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TROUBLESHOOTING
4-2-1. Power Not Supplied (SMPS PCB)
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
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
Is soldering short or
cracked on PCB?
No
1) Soldering again
2) Main PCB replacing
No
Checking voltage at
SMPS
- Checking connection of main PCB
- Checking connection between upper hinge
and door
- Checking connection of door panel PCB
Input terminal
Output terminal