Main Pba Has No Power Phenomenon - Samsung AM080FX A Series Service Manual

Troubleshooting
4-3 Appropriate Measures for Different Symptom

4-3-2 Main PBA has no power phenomenon

Outdoor unit display
Judgment Method
Connector check
Method
Cause of problem
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 CN70(1pin to 3pin)
connector of the HUB PBA is supplied to
within ± 10%?
Is the HUB PBA LED lighted up?
Is the communication wire of
MAIN/HUB connected?
Replace the MAIN PBA.
Samsung Electronics
Main PBA has no power phenomenon (7-seg does not blink)
Hub PBA power and connection wire to detect.
CN96 on HUB PBA
- 1pin to 4pin : DC 12V
- 9pin to 4pin : DC 5V
∙ HUB PBA connector wire defects and the connection is not.
∙ Main PBA defective.
∙ Hub PBA defective.
∙ High pressure switch operation
∙ Water hub PBA defective. CN96 on HUB PBA
Yes
Yes
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).
Check the short-circuit of HUB PBA.
No
Replace HUB PBA if there is abnormality.
Connect the communication wire to the CN96
No
connector on the HUB PBA.
Replace the EMI PBA.
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