When Refrigerator Room Lamp Does Not Light Up - Samsung RF267ABRS Service Manual

TROUBLESHOOTING

4-2-11. When refrigerator ROOM Lamp does not light up

1. When you replace the lamp of freezer, please power OFF to avoid an electric shock.
2. Please keep in mind you could get burnt by the excessive heating of an incandescent light bulb.
3. Bimetal is installed in the refrigerator LAMP. Check that if LAMP may be OFF by bimetal.
※ The case of fresh food compartment(room) lamp will be explained only.
Because it is possible to repair the other room lamps with the same method.
Fresh food compartment
Lamp is applied only.
Door & MICOM State
F
Door MICOM
(#50)
Close
5V(High)
Open
0V(Low)
Reference
* The interior lamp relay operates lighting/lightout
according to door open / close.
* If interior lamp does not light, check the noise of relay
operation.
* Noise of relay operation sounds every Door Open /
Close.
* F-LAMP Relay -- RY75
* R-LAMP Relay -- RY76
Reference
If the door is opened, the contact of door switch will be opened and MICOM will get applied 5V to finally sense Open.
If 5V has been sensed over two minutes afterwards, Door-Open alarm will sound 'Ding-Dong'for 10 seconds in a oneminute cycle. For
that reason, if the door switch has failure, the refrigerator can make a "Ding-Dong"sound per a oneminute cycle. Please note the step
for its service.
☞ When measure lamp resistance to the Wire
→ Resistance can be changed by Lamp input voltage.
(Actual measurement is below, it can be changed by
performance)
R MICOM(#3)
Right and Left
0V(Low)
5V(High)
Check the connection of RDoor
switch and repair the inside lamp
socket
☞ Checking method of Door Switch voltage
- Measuring voltage of Sensor Check Point #5(IC01 MICOM #58) on
PCB or CN30#8(White-black) ↔ CN75#1(Gray)
- Compare time table after measuring
Measuring voltage of CN30#8(white-black)↔CN75#1(Gray) are below
☞ Fresh food
compartment lamp
CN70#1(Red) ↔
CN71#1 (Blue) ;
10(33)Ohm±3 Ohm
Lamp ; 60W + 60W
☞ Fresh food
compartment lamp
CN70#1(Red) ↔
CN71#3 (Gray) ;
15(66)Ohm±5 Ohm
Lamp ; 60W
Start
Is the inside lamp
filament cut?
Is Lamp OFF by
bimetal operating?
Is the connection
point of R-door switch
normal?
Is the control relay
of the inside lamp in PCB
normal?(RY76)
78
Repair the inside lamp
Wait for returning time
of bimetal
Repair door switch
Replace PCB and
Replace Relay
typical PCB Ground CN10#3"(Black)