Samsung RF31FM Series Manual page 189

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6. Self Diagnosis & Trouble Shooting
6-6. When Power is not applied
- Check MAIN PCB Wire
- Check DOOR PANEL PCB
YES
IS DC 5V applied to
C111?
YES
IS DC 5V applied to
C118?
YES
Does PANEL PCB work
normal?
YES
Is there any
PCB soldering short
or breakage?
YES
Normal
NO
Replace REG2(5V LDO)
NO
Replace REG3(5V LDO)
NO 1) Check the wire harness
2) Replace PANEL PCB
NO
Replace the Inverter PBA
To do list
189