, the skinny one if for the digitizer, and the simple, red and black one is for the backlighting.

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