LG LSC27914SB Owner's Manual - Page 115
V signal, V signal, CON 1, CON 2
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20) Refrigerator apparently doesn't work NO. CHECKING FLOW Check voltage signals of 12 Vdc and 16 Vdc. 6 16 V signal RESULT & SERVICE ACTION 16V signal 12V signal Result Service Action 15.5~16.5 Vdc Go to test 12V signal Other Replace PCB 11.7~ 12.3 Vdc go to Step 7 Other Replace PCB 12 V signal Check 5 V signal voltage. 7 16V signal Result Service Action 4.75~5.25 Vdc Normal, go to Step 8 Other Replace PCB Execute Test Modes anc check voltages in CON 1 and CON 2 as is shown in the pictures. 8 CON 1 CON 2 NOTE: If refrigerator is not starting to cooling after some minutes, refer to Poor Cooling section. Result Service Action TEST MODE 1 CON 1 CON 2 110~127Vac Normal Other Replace PCB 0~5 Vac Normal Other Replace PCB CON 1 TEST MODE 2 CON 2 0~5 Vac Other 110~127Vac Other Normal Replace PCB Normal Replace PCB - 114 -