Samsung RS257BABB Service Guide - Page 46
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Diagnostics 11-2) If the compressor and cooling fan motor don't work normally Start NO Did 5 min pass after COMP. OFF? YES Apply Ref. 7 Does compressor work with forced operation? YES Did buzzer sound on forced operation? (Check certainly after forced start.) NO Apply Ref.4 NO Is MICOM No.28 High?(5V) Check after a lapse of 5 min. Is freezer sensor normal? YES Exchange MICOM and PCB. YES NO Is the voltage of IC03 pin No. 13 between 0-1V? Exchange and repair IC03. YES (ULN2803) Apply Ref. 2 NO Is COMP relay normal? YES NO Is the contact of connector CN70 normal? Is the temp. sense of main PCB Normal? YES Open and troubleshoot the connection. Exchange or troubleshoot COMP relay. NO Open and repair the connection. NO Troubleshoot the sensor and Exchange PCB. YES Is COMP assembly normal? YES Normal Insert connector completely? NO Exchange and repair COMP. assembly. 46