Samsung RFG297AARS Service Manual page 86

TROUBLESHOOTING
1) LED LAMP
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)
5V(High)
Open
MICOM State
Door(Right and Left) MICOM (#119)
Close 0V (Low)
Open 5V (High)
IC76 State
Micom IC76 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
LED Lamp ON LED Lamp OFF
Start
No
Does the DOOR S/W
sense properly?
(Open/Close)
Yes
Is the output voltage No
of IC01 MICOM #119
normal?
Yes
No
Is the output voltage
of IC76 normal?
Yes
Is the MAIN PCB No
connector(CN78) inserted
properly?
Yes
Does the MAIN PCB No
connector(CN78) output
properly? (11~13V)
Yes
No
Is the LED LAMP connected
properly?
Yes
No
Is the LED LAMP normal?
Yes
Normal
☞ Door Switch voltage Checking Method
- Measuring common Ground REG1 Heater Sink in PCB
and CN30-" 2" (Purple) (R Door Switch)
85
Check/Replace REED
S/W, Magnet ASS' Y
Replace/Repair the
PCB
Replace/Repair the
PCB Repair IC77
Check the wire
Re-insert the connector
Check the connector terminal
Replace PCB
Check the connector
terminal
Replace LED LAMP
Typical PCB Ground REG1 Heater Sink
Close
Open