The front panel uses TM1638. The first 4 scan segments are used for the numbers and the colon mark, and the rest is used for the LEDs.

The encoder wheel seems to be wired directly to the MCU with pull-up resistors.

The connection:

 ^ Tab ^
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 1: VCC (5V)

2: EN2 (Encoder Right)

3: EN1 (Encoder Left)

4: GND

5: DIO

6: CLK

7: STB