No Power Indoor (Initial Diagnosis) (Not Displayed) - Samsung AQV18UGAX Service Manual

12-2-26.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
Isthe power cable from outdoor is
correct? (L, N
Check the fuse open or not?
(F701,F702)
Restart after power off.
Isthe power normal?
Press the power button on the
display board
Is the DC_link voltage normal?
C102(+) -C101(- ) :270Vdc~320Vdc
Is the SMPS is normal?
IC102 : 12Vdc -GND -5Vdc
Exchange the PBA
-CN71)
YES
YES
YES
YES
YES
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
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