Checkpoints By Error Mode - Samsung PL-42P7HP Service Manual

Troubleshooting

6-2 Checkpoints by Error Mode

6-2-1 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 power of the unit seems to be out of order.
The SMPS relay or the LEDs on the front panel do not work when connecting the power cord if the cables are improperly
connected or the Main Board or SMPS is out of order. 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
6-2
Are the AC IN socket connector and
the Main SMPS CN800 connected?
Yes
Is the Fuse (F801S) of the Main SMPS
Power Input Part blown?
Yes
Main SMPS CN804-1
Pin 3 : STB 5V
Pin 8 PS-ON : Check to see if it is 0V
Yes
Replace the Main Board
No
The AC IN socket connector and
the Main SMPS CN800 connected
No
Replace Fuse (F801S)
No
Replace the Main SMPS
Samsung Electronics