Samsung AM038KXWDCH, Service Manual, Page: 86 / 295

Troubleshooting
Samsung Electronics 83
Outdoor unit display Main PBA has no power phenomenon (7-seg does not blink)
Judgment Method Hub PBA power and connection wire to detect.
Connector check
Method
CN96 on HUB PBA
- 1pin to 4pin : DC 12V
- 9pin to 4pin : DC 5V
Cause of problem
∙ 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
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 CN70(1pin to 3pin)
connector of the HUB PBA is supplied to
within ± 10%?
Check the short-circuit of HUB PBA.
Replace HUB PBA if there is abnormality.
Connect the communication wire to the CN96
connector on the HUB PBA.
No
No
Yes
Yes
Is the HUB PBA LED lighted up?
Is the communication wire of
MAIN/HUB connected?
Power On
4-3 Appropriate Measures for Different Symptom (cont.)
4-3-2 Main PBA has no power phenomenon