Samsung AQ09VFUAGM/CV Service Manual page 94

No power indoor (Initial Diagnosis) (Not displayed)
1.Checklist :
1) Is input power normal?
2) Is AC power linked correctly?
3) Is input voltage of DC_link capacitor normal?
4) Is the voltage of DC regulator normal?
2. Troubleshooting procedure
Unplug the power cord
Is the power cable from outdoor is
correct? (L, N - CN71)
YES
Check the fuse open or not?
(F701,F702)
Restart a er power o .
Is the power normal?
YES
Press the power bu on on the
display board
YES
Is the DC_link voltage normal?
C102(+)-C101(-) :270Vdc~320Vdc
YES
Is the SMPS is normal?
IC102 : 12Vdc-GND-5Vdc
YES
Exchange the PBA
NO
Reconnect the power cord correctly.
NO
Exchange the PBA
Check the power source.
The remote control signal reciever on the display
NO
PBA is wrong
Check the display board
NO
Exchange the PBA
NO
Exchange the PBA