No Power (Completely Dead)-Initial Diagnosis (Not Displayed) - Samsung AQ07**SER Series Service Manual

4-3-6 No Power (completely dead)-Initial diagnosis (Not displayed)

1. Checklist :
1) Is input voltage normal?
) Is AC power linked correctly?
3) Is input voltage of DC regulator IC KA7805 (IC0) normal? (11VDC-1.5VDC)
4) Is output voltage of DC regulator IC KA7805 (IC0) normal? (4.5VDC-5.5VDC)
. Troubleshooting procedure
Unplug the power cord and
plug it after 30 seconds
Power Button on the
remote control unit to operate the
Check the indoor unit
 wires of power cord are
connected correctly to the
terminal block and
the fuse on the control board is normal.
FUSE(F701) : T3.15[A]/50[V] or
Check the output of
SMPS on the control board.
Input power: AC30±15%[V]
IC0 Input: DC1[V]
IC0 output: DC5[V]
 Check the setting temperature
4-8
Press the
air conditioner
does not operate
control board
Yes
Check whether
control board.
Yes
Check whether
T.5[A]/50[V]
Yes
Yes
operate
 Check the display board
No
Reconnect wires correctly
No
No
PCB should be replaced
Replace fuse
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