Samsung RT38 Service Manual page 57

TROUBLESHOOTING
4-2-8. When the Room Lamp (LED) does not light up
Door & MICOM State
MICOM(#22)
DOOR S/W
Right
Close
Open 0V(Low)
MICOM State
Door (Fridge)
Close
Open
Q712(R)
Micom CN76 2,4Pin
0V(Low) 0V(Low)
5V(High) 10~12V(High)
5V
R
#22
5V
0V(Low)
Start
DOOR S/W works
normal (Open/Close)
Yes
IC10 MICOM #43 Output
Voltage is normal
Yes
Voltage Output at Pin
#2 & #4 (CN76) is
normal
Yes
Voltage Output at the
MAIN PCB Connector
(CN76) is normal (10~12V)
Yes
The LED Lamp is
connected properly
Yes
The LED Lamp is ok
Yes
Normal
62
No
Check & Replace DOOR S/W
No
Replace / Repair PCB
No
Replace PCB
No
Check Connector Terminal /
Replace PCB
No
Check Connector Terminal
No
Replace LED LAMP