4-2-7) When There Is No Power In Main Pcb (Ac Comp) - Samsung RL60GG Series Service Manual

4. TROUBLESHOOTING

4-2-7) When there is no Power in Main PCB (AC Comp)

Caution
There is AC230V or DC310V
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
230V is applied at
SMPS PCB CN70 terminals?
Yes
SMPS PCB Fuse is blown?
No
DC320V is applied at
BD1+/- terminals?
Yes
DC 6.2V is applied at
TOP S/W 245P #3 - #4?
Yes
12V is applied at C110
terminals?
Yes
5V is applied at C113
terminals?
Yes
Panel PCB operates
normally?
Yes
Loads such as Relay
operate normally?
Yes
Is there PCB Short
or breakage?
No
Normal
(Check again)
60
- 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