Main Pcb Has No Power Phenomenon - Samsung AM032MNQDCH/AA Service Manual

Troubleshooting

4-4-2 Main PCB has no power phenomenon

Outdoor unit display Main PCB has no power phenomenon (7-seg does not blink)
Judgment Method Hub PCB power and connection wire to detect.
∙ HUB PCB connector wire defects and the connection is not.
∙ Main PCB defective.
Cause of problem
∙ Hub PCB defective.
∙ High pressure switch operation
1. Cause of problem
Power On
Is a high pressure switch normal?
HUB PCB CN70 AC220V is connected?
Confirm a blinking of Hub PCB LED.
Did you check
the connection status of the Main / Hub connection
Replace Fan PCB
4-46
Yes
Yes
Yes
Yes
wire?
Yes
No
Refrigerant overcharge?
High pressure switch is defective.
No
Check the connection status of EMI PCB.
Check the short circuit of EMI PCB Fuse.
No
Check the short circuit of Hub PCB.
Replace Hub PCB
No
Connecting the communication wire. (CN96)
Samsung Electronics