Samsung AM072BXV Series - Main PBA Has no Power Phenomenon

Troubleshooting
Samsung Electronics 81
Outdoor unit display
Main PBA has no power phenomenon (7-seg does not blink)
Judgment Method
Main PBA power and connection wire to defect
Connector check
Method
CN101(AC 220V) on EMI PBA
Cause of problem
• MAIN PBA connector wire defects and the connection is not.
•
EMI PBA defective.
•
High pressure switch operation.
1.
Cause of problem
Replace the MAIN PBA.
Check the refrigerant overcharge.
Replace if there is no abnormality.
Replace the EMI PBA.
No
No
Yes
Yes
Yes
Did the high pressure
switch become short-circuit?
Did the first EMI PBA Fuse
become short-circuit?
Check the rated input voltage range
on main terminal block. (R/S/T/N).
No
Yes
Is the rated
voltage of CN101(1pin to 3pin)
connector of the MAIN PBA is supplied to
within ± 10%?
Power On
4-3 Appropriate Measures for Different Symptom
4-3-2 Main PBA has no power phenomenon