Samsung RF4287HAWP - When Refrigerator ROOM Lamp Does Not Light

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TROUBLESHOOTING
4-2-10. When refrigerator ROOM Lamp does not light up
When controlling the regrigerator light with Regulator(12V) : LED LAMP
→ Applying to the FF/FZ/Mid Drawer compartment (Option)
* If the Vegetable Lamp does not work properly, check the FF compartment LED Lamp because it is
connected with the FF compartment LED Lamp in parallel. Refer to the circuit diagram to repair.
Start
Check/Replace REED S/W,
Magnet ASS’Y
Does the
DOOR S/W sense properly?
(Open/Close)
No
Replace/Repair the PCB
No
Replace/Rep air the PCB.
Repair IC76
No
Check the connector terminal
Replace PCB
No
Check the
connector terminal
No
Replace LED LAMP
Normal
1) Measuring IC76 voltage(CN-”3” (Red)/FF LED) Measuring
IC77 voltage(CN78-"1"(Brown)/FZ LED) Measuring
IC78 voltage(CN78-"6"(White-Black)/Mid Drawer LED)
CN76-"12"(Purple) (FF Door Switch) Typical PCB Ground REG1 Heater Sink
FF LED Lamp ON
Close
No
Check the wire
Re-insert the connector
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Is the output
voltage of IC01 MICOM #52
normal?
Is the output
voltage of IC76
normal?
Is the MAIN
PCB connector(CN78) inserted
properly?
Does the MAIN
PCB connector(CN78) output
properly? (11~12V)
Is the LED LAMP
connected properly?
Is the LED LAMP normal?
FF LED Lamp OFF
Open
Door & MICOM State
Door
Close
Open
MICOM(#52)
Right and Left
0V(Low)
5V(High)
MICOM State
Door
(Right and
Left)
Close
Open
FF
#52
0V (Low)
5V (High)
FZ
#53
5V (High)
0V (Low)
Mid Drawer
#51
0V (Low)
5V (High)
IC76(FF)/IC77(FZ)/IC78(Mid Drawer) State
IC76(FF)/IC77(FZ)/IC78(Mid Drawer)
0V(Low)
11~12V(High)
Micom
0V(Low)
5V(High)
AW3 SM-EN 2011.3.31 2:56 PM 페 이 지 9 1 i n