Samsung RS257BABB Service Manual 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
� Refer to Circuit Diagram
in this manual or on the
back of the product.
� When the Panel button
does not work
2) When the Panel PCB button does not work
- When the problem is not corrected with the above checking methods
Start
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
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
Is Lock lamp on?
NO
Is a same button kept being
pressed down?
YES
Doesn 't it work even after
PCB mechanical parts are
disassembled?
YES
Does it light up properly
after changing Panel PCB?
NO
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
NO
Insert Connector correctly,
Repair contact error
NO
Insert Main PCB
Connector correctly
NO
Insert Connector correctly,
Repair contact error
YES
Defective Panel PCB
YES
Kept being Check after unlocking the system
pressed
Reassemble PCB Ass'y/
Work after
Ease the button
disassembly
Reassemble PCB Ass'y/
Ease the button
YES
Defective Panel PCB