I have an Lg LMX 25988ST which stopped cooling yesterday. I have no error codes showing. I checked the back circuit boards and notice that the upper PCB assembly circuit board has a clicking sound coming from around the heat sink. The compressor is not running.. I checked the compressor for resistance and was getting 7 ohm. I’m thinking I need to replace the upper PCB, not the main PCB but am not sure and don’t want to spend the money until I get a consensus on this. Thank you for your responses… appreciate it!

The linear compressor system is protected by six protection logic to the best of my knowledge. When a fault is detected, the compressor would be closed down and attempt to restart after some time has passed. The relevant code will flash on the inverter drive PCB's LED to indicate the identified failure. This code will keep sparkling until the unit is unplugged from the power supply. Then there's a graph that shows the flashing times.