How to know if refrigerator control board is bad involves observing symptoms indicating electronic failure, with signs including refrigerator not cooling at all but compressor not running, display panel blank or flickering, lights not working, buttons not responding, refrigerator running constantly or not running, temperature erratic, defrost system not working causing frost buildup, and error codes on display that do not clear after power cycle. Control board is brain controlling compressor, fans, defrost, and temperature, so if multiple functions fail simultaneously, board likely bad. To diagnose, first unplug fridge for 5 to 10 minutes to reset board, if problem persists, check power to board, inspect board for burn marks, swollen capacitors, or burnt smell. Test voltage output to compressor and fans with multimeter, if no voltage despite power input, board bad. If fridge lights work but compressor not starting and relay good, board failure possible. Technician can test board. So signs of bad control board include no cooling, blank display, unresponsive controls, erratic temperatures, and visible damage on board, with reset not fixing issue.
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