Samsung RS257BABB Service Guide - Page 51

Diagnostics 11-6) If the panel PCB is not working normally: 1) When the entire Panel PCB does not light up or a portion of LCD does not light up Start � Refer to Circuit Diagram in this manual or on the back of the product. � When the Panel button does not work Is the connector of Fre Upp Hinge Cover inserted correctly? YES Is Main PCB Connector (CN50) inserted correctly? YES I s Door Panel PCB Connect or inserted correctly YES Does it light up normally after Panel PCB is replaced? NO NO NO YES Insert Connector correctly, Repair contact error Insert Main PCB Connector correctly Insert Connector correctly, Repair contact error NO 1. F-Door Wire Check -Wi re Cut/Short 2. F-CABI Wire Check -Wire Cut/Short 3. Main PCB Panel Lamp Circuit -Short/Open Check 2) When the Panel PCB button does not work - When the problem is not corrected with the above checking methods Defective Panel PCB Is Lock lamp on? YES NO Kept being pressed Is a same button kept being pressed down? Check after unlocking the system YES Work after Doesn 't it work even after disassembly PCB mechanical parts are disassembled? YES Does it light up properly after changing Panel PCB? YES Reassemble PCB Ass'y/ Ease the button Reassemble PCB Ass'y/ Ease the button NO Defective Panel PCB 1. F-Door Wire Check - Wire Cut/Short 2. F-CABI Wire Check - Wire Cut/Short 3. Main PCB Panel Comm/Power Supply Circuit -Short/Open Check 51