please help identify the temperature sensor on this PCB
The following 4 principles of temperature sensors are most common: thermistor, thermocouple, resistive temperature detector (RTD), silicon bandgap.


Thermocouple and RTD.  Not visible on the photos.
In addition, they are rarely found in consumer goods that measure around human temperature range.  Thermocouples and RTDs require signal conditioning and excitation circuitry, which increases cost.
prediction: Unlikely
Silicon bandgap temperature sensors are found in consumer goods sometimes.  They are packaged like transistors or ICs.  They may be embedded inside microcontrollers or ASICs.
prediction: Plausible
Thermistor produce a strong signal and don't require much signal conditioning.    It's a cost-effective way of measuring temperature in the human range.  These are used in consumer goods.
prediction: Plausible




Hit with chill spray, see what happens.