Led Lamp (Option) - Samsung RFG237AA Service Manual

TROUBLESHOOTING

1) LED Lamp (Option)

When controlling the regrigerator light with Regulator(12V) : LED LAMP
→ Applying only to the FF compartment.
* 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.
Door & MICOM State
MICOM(#82)
Door
Right and Left
Close 0V(Low)
Open 5V(High)
MICOM State
R
Door
(Right and Left)
#119
Close
0V (Low) 5V (High)
Open
5V (High)
IC76(R)/IC77(F) State
Micom IC76(R)/IC77(F) output
0V (Low) 0V (Low)
5V (High) 11~13V (High)
☞ Output Voltage Checking Method
- Common Ground REG1 Heater Sink in PCB and
1) Measuring IC76 voltage(CN78-" 4" (Red) / R ROOM LED)
Measuring IC77 voltage(CN78-" 1" (Black) / F ROOM LED)
LED Lamp ON LED Lamp OFF
Does the DOOR S/W
sense properly?
Is the output voltage
F
of IC01 MICOM #119
#122
0V (Low)
Is the output voltage
of IC76 normal?
Is the MAIN PCB
connector(CN78) inserted
Does the MAIN PCB
connector(CN78) output
properly? (11~13V)
Is the LED LAMP connected
Is the LED LAMP normal?
☞ Door Switch voltage Checking Method
- Measuring common Ground REG1 Heater Sink in PCB
Start
No
(Open/Close)
Yes
Check/Replace REED
S/W, Magnet ASS' Y
No
normal?
Yes
No
Replace/Rep air the PCB.
Yes
No
properly?
Yes
Re-insert the connector
No
Yes Check the connector terminal
No
properly?
Yes Check the connector
No
Yes
Normal
and CN30-" 2" (Purple) (R Door Switch)
Close
Open
89
Replace/Repair the
PCB
Repair IC76
Check the wire
Replace PCB
terminal
Replace LED LAMP
Typical PCB Ground REG1 Heater Sink