Samsung RF31FM Series Manual page 205

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6. Self Diagnosis & Trouble Shooting
6-12. When refrigerator ROOM Lamp does not light up
1) Measuring output voltage
- Measuring the voltage of PCB typical
Ground J23 JUMMPER and
IC76 voltage( CN78-"3"(Red)/R LED),
IC77 voltage (CN78-"1"(Brown)/F LED)
R LED Lamp ON R LED Lamp OF
Checking method of Door switch voltage.
- Measuring voltage of CN76-"12")(Purple) ↔ PCB typical
Ground J23 JUMMPER
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To do list
PCB Typical Ground
J23 JUMMPER
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