Main Pba Has No Power Phenomenon - Samsung AM072BXV Series Service Manual

Troubleshooting
4-3 Appropriate Measures for Different Symptom

4-3-2 Main PBA has no power phenomenon

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
CN101(AC 220V) on EMI PBA
Method
• MAIN PBA connector wire defects and the connection is not.
Cause of problem • EMI PBA defective.
• High pressure switch operation.
1. Cause of problem
Power On
Did the first EMI PBA Fuse
become short-circuit?
Did the high pressure
switch become short-circuit?
Is the rated
voltage of CN101(1pin to 3pin)
connector of the MAIN PBA is supplied to
within ± 10%?
Replace the MAIN PBA.
Samsung Electronics
Yes
Yes
Yes
Yes
No
No
Check the refrigerant overcharge.
Replace if there is no abnormality.
No
Check the rated input voltage range
on main terminal block. (R/S/T/N).
Replace the EMI PBA.
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