Samsung RB31FEJNB Series Service Manual page 69

4. TROUBLESHOOTING
4-2-6) When there is No Power (MAIN PBA)
Caution
There is AC220~240V or
DC310~340V at the MAIN PCB
Power Circuit. So, be cautious
when repairing the unit or
measuring values.
- Check the connection of Door
Panel PCB
Start
The unit is plugged In?
Yes
220~240V is applied
at MAIN PCB
CN70 #1 and #3?
Yes
MAIN PCB Fuse is blown?
No
DC310~340V is
applied at BD1+/- terminals?
Yes
DC 6.2V is applied at
TOP S/W 267VG 3 - 12?
Yes
DC 12V is applied at
CE109 terminals?
Yes
5V is applied at
CE113 terminals?
Yes
Panel PCB operates normally?
Yes
Loads such as Relay
operate normally?
Yes
Is there PCB Short
or breakage?
No
Normal (Check again)
69
- When checking the MAIN
PCB, refer to the Operation
descriptions and the
"Reference" section.
No
Plug in the unit
No
Check the wire connections
Yes
1) Replace Fuse (AC 250V 2.0A)
2) Replace PCB ASS'Y
No
Replace PCB ASS'Y
No
Replace PCB ASS'Y
No
Replace PCB ASS'Y
No
Replace PCB ASS'Y
No
1) Check the wire connections
2) Replace Panel PCB
No
1) Check Lead Wire connections
2) Replace Relay or PCB ASS'Y
Yes
1) Do Re-soldering
2) Replace PCB MAIN