Re: Beko cda 565 fs
The model you have does not have a thermostat but is controlled by a PCB and a small control PCB plus sensors.
If you have replaced the main PCB at the back and the small control PCB and the compressor is not running all the time and cuts out as it should but not reaching temperature.
The most likely fault will be the fridge sensor this is foamed in.
If the compressor is hot and runs all the time then it is a gas or compressor fault if it not reaching temperature.
Bob