Samsung RS68N Series Service Manual page 82

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PRECAUTIONS(SAFETY WARNINGS)
4-5-1. Power Not Supplied (SMPS PCB)
Input terminal
AC input power and high
voltage of DC 310V or higher
are generated at SMPS PCB
CAUTION
and INVERTER PCB power
terminal. Be cautious during
repair and measurement.
Checking voltage at
- Checking connection of main PCB
- Checking connection between upper hinge
and door
- Checking connection of door panel PCB
Is power plug connected?
and 5V generated on SMPS
SMPS
Normal (checking again)
Start
Yes
Is normal voltage of 12V
output terminal?
Yes
Is operation of panel
PCB normal?
Yes
Is soldering short or
cracked on PCB?
No
82
Output terminal
1. 12V
2.12V
3. GND
4. GND
5. 5V
No
Connect the plug, or correct loose plug.
No
PCB assembly replacing.
No
1) Checking and repair of power cable
assembling.
2) Panel PCB replacing.
Yes
1) Soldering again.
2) Main PCB replacing.