When Refrigerator Room Lamp Does Not Light Up - Samsung RF28R7201 AA Series Service Manual

TROUBLESHOOTING

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

When controlling the regrigerator light with Regulator(12V) : LED LAMP
→ Applying to the F/R Room compartment (Option)
* If the Vegetable Lamp does not work properly, check the R compartment LED Lamp because it is connected with the R
compartment LED Lamp in parallel. Refer to the circuit diagram to repair.
Door & MICOM State
MICOM(#58)
Door
Right and Left
Close 0V (Low)
Open 5V (High)
MICOM State
FF
Door
#58
Close 0V (Low)
Open 5V (High)
Q408(R)/Q404(F)/IC905 #2(MID) State
IC Q408(R)/Q404(F)/IC905 #2(MID)
0V (Low) 0V(Low)
5V (High) 11~12V(High)
1) Measuring output voltage
- F LED : CN40 "10"(W/RED) and CN40 "12"(GRY)
- R LED : CN40 "26"(RED) and CN40 "28"(GRY)
- MID LED : CN60 "19"(W/RED) and CN40 "22"(W/BLK)
R LED Lamp ON
FZ(MID)
#60(#15)
0V (Low)
5V (High)
R LED Lamp OF
Start
Does
the DOOR S/W sense properly?
(Open/Close)
Yes
Is the
output voltage of IC01 MICOM
#58 normal?
Yes
Is the output voltage of normal?
Yes
Is the
MAIN PCB connector(CN40, CN60)
inserted properly?
Yes
Does
the MAIN PCB connector(CN40, CN60)
output properly? (11~12V)
Yes
Is the LED LAMP
connected properly?
Yes
Is the LED LAMP no mal?
Yes
Normal
Checking method of Door switch voltage.
- Measuring voltage of CN76-"12") (Purple)
↔ PCB typical Ground J23 JUMMPER
Close
92
No
Check/Replace REED S/W,
Magnet ASS`Y
No
Replace/Repair the PCB
No
Replace/Rep air the PCB.
No
Check the wire
Re-insert the connector
No
Check the connector terminal
Replace PCB
No
Check the connector terminal
No
Replace LED LAMP
Open
Repair IC76
PIN Number