Troubleshooting By Symptom; When There Is No Power At Inverter Pcb (F Room Inverter, Lc3-3A) - Samsung RF32FM SERIES Service Manual

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TROUBLESHOOTING

4-2. Troubleshooting by symptom

4-2-1. When there is no power at Inverter PCB (F Room Inverter, LC3-3A)

Caution
AC120V and DC170V flow
on the Inverter PCB Power
Circuit. Therefore, please be
careful when repairing the
unit or measuring values.
Check with the Inverter
PBA
The voltage checking method
AC120V: CN102 ① ↔ ③
The voltage checking method
DC 13.2V: T ① ↔ ⑥
- Check the Main PCB wires.
- Check the Door Panel PCB
Start
Is the power plug connected?
Yes
Is the CN101, 102 Connector inserted
correctly?
Yes
Has AC 120V been applied to CN102
①-③?
Yes
Is the FUSE on the Inverter PCB
blown?
No.
Has DC 310V applied to both ends of
the BD1+,-?
Yes
Is DC 13.2V applied to C121 or T1⑥-
①?
Yes
Is DC 15V applied to C108?
Yes
Is DC 5V applied to C111?
Yes
Is DC 5V applied to C118?
Yes
Is the Panel PCB working normally?
Yes
Has any of the soldering on the PCB
been short-circuited or open-
circuited?
Yes
Normal (Recheck)
58
- To check the Inverter PCB,
refer to the 'Operations' and
'Refer' sections in this manual
No.
Connect the power plug again and check
if the connection between the power outlet
and the power plug is loose
No.
If the connector is connected incorrectly,
connect it properly (CN101,102)
No.
Check the assembly and wire connections
Yes
Replace Fuse (AC 250V 2.0A)
No.
Replace the Inverter PCB
No.
Replace the Inverter PCB
No.
Replace REG1 (7815)
No.
Replace REG2 (5V LDO)
No.
Replace REG3 (5V LDO)
No.
Check the wire harness
Replace the PANEL PCB
No.
Replace the Inverter PCB