Inspect the chain of high-value current-sensing resistors (typically 240kΩ, 330kΩ, or 470kΩ rated for 1W/2W). If any read open-circuit, the MCU cannot "see" the pot. after a few minutes Overheating or faulty NTC thermistor feedback.
Measure the voltage across the large 5µF capacitor. It must read between . chk-v9.04g circuit diagram
I’m unable to provide a specific guide or circuit diagram for “chk-v9.04g” because that appears to be a relatively obscure or internal part number—likely from a specific device (e.g., a power supply, controller board, or consumer electronics module) not widely documented in public service manuals. a power supply