Samsung PN50A650T1FXZC Service Manual page 22

Troubleshooting
4-1-2 Checkpoints by Error Mode
■ No Power
- The LEDs on the front panel do not work when connecting the power cord.
Symptom - The SMPS relay does not work when connecting the power cord.
- The unit appears to be dead.
The SMPS relay or the LEDs on the front panel does not work when connecting the power cord if the cables
are improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:
Major - Check the internal cable connection.
Checklist - Check the fuses.
- Check the output voltages of the SMPS.
- Replace the Main Board.
3
2
1
Troubleshooting
Procedures
4-2
①
Check that the AC power cord is connected
Yes
If LED is set up as being ON when
POWER-ON, check the ligt-on in LED
Yes
②
Is the AC Inlet socket connected?
Yes
③
Check the connection between Fuse FE801
,FB801,FS803 for checking SMPS's Fuse
Yes
④
Check the No. 4 STAND-BY power of
CN801
Yes
⑤
Replace the Main Board
No
Connect the AC power cord
No
Replace Fuse (FE801)
No
Connect AC Inlet socket
No
Replace Fuse
No
Replace the SMPS
4
5
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