Samsung RF195AC Service Manual page 57

TROUBLESHOOTING
4-2-9. If refrigerator ROOM Lamp does not light up (F,R - Same condition) - LED
1. When you replace the lamp of freezer/fridge, please power OFF
[Explain cold-storage room lamp on the basis of.]
① When lightning of Panel PCB is disabled
Door & MICOM State
Door
Close
Open
MICOM(LAMP) State
Door
Close
Open
MICOM
(#31/ #32)
0V(Low)
5V(High)
☞ Output voltage checking method
-. PCB common Ground REG1 Heater Sink and
CN71-"5"(Pink) : measure the voltage (F LED Lamp)
CN71-"3"(Blue) : measure the voltage (R LED Lamp)
=> Picture is R LED Lamp operation below.
CLOSE
OPEN
☞ Checking method of Door Switch voltage
-. PCB common Ground REG1 Heater Sink and
CN30-"2"(Brown) : measure the voltage (R Door Switch)
CN30-"1"(Black) : measure the voltage (F Door Switch)
=> See the R DOOR Switch at the following picture
CLOSE
OPEN
F R
MICOM(#60) MICOM(#52)
0V(Low) 0V(Low)
5V(High) 5V(High)
F R
MICOM(#31) MICOM(#32)
0V(Low) 0V(Low)
5V(High) 5V(High)
IC71 State
IC71 output
(#15/ #16)
12V(High)
0V(Low)
Common PCB Ground
REG1 Heater Sink
Common PCB Ground
REG1 Heater Sink
Start
Is the Door switch
contact normal?
Yes
Is the output voltage
of IC10 MICOM #32
Normal?
No
Is the output voltage of
IC71 normal?
Yes
Is the main PCB connector(CN71)
insertion status normal?
Yes
Does the main PCB connector(CN71)
Output normal?(11~13V)
Yes
Is the LED Lamp connected
Properly?
Yes
Is the LED Lamp normal?
Yes
Normal / Re-check
57
No
Replace Door S/W
Yes
Replace PCB
No
Replace PCB/ Repair the IC71
No
Re-insert the connector
No
Check the connector terminal
Replace PCB
No
Check the connector terminal
No
Replace LED Lamp