82
This document cannot be used without Samsung's authorization
PRECAUTIONS(SAFETY WARNINGS)
4-5-1. Power Not Supplied (SMPS PCB)
Output terminal
1. 12V
2.12V
3. GND
4. GND
5. 5V
Input terminal
Is power plug connected?
Connect the plug, or correct loose plug.
Is normal voltage of 12V
and 5V generated on SMPS
output terminal?
Is operation of panel
PCB normal?
Normal (checking again)
No
PCB assembly replacing.
No
1) Checking and repair of power cable
assembling.
2) Panel PCB replacing.
No
Yes
Yes
Yes
Start
Is soldering short or
cracked on PCB?
No
1) Soldering again.
2) Main PCB replacing.
Yes
Checking voltage at
SMPS
- Checking connection of main PCB
- Checking connection between upper hinge
and door
- Checking connection of door panel PCB
AC input power and high
voltage of DC 310V or higher
are generated at SMPS PCB
and INVERTER PCB power
terminal. Be cautious during
repair and measurement.
CAUTION