First, try 0000 and let me know if that works. If it doesn't, you will need to reset the PIN number.
To reset your PIN on the Samsung SyncMaster 933HD, try the following:
1. Switch your TV onto standby and wait 30 seconds to ensure it is completely off
2. Press the below key sequence in quick succession:
Please note that if your TV comes on during this key sequence, you will need to begin the process again.
3. The PIN code should now be reset to 0000.