Fault Diagnosis By Symptom - Samsung AQV12NSA Service Manual

12-2 Fault Diagnosis by Symptom

12-2-1 No Power (completely dead)-Initial diagnosis
1. Checklist :
1) Is input voltage normal?
2) Is AC power linked correctly?
3) Is input voltage of DC regulator IC KA7805 (IC02) normal? (11VDC-12.5VDC)
4) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC)
2. Troubleshooting procedure
Unplug the power cord and
plug it after 30 seconds
Press the
Power Button on the
remote control unit to operate the
air conditioner
Check the indoor unit
control board
Check whether
2 wires of power cord are
connected correctly to the
terminal block and
control board.
Check whether
the fuse on the control board is normal.
FUSE(F701) : T3.15[A]/250[V]
Check the output of
SMPS on the control board.
Input power: AC230±15%[V]
IC02 Input: DC12[V]
IC02 output: DC5[V]
 Check the setting temperature
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operate
does not operate
Yes
Yes
Yes
Yes
Check the display board
No
Reconnect wires correctly
No
Replace fuse
No
PCB should be replaced
12-2