Checkpoints By Error Mode - Samsung PL-42Q91HDP Service Manual

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 units 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:
- Check the internal cable connection status inside the unit.
Major Checklist
- Check the fuses of each part.
- Check the output voltage of SMPS.
- Replace the Main Board.
Troubleshooting
Procedures
4-2
Is the AC IN socket connector and
①
the SMPS CN800 connected?
Yes
Is the Fuse (F801S) of the SMPS
①
Power Input Part blown?
No
SMPS CN801
②
Pin 3 : STB 5V
Pin 2 PS-ON : Check to see if it is 0V
Yes
Replace the Main Board
No
Insert the AC in connector and the
SMPS CN800 connector
Yes
Replace Fuse (F801S)
No
Replace the SMPS
Samsung Electronics